Every viral body acid spawns a hundred cheaper lookalikes. Most copy the number on the bottle and little else. Here is the four-part test that separates a genuine equivalent from a near miss, and why the headline percentage was never the whole story.
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wo body lotions can carry the same glycolic acid percentage and behave nothing alike. The reason is a number almost no label prints, and it is the one that matters most.
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Why two lotions with identical label percentages can deliver entirely different results, and the formulation principle that distinguishes them.