L Carnitine Tartrate Supplementation for 5 Weeks Improves Exercise Recovery in Men and Women: A Randomized, Double Blind, Placebo Controlled Trial 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 What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of Effective dosing of L carnitine in the secondary prevention of cardiovascular disease: a systematic review and meta analysis BMC Cardiovascular Disorders Springer Nature Link Exome sequencing identifies primary carnitine deficiency in a family with cardiomyopathy and sudden death European Journal of Human Genetics