L Carnitine: Benefits, Uses, Side Effects, and More Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Effects of l carnitine Administration on Sperm and Sex Hormone Levels in a Male Wistar Rat Reproductive System Injury Model in a High Altitude Hypobaric Hypoxic Environment Reproductive Sciences Springer Nature Link Nanoparticle mediated L carnitine delivery for improved male fertility ScienceDirect