Frontiers Antioxidant therapy for infertile couples: a comprehensive review of the current status and consideration of future prospects L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you PCOS is complex but the right supplements can truly make a difference. When it comes to managing PCOS naturally, three supplements stand out for their science backed benefits: 1) Berberine often compared L Carnitine Benefits: A Complete Research Based Guide Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link