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Compare Weekly vs Twice‑Weekly Glycolic Acid, Skincare Routine Wins
Compare Weekly vs Twice-Weekly Glycolic Acid, Skincare Routine Wins A randomized controlled trial with 120 women found 28% greater collagen firmness after just 3 months of weekly 1% glycolic acid, but 2-frequency packs slowed aging by 12% more. In short, using glycolic acid once a week delivers stronger firmness gains