Interventions such as L-carnitine, exercise, adequate sleep, and stress limitation can support fertility by improving egg and sperm quality.

“The typical recommendation, based on peer-reviewed studies that have shown significant improvements in egg quality-- that is chromosomal arrangements, that is the likelihood of fertility-- or pregnancy, rather-- the likelihood of sperm being forward fast swimmers as opposed to twitchers or immotile and having proper morphology-- all those measures has been demonstrated to be significantly improved by the ingestion of L-carnitine. How much L-carnitine? Well, that depends on how you're obtaining the L-carnitine. If you're obtaining it in capsule form, 1 to 3 grams per day of capsule form L-carnitine is what's been suggested to improve egg quality and sperm quality.”