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. Sports Research Magtein Magnesium L Threonate, 2000 mg, 135 Veggie Capsules Costco Nature's Lab One Daily Multivitamin, 120 Vegetarian Capsules Costco Bluebonnet L Carnitine 500 Mg (30 ct) Delivery or Pickup Near Me Instacart