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 Does Costco Sell L Carnitine 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 The supplements aisle at Costco is loaded with lots of prodcuts, here's what I think of a few of them.