Acetyl L Carnitine: Boost Focus & Cellular Energy Pro Hormones L Carnitine Supplements (100 Capsules) Health Hispanica Health Hispanica L Carnitine Force Factor L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Unlock Peak Performance & Fertility with L Carnitine! Did you know that injectable L Carnitine is a game changer compared to oral supplements? While oral L Carnitine has low bioavailability (only ~14 18%