Third-party testing means an independent laboratory — with no financial ties to the supplement company — analyzes the finished product to verify that the label matches the contents, that no banned substances or contaminants are present, and that the product meets safety standards. It's the difference between a brand saying "trust us" and an independent authority saying "we verified it." Do Vitamins tests every batch of PurePump through BSCG (Banned Substance Control Group), one of the world's most rigorous third-party certification programs, screening for 500+ substances using the same analytical methods as Olympic drug testing labs.

A proprietary blend is a group of ingredients listed on a supplement label under a single name with only the total combined weight disclosed — not the individual dose of each ingredient. You know what's in the product, but you have no idea how much of each ingredient you're actually getting. It's legal, it's widespread, and it's the single biggest obstacle to making an informed supplement purchase. Do Vitamins has never used a proprietary blend and never will — every ingredient and every dose in PurePump is fully disclosed on the label.