The supplements aisle at Costco is loaded with lots of prodcuts, here's what I think of a few of them. BobbyParrish Facebook The supplements aisle at Costco is loaded with lots of prodcuts, here's what I think of a few of them. Just found this clean pre workout at Costco and its been such a great energy boost before workouts or just powering through a busy day! The @prosupps Mr. Hyde Signature Dual Tub has two flavors in 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, Orange Smash, 16 Oz : Health & Household Forzagen Premium L Carnitina 60 Cpsulas Costco Mxico