Creatine: Still King. Still Underrated. If there's one supplement that continues to stand the test of time and the research, it's creatine. Benefits? Supports lean muscle mass Improves Nutrition Coach Course Series: Whey, Creatine or Carnitine? TRAINFITNESS Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health L Carnitine and Creatine are both game changers for fitness, but they each shine in different ways! SAVE this as your quick guide! L Carnitine, found in red meat, fish, and chicken, supports fat