Glycine Propionyl L Carnitine & ED : Benefits, Effects & Uses Allo Health Blog 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 for Cutting vs Bulking: How It Works in Both Phases L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar