L carnitine: Health Benefits, Side Effects, Uses, Dose & Precautions Nature's Bounty, L Carnitine Caplets, 500 mg, Heart Health Support Walmart.com If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. L Carnitine Tartrate Supplementation for 5 Weeks Improves Exercise Recovery in Men and Women: A Randomized, Double Blind, Placebo Controlled Trial L Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap)