        {"id":52898,"date":"2026-10-22T06:59:36","date_gmt":"2026-10-22T04:59:36","guid":{"rendered":"https:\/\/plusbaby.ch\/?post_type=discussion_reelle&#038;p=52898"},"modified":"2026-10-22T06:59:36","modified_gmt":"2026-10-22T04:59:36","slug":"vitamin-d-fertility-switzerland","status":"publish","type":"discussion_reelle","link":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/","title":{"rendered":"Vitamin D Fertility in Switzerland: Why Low Levels Are So Common"},"content":{"rendered":"<p>Clara&#8217;s blood test showed a number she did not expect: 31 nmol\/L. She is 34, works as an architect in St. Gallen and hikes most weekends. She and her partner Luca are trying to have their first baby. Yet her result is very common in Switzerland.<\/p>\n<p>This guide explains vitamin D fertility research in simple terms. As the Swiss Vegan Fertility Leader, Plusbaby wants couples to have clear and honest information before they choose any supplement.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Key_Takeaways\" >Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Why_Low_Levels_Show_Up_in_Swiss_Clinics_Vitamin_D_Deficiency_in_Switzerland\" >Why Low Levels Show Up in Swiss Clinics: Vitamin D Deficiency in Switzerland<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#How_common_low_vitamin_D_is_in_Switzerland\" >How common low vitamin D is in Switzerland<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Limited_sunlight_at_Swiss_latitudes\" >Limited sunlight at Swiss latitudes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Why_food_does_not_fill_the_gap\" >Why food does not fill the gap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Why_some_people_in_Switzerland_have_lower_levels_than_others\" >Why some people in Switzerland have lower levels than others<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Why_couples_trying_to_conceive_are_affected_more\" >Why couples trying to conceive are affected more<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#What_a_Blood_Test_Decides\" >What a Blood Test Decides<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Signs_your_levels_may_be_low\" >Signs your levels may be low<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#The_25OHD_test_and_what_it_measures\" >The 25(OH)D test and what it measures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#What_the_numbers_mean\" >What the numbers mean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#When_to_ask_for_the_test\" >When to ask for the test<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Vitamin_D_Fertility_Research_Ovulation_and_Sperm_Without_a_Cure_Claim\" >Vitamin D Fertility Research: Ovulation and Sperm, Without a Cure Claim<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#What_research_shows_for_women\" >What research shows for women<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#What_research_shows_for_men\" >What research shows for men<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#What_the_evidence_does_not_show\" >What the evidence does not show<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Algae_D3_Versus_Lanolin\" >Algae D3 Versus Lanolin<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Where_most_vitamin_D3_comes_from\" >Where most vitamin D3 comes from<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#How_algae_D3_is_produced\" >How algae D3 is produced<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Is_algae_D3_as_effective\" >Is algae D3 as effective?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#The_Dose_Already_in_Each_Formula\" >The Dose Already in Each Formula<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#How_these_doses_compare_with_Swiss_recommendations\" >How these doses compare with Swiss recommendations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Why_fertility_formulas_keep_vitamin_D_moderate\" >Why fertility formulas keep vitamin D moderate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Checking_your_total_intake\" >Checking your total intake<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#When_a_Doctor_Prescribes_More_Than_a_Multivitamin\" >When a Doctor Prescribes More Than a Multivitamin<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Correcting_a_confirmed_deficiency\" >Correcting a confirmed deficiency<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#PCOS_IVF_and_ICSI_preparation\" >PCOS, IVF and ICSI preparation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Retesting_after_8_to_12_weeks\" >Retesting after 8 to 12 weeks<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Scientific_References_Studies\" >Scientific References &amp; Studies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#FAQs\" >FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>About half of the Swiss population has low vitamin D, and many people stay low all year.<\/li>\n<li>A 25(OH)D blood test is the only reliable way to know your level.<\/li>\n<li>Research links adequate vitamin D with healthy ovarian function and sperm motility. Vitamin D is not a fertility treatment.<\/li>\n<li>Algae vitamin D3 and lanolin vitamin D3 are the same molecule. Algae D3 is suitable for vegans.<\/li>\n<li>A multivitamin supports maintenance. A confirmed deficiency needs a doctor&#8217;s plan.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Why_Low_Levels_Show_Up_in_Swiss_Clinics_Vitamin_D_Deficiency_in_Switzerland\"><\/span>Why Low Levels Show Up in Swiss Clinics: Vitamin D Deficiency in Switzerland<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"How_common_low_vitamin_D_is_in_Switzerland\"><\/span>How common low vitamin D is in Switzerland<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The data on vitamin D deficiency in Switzerland is clear. The<a href=\"https:\/\/www.eek.admin.ch\/eek\/de\/home\/pub\/vitamin-d-mangel.html\" target=\"_blank\" rel=\"noopener\"> Federal Commission for Nutrition (FCN)<\/a> estimates that about 50% of the Swiss population has low levels.<\/p>\n<p>A <a href=\"https:\/\/smw.ch\/index.php\/smw\/article\/view\/2799\" target=\"_blank\" rel=\"noopener\">study of pregnant women in Bern<\/a> found that 73% had levels below 50 nmol\/L. For many Swiss women, a low result is the norm.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Limited_sunlight_at_Swiss_latitudes\"><\/span>Limited sunlight at Swiss latitudes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>At Swiss latitudes, useful UVB light is available for only part of the year. Indoor work and sunscreen reduce it further, so many people never build full stores.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_food_does_not_fill_the_gap\"><\/span>Why food does not fill the gap<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Few foods contain much vitamin D. Even the <a href=\"https:\/\/plusbaby.ch\/en\/blog\/fertility-diet-foods-to-eat-when-trying-to-conceive\/\">best foods to eat when trying to conceive<\/a> provide only small amounts. Food fortification is limited in Switzerland. On a vegan diet, natural sources are almost absent.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_some_people_in_Switzerland_have_lower_levels_than_others\"><\/span>Why some people in Switzerland have lower levels than others<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Some factors lower levels further:<\/p>\n<ul>\n<li>Indoor work during daylight hours<\/li>\n<li>Darker skin, which needs more UVB to make vitamin D<\/li>\n<li>Clothing that covers most of the skin<\/li>\n<li>Regular sunscreen use (still important for skin health)<\/li>\n<li>A higher BMI, because body fat stores vitamin D<\/li>\n<li>A vegan or plant based diet<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Why_couples_trying_to_conceive_are_affected_more\"><\/span>Why couples trying to conceive are affected more<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Many couples begin trying without knowing their vitamin D level. Women need vitamin D for ovulation and pregnancy. Men need it for sperm health. So vitamin D conception planning is one reason <a href=\"https:\/\/plusbaby.ch\/en\/blog\/why-both-partners-should-take-fertility-supplements-switzerland\/\">why both partners should take fertility supplements<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_a_Blood_Test_Decides\"><\/span>What a Blood Test Decides<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Signs_your_levels_may_be_low\"><\/span>Signs your levels may be low<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Low vitamin D can cause tiredness, low mood or muscle aches. Many people feel fine, like Clara. A blood test matters more than symptoms.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_25OHD_test_and_what_it_measures\"><\/span>The 25(OH)D test and what it measures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The test measures 25 hydroxyvitamin D, the main storage form of vitamin D in your blood.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_the_numbers_mean\"><\/span>What the numbers mean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Vitamin D blood levels explained<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>25(OH)D level (nmol\/L)<\/b><\/td>\n<td><b>25(OH)D level (ng\/mL)<\/b><\/td>\n<td><b>What it usually means<\/b><\/td>\n<\/tr>\n<tr>\n<td>Below 25<\/td>\n<td>Below 10<\/td>\n<td>Severe deficiency<\/td>\n<\/tr>\n<tr>\n<td>25 to 49<\/td>\n<td>10 to 19<\/td>\n<td>Deficiency<\/td>\n<\/tr>\n<tr>\n<td>50 to 74<\/td>\n<td>20 to 29<\/td>\n<td>Adequate for most adults<\/td>\n<\/tr>\n<tr>\n<td>75 and above<\/td>\n<td>30 and above<\/td>\n<td>Target level used by many doctors<\/td>\n<\/tr>\n<tr>\n<td>Above 250<\/td>\n<td>Above 100<\/td>\n<td>Too high, with a risk of side effects<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"When_to_ask_for_the_test\"><\/span>When to ask for the test<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ask your gynaecologist or GP as part of a <a href=\"https:\/\/plusbaby.ch\/en\/blog\/3-month-preconception-plan-couples-switzerland\/\">3 month preconception plan for couples<\/a> if you plan a pregnancy, especially with a risk factor above. Basic insurance in Switzerland usually covers the test when your doctor gives a medical reason.<\/p>\n<p>Luca asked his GP for the same test. His level was also low.<\/p>\n<div class=\"gradient-cta\" style=\"padding: 10px; border: 1px solid #000;\">\n<p><strong>Preparing for pregnancy as a couple?<\/strong><\/p>\n<p>Vitamin D matters for both partners. +fertiwomen Inositol and +fertimen are Swiss doctor formulated and 100% vegan.<\/p>\n<p>Each contains algae vitamin D3 at a daily maintenance dose, plus Quatrefolic\u00ae active folate.<\/p>\n<p><a href=\"https:\/\/plusbaby.ch\/en\/shop\/\">Discover the +fertiwomen Inositol and +fertimen packs<\/a><\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Vitamin_D_Fertility_Research_Ovulation_and_Sperm_Without_a_Cure_Claim\"><\/span>Vitamin D Fertility Research: Ovulation and Sperm, Without a Cure Claim<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_research_shows_for_women\"><\/span>What research shows for women<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Studies link adequate vitamin D with healthy ovarian function and a healthy endometrium. A 2018 meta analysis in Human Reproduction looked at women in IVF and ICSI. Women with adequate vitamin D had higher live birth rates than women with deficiency. This is an association, not proof of cause.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_research_shows_for_men\"><\/span>What research shows for men<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vitamin D receptors are also present in sperm cells. A Danish study found that men with very low vitamin D had fewer motile sperm. This is why many <a href=\"https:\/\/plusbaby.ch\/en\/product\/plusfertimen\/\">sperm motility supplements in Switzerland<\/a> include vitamin D3.<\/p>\n<p>Vitamin D is only one factor. See our guide on<a href=\"https:\/\/plusbaby.ch\/en\/blog\/low-sperm-count-causes-tests-natural-solutions\/\"> low sperm count causes, tests and natural solutions<\/a>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_the_evidence_does_not_show\"><\/span>What the evidence does not show<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Supplement trials on pregnancy rates show mixed results. Vitamin D cannot replace a medical assessment. Vitamin D fertility research supports adequate levels. It does not support very high doses.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Algae_D3_Versus_Lanolin\"><\/span>Algae D3 Versus Lanolin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Where_most_vitamin_D3_comes_from\"><\/span>Where most vitamin D3 comes from<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Most vitamin D3 supplements use lanolin, a fat from sheep&#8217;s wool. It is not suitable for a vegan diet.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_algae_D3_is_produced\"><\/span>How algae D3 is produced<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Certain microalgae produce vitamin D3 naturally. It is extracted and purified, so the result is fully plant based. This makes algae vitamin D3 fertility support possible for vegan couples.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_algae_D3_as_effective\"><\/span>Is algae D3 as effective?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Algae D3 and lanolin D3 are the same molecule, cholecalciferol. Only the source is different. This matters for couples who look for <a href=\"https:\/\/plusbaby.ch\/en\/product\/plusfertiwomen\/\">vegan fertility vitamins in Switzerland<\/a>.<\/p>\n<p>Clara eats mostly plant based, so she chose an algae vitamin D3 fertility option.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Dose_Already_in_Each_Formula\"><\/span>The Dose Already in Each Formula<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>All three Plusbaby formulas are Swiss doctor formulated, vegan and made under GMP and ISO standards. They use high bioavailability forms such as Quatrefolic\u00ae folate and bisglycinate iron.<\/p>\n<p><strong>Vitamin D3 in Plusbaby formulas<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Product<\/b><\/td>\n<td><b>Vitamin D3 per daily dose (2 capsules)<\/b><\/td>\n<td><b>Source<\/b><\/td>\n<td><b>Life stage<\/b><\/td>\n<\/tr>\n<tr>\n<td>+fertiwomen Inositol<\/td>\n<td>5 \u00b5g (200 IU)<\/td>\n<td>Algae<\/td>\n<td>Preconception, women<\/td>\n<\/tr>\n<tr>\n<td>+fertimen<\/td>\n<td>5 \u00b5g (200 IU)<\/td>\n<td>Algae<\/td>\n<td>Preconception, men<\/td>\n<\/tr>\n<tr>\n<td>+mum<\/td>\n<td>25 \u00b5g (1,000 IU)<\/td>\n<td>Algae<\/td>\n<td>Pregnancy and breastfeeding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"How_these_doses_compare_with_Swiss_recommendations\"><\/span>How these doses compare with Swiss recommendations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The FCN recommends 600 IU (15 \u00b5g) per day for adults, including pregnant women. +fertiwomen Inositol and +fertimen provide 200 IU. The rest can come from sunlight, food or a separate supplement your doctor advises. +mum provides 1,000 IU.<\/p>\n<p>This is well below the upper safe limit of 4,000 IU per day for adults. If you compare <a href=\"https:\/\/plusbaby.ch\/en\/product\/plusmum\/\">prenatal vitamins in Switzerland<\/a>, always check the vitamin D dose on the label.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_fertility_formulas_keep_vitamin_D_moderate\"><\/span>Why fertility formulas keep vitamin D moderate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vitamin D is fat soluble, so very high intake over time can raise calcium levels too much. This is why many women fertility vitamins in Switzerland use maintenance doses.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Checking_your_total_intake\"><\/span>Checking your total intake<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Count every source and tell your doctor what you take.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"When_a_Doctor_Prescribes_More_Than_a_Multivitamin\"><\/span>When a Doctor Prescribes More Than a Multivitamin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Correcting_a_confirmed_deficiency\"><\/span>Correcting a confirmed deficiency<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Clara&#8217;s level was 31 nmol\/L. Her gynaecologist prescribed a higher dose for a limited period. Do not start high doses without medical advice. Vitamin D deficiency Switzerland guidelines recommend treatment under medical supervision.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"PCOS_IVF_and_ICSI_preparation\"><\/span>PCOS, IVF and ICSI preparation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Women with PCOS often have lower vitamin D levels.<\/p>\n<p>Read our comparison of <a href=\"https:\/\/plusbaby.ch\/en\/blog\/myo-inositol-vs-metformin-pcos-switzerland\/\">myo inositol vs metformin for PCOS<\/a>. Swiss clinics may test it before IVF or ICSI.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Retesting_after_8_to_12_weeks\"><\/span>Retesting after 8 to 12 weeks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A second test after 8 to 12 weeks shows if the plan works. Clara&#8217;s second test showed 68 nmol\/L. She then continued with +fertiwomen Inositol for maintenance, and Luca took +fertimen.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Scientific_References_Studies\"><\/span>Scientific References &amp; Studies<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>Christoph P, et al. High prevalence of severe vitamin D deficiency during the first trimester in pregnant women in Switzerland and its potential contributions to adverse outcomes in the pregnancy. Swiss Medical Weekly, 2020;150:w20238.<a href=\"https:\/\/smw.ch\/index.php\/smw\/article\/view\/2799\" target=\"_blank\" rel=\"noopener\"> smw.ch\/index.php\/smw\/article\/view\/2799<\/a><\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Clara&#8217;s story is common. Limited sunlight, indoor lifestyles, and few food sources explain why vitamin D deficiency Switzerland figures stay high. A simple blood test gives a clear answer, and your doctor can choose the right dose. Vitamin D fertility research supports adequate levels for both partners.<\/p>\n<p>It does not promise a pregnancy. Good vitamin D conception planning starts with a test, not a guess.<\/p>\n<p>As the Swiss Vegan Fertility Leader, Plusbaby supports this step with vegan formulas and honest dose information.<\/p>\n<div class=\"gradient-cta\" style=\"padding: 10px; border: 1px solid #000;\">\n<p><strong>Your next step: test, then support<\/strong><\/p>\n<p>Ask your doctor for a 25(OH)D test before you plan your supplements.<\/p>\n<p>For daily maintenance, +fertiwomen Inositol and +fertimen provide algae vitamin D3 with Quatrefolic\u00ae active folate for both partners.<\/p>\n<p>After a positive pregnancy test, +mum continues with 1,000 IU of algae vitamin D3 and gentle bisglycinate iron.<\/p>\n<p><a href=\"https:\/\/plusbaby.ch\/en\/product\/plusfertiwomen\/\">Explore +fertiwomen Inositol<\/a> | <a href=\"https:\/\/plusbaby.ch\/en\/product\/plusfertimen\/\">Explore +fertimen<\/a> | <a href=\"https:\/\/plusbaby.ch\/en\/product\/plusmum\/\">Explore +mum<\/a><\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Question: Does low vitamin D stop you from getting pregnant?<\/strong><br \/>\n<strong>Answer<\/strong>: Low vitamin D is rarely the only cause of difficulty getting pregnant. Studies link low levels with lower live birth rates in IVF and ICSI. However, many factors affect fertility, including age, ovulation, sperm quality and thyroid health. A full assessment of both partners by your doctor comes first. Correcting a low level is then one useful step.<\/p>\n<p><strong>Question: Should my partner also take vitamin D?<\/strong><br \/>\n<strong>Answer<\/strong>: Yes, if his level is low. Men in Switzerland have the same risk factors as women. Vitamin D plays a role in sperm motility and testosterone. Sperm take about 74 days to develop, so it is best to start early. Vitamin D conception planning works best when both partners test their levels.<\/p>\n<p><strong>Question: Is algae vitamin D3 good for fertility?<\/strong><br \/>\n<strong>Answer<\/strong>: Yes. Algae vitamin D3 is cholecalciferol, the same molecule as lanolin vitamin D3. Only the source is different. This makes algae vitamin D3 fertility support a suitable choice for vegan and vegetarian couples.<\/p>\n<p><strong>Question: Can I take +fertiwomen Inositol with a separate vitamin D supplement?<\/strong><br \/>\n<strong>Answer<\/strong>: Yes, if your doctor recommends it. +fertiwomen Inositol provides 200 IU per day. Add this to any vitamin D drops or tablets you take. Share your full list with your doctor to keep your intake safe.<\/p>\n<p><strong>Question: Is sunlight enough to keep my vitamin D level normal?<\/strong><br \/>\n<strong>Answer<\/strong>: For some people, regular sunlight is enough for part of the year. People with risk factors often need a supplement all year. This includes people with darker skin, indoor work or a vegan diet. A blood test is the only way to know your own level.<\/p>\n<p><em>Note: Plusbaby resources provide general information. They do not replace professional medical advice, diagnosis or treatment.<\/em><\/p>\n","protected":false},"author":1,"featured_media":52899,"parent":0,"menu_order":0,"template":"","tags":[266,285],"categories":[310,365],"class_list":["post-52898","discussion_reelle","type-discussion_reelle","status-publish","has-post-thumbnail","hentry","tag-sex","tag-your-health","categories-sex","categories-your-health"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.7-RC2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Vitamin D Fertility in Switzerland: Why Levels Are Low<\/title>\n<meta name=\"description\" content=\"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vitamin D Fertility in Switzerland: Why Low Levels Are So Common\" \/>\n<meta property=\"og:description\" content=\"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/\" \/>\n<meta property=\"og:site_name\" content=\"PlusBaby\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/plusbaby.ch\" \/>\n<meta property=\"og:image\" content=\"https:\/\/plusbaby.ch\/wp-content\/uploads\/2026\/10\/vitamin-d-fertility-switzerland.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1071\" \/>\n\t<meta property=\"og:image:height\" content=\"527\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/\",\"url\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/\",\"name\":\"Vitamin D Fertility in Switzerland: Why Levels Are Low\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/plusbaby.ch\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/vitamin-d-fertility-switzerland.webp\",\"datePublished\":\"2026-10-22T04:59:36+00:00\",\"description\":\"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/#primaryimage\",\"url\":\"https:\\\/\\\/plusbaby.ch\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/vitamin-d-fertility-switzerland.webp\",\"contentUrl\":\"https:\\\/\\\/plusbaby.ch\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/vitamin-d-fertility-switzerland.webp\",\"width\":1071,\"height\":527,\"caption\":\"Vitamin D fertility support for couples in Switzerland\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/blog\\\/vitamin-d-fertility-switzerland\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Vitamin D Fertility in Switzerland: Why Low Levels Are So Common\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/\",\"name\":\"Plusbaby\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#organization\",\"name\":\"Plusbaby\",\"url\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/plusbaby.ch\\\/wp-content\\\/uploads\\\/2022\\\/04\\\/plus-baby-logo.svg\",\"contentUrl\":\"https:\\\/\\\/plusbaby.ch\\\/wp-content\\\/uploads\\\/2022\\\/04\\\/plus-baby-logo.svg\",\"width\":202,\"height\":82,\"caption\":\"Plusbaby\"},\"image\":{\"@id\":\"https:\\\/\\\/plusbaby.ch\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/plusbaby.ch\",\"https:\\\/\\\/www.instagram.com\\\/plusbaby.ch\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/plusbaby\\\/?viewAsMember=true\",\"https:\\\/\\\/www.instagram.com\\\/plusbaby_ge\"]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Vitamin D Fertility in Switzerland: Why Levels Are Low","description":"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/","og_locale":"en_US","og_type":"article","og_title":"Vitamin D Fertility in Switzerland: Why Low Levels Are So Common","og_description":"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.","og_url":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/","og_site_name":"PlusBaby","article_publisher":"https:\/\/www.facebook.com\/plusbaby.ch","og_image":[{"width":1071,"height":527,"url":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2026\/10\/vitamin-d-fertility-switzerland.webp","type":"image\/webp"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/","url":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/","name":"Vitamin D Fertility in Switzerland: Why Levels Are Low","isPartOf":{"@id":"https:\/\/plusbaby.ch\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#primaryimage"},"image":{"@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#primaryimage"},"thumbnailUrl":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2026\/10\/vitamin-d-fertility-switzerland.webp","datePublished":"2026-10-22T04:59:36+00:00","description":"Vitamin D fertility guide for Switzerland: why low levels are common, what a blood test shows, and how algae vitamin D3 supports vegan couples.","breadcrumb":{"@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#primaryimage","url":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2026\/10\/vitamin-d-fertility-switzerland.webp","contentUrl":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2026\/10\/vitamin-d-fertility-switzerland.webp","width":1071,"height":527,"caption":"Vitamin D fertility support for couples in Switzerland"},{"@type":"BreadcrumbList","@id":"https:\/\/plusbaby.ch\/en\/blog\/vitamin-d-fertility-switzerland\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/plusbaby.ch\/en\/"},{"@type":"ListItem","position":2,"name":"Vitamin D Fertility in Switzerland: Why Low Levels Are So Common"}]},{"@type":"WebSite","@id":"https:\/\/plusbaby.ch\/en\/#website","url":"https:\/\/plusbaby.ch\/en\/","name":"Plusbaby","description":"","publisher":{"@id":"https:\/\/plusbaby.ch\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/plusbaby.ch\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/plusbaby.ch\/en\/#organization","name":"Plusbaby","url":"https:\/\/plusbaby.ch\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/plusbaby.ch\/en\/#\/schema\/logo\/image\/","url":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2022\/04\/plus-baby-logo.svg","contentUrl":"https:\/\/plusbaby.ch\/wp-content\/uploads\/2022\/04\/plus-baby-logo.svg","width":202,"height":82,"caption":"Plusbaby"},"image":{"@id":"https:\/\/plusbaby.ch\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/plusbaby.ch","https:\/\/www.instagram.com\/plusbaby.ch\/","https:\/\/www.linkedin.com\/company\/plusbaby\/?viewAsMember=true","https:\/\/www.instagram.com\/plusbaby_ge"]}]}},"_links":{"self":[{"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/discussion_reelle\/52898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/discussion_reelle"}],"about":[{"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/types\/discussion_reelle"}],"author":[{"embeddable":true,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":2,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/discussion_reelle\/52898\/revisions"}],"predecessor-version":[{"id":52913,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/discussion_reelle\/52898\/revisions\/52913"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/media\/52899"}],"wp:attachment":[{"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/media?parent=52898"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/tags?post=52898"},{"taxonomy":"categories","embeddable":true,"href":"https:\/\/plusbaby.ch\/en\/wp-json\/wp\/v2\/categories?post=52898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}