The Benefits (and Limitations) of L Carnitine for Fat Loss Amazon.com: Nutrex Research L Carnitine 3000 (31 Servings, Berry Blast) Liquid Shots, Stimulant Free Supports Muscle Recovery For Men and Women : Health & Household 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 L Carnitine Benefits (Simple + Shareable) 1. Fat Energy conversion * Helps transport fat into cells to be burned as energy * This is its main biological role 2. May support Beneficial effects of l carnitine supplementation for weight management in overweight and obese adults: An updated systematic review and dose response meta analysis of randomized controlled trials ScienceDirect