doi: 10.1164/RCCM.2112074 80 GvozdjkovAKucharskJBartkovjakovMGazdkovKGazdkF
Retinol mechanisms: Increases cell turnover (sheds dead skin cells faster) Stimulates collagen production in dermis Reduces breakdown of existing collagen Unclogs pores and reduces acne Fades hyperpigmentation and sun damage Thickens epidermis over time Timeline for results: 4-6 weeks: Smoother texture, reduced breakouts 8-12 weeks: Visible reduction in fine lines 6-12 months: Significant improvement in wrinkles, firmness, tone Trade-off: Retinol can cause irritation, dryness, redness, and peeling, especially when starting or using high concentrations
To view a copy of this licence, visit About this article Cite this article Cao, J., Belousoff, M.J., Johnson, R.M
Regulatory status: Neither peptide is FDA-approved, and both are banned for competitive athletes by WADA
George A, Pushkaran S, Konstantinidis DG, Koochaki S, Malik P, Mohandas N, et al