The supplements aisle at Costco is loaded with lots of prodcuts, here's what I think of a few of them. Amazon.com: Ronnie Coleman Signature Series L Carnitine XS 3000 Liquid, Amino Acids Metabolism and Lean Muscle Strength Support, Stimulant Free, Sugar Free, Zero Carbs, Blue Razz, 16 Oz : Health & Household Kirkland Signature CoQ10 300 mg., 100 Softgels Costco Nutrex Research L Carnitine 3000 Premium L Carnitine Liquid Shots Stimulant Free Workout Drink Transforms Fat Into Energy and Supports Muscle Recovery For Men and Women 31 Serv (Berry Blast) Walmart.com