L-Carnitine : 200 mg

Carnitine is present in very high concentrations in the epididymides, which store and transport sperm. Carnitine could protect spermatozoa from oxidative damage and could therefore improve sperm quality. The results of a study involving 52 men with idiopathic infertility confirm this hypothesis: the subjects were divided into two groups and given either clomiphene (an anti-oestrogenic drug) or 2g of L-carnitine a day for three months. Both substances increased sperm count and motility.
Moradi M. Safety and efficacy of clomiphene citrate and L-carnitine in idiopathic male infertility. Urol J 2010; 7(3):188-93.