Busetto GM, et al. - This trial was undertaken in order to examine the effect of 6 months of supplementation with l-carnitine, acetyl-l-carnitine and other micronutrients on sperm quality in individuals with oligo- and/or astheno- and/or teratozoospermia with or without varicocele. Researchers drew the conclusion that, in order to improve fertility, supplementation with metabolic and antioxidant compounds could be efficacious when included in strategies.