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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Walk into any beauty retailer and you will find glycolic acid body lotions ranging from 2% to 15% — all making similar claims. The percentage on the label is the single variable that separates a product that visibly transforms rough skin, KP and strawberry legs from one that simply moisturises. This is the clinical evidence behind why 12% is the standard that actually works.