The six measurable markers that separate a glycolic acid body lotion that resurfaces skin from one that only softens: named concentration, working pH, barrier support, fragrance-free base, defined mechanism, and traceable manufacture.
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Body skin is not a bigger face. The complete reference on what glycolic acid does below the neck, how to judge a formula, and where the evidence is firm and where it is inference.
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.
Concentration is the headline. pH is the verdict. The quiet number that decides whether a body lotion’s labelled percentage works on skin, and why almost no brand discloses it.