PLOD1 and Infertility: Another study done by Hadi et al supplemented L-carnitine 2 grams daily in 58 infertile men for 3 months and found that L-carnitine increased sperm count, normal morphology and motility overall, elevated testosterone and inhibin levels, and decreased LH and FSH levels while L-carnitine when given in combination with other supplements by Nazari et al in 180 infertile men with idiopathic OAT led to improvement in sperm morphology and sperm concentration but sperm motility did not alter [30,31].