Carlyle GPLC Glycine Propionyl L Carnitine HCL Supplement 1250mg 60 Capsules Advanced Athlete Formula Non GMO Gluten Swanson Vitamins Propionyl L Carnitine HCl & Glycine Support Your dog's heart works hard and L Carnitine helps fuel every beat. This natural protein like substance supports healthy heart function by helping carry fatty acids to where the body needs them most. When to Take L Carnitine for Optimal Training Benefits Transparent Labs Benefits of Acetyl L Carnitine Simply Supplements