Skincare marketing implies fast results because slow results don't sell. The biology of skin (cell turnover, collagen synthesis, pigment dispersion) takes weeks regardless of product price. Realistic timelines are slower than the marketing.
What real timelines look like
Retinoid: 4 weeks for skin texture, 8-12 weeks for fine lines, 6+ months for collagen-driven firmness. Vitamin C: 6-8 weeks for brightness, 12+ weeks for hyperpigmentation reduction. Acid exfoliation: 2-3 weeks for surface smoothness, 8-12 weeks for tone evenness. Tranexamic acid: 12-16 weeks for melasma fade.
Why fast 'results' usually aren't real change
Surface hydration is the fast effect that masks longer-term action. Skin looks plumper from hydration within hours; underlying changes take weeks. Marketers sell the fast cosmetic effect as 'proof' the product works.
Commit to 12 weeks before judging a product. Most fail not because they don't work but because users abandon them before they could.