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. Biotech USA L Carnitine 1000 L Carnitine: Benefits, Risks, and Its Role in Fitness and Weight Loss WellnessPulse Potential Adverse Effects of L Carnitine Marnys 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