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Most users see brighter skin by week 2, thanks to the vitamin C and HA. Collagen takes longer: studies on similar formulas show elasticity up 6 % at four weeks and 14 % at twelve. Gains level off at three months—the natural collagen cycle—so a two-week booster every quarter keeps momentum. Stop altogether and measurements drift back to baseline by month 6. Antioxidant blood scores drop about 18 % after the first course, slowing the yellow tint smokers often develop. For lasers or peels, start three days before treatment to cut redness—tests show healing a full day faster than placebo. Miss more than two weekly doses and collagen markers fall below the “active” range, so consistency matters.