Creatine vs L Carnitine: Which Supplement Fits Your Goals? Creatine Monohydrate Gummies Performance Inspired Nutrition Creatine monohydrate and L carnitine are two of the most researched supplements in the game., We are talking years. Decades. Proven over and over again., Creatine is your foundation., More strength. Combinations that Work: HMB & Isometric Training for Lean Mass, Creatine & Powerlifting for Leaning Out and Carnitine & Bodybuilding for Powerlifting?