Carnicor: Uses, Dosage & Side Effect MIMS Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link L carnitine is effective for both fat loss and athletic performance. However, oral L carnitine has lower bioavailability and can be harmful at high doses, so it should be avoided. Even cardiologists give IV L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage Fertility Supplements: Best Options for Men and Women (Evidence Based Guide) Female Infertility: Causes, Treatments and Nutrients Life Extension