How to Take L Carnitine Correctly to Boost Your Training Healthfarm Healthfarm Nutrition Parker Naturals Concentrated L Carnitine Liquid, 5000mg All Natural Citrus Flavored L Carnitine Supplement, Liquid L Carnitine with Vitamin V5, 16.23 L Carnitine Supplement Bodybuilding.com Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window