The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link Everything You Need to Know About Acetyl L Carnitine Swanson Vitamins Supplement Spotlight: L Carnitine, A go to for weight loss and a strong ally in muscle hypertrophy. If youre serious about leaning out and building up, this ones worth a look., Watch the video for L Carnitine and Sleep: Does It Affect Rest or Sleep Quality? L Carnitine has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years.,