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doi:10.1038/ng.3696 Lyons JJ, Greiner G, Engel N, et al
Common reasons include: Lack of natural oils: Dry skin produces less sebum, reducing protection Environmental factors: Cold weather, low humidity, pollution, and indoor heating Ageing: Ceramide and lipid levels decline with age Poor skincare habits: Over-cleansing, harsh products, hot water Dehydration: Not drinking enough water affects skin from within Because dry skin is both an external and internal issue, it often needs more than just surface-level care
GHK-Cu almost certainly falls under at least two categories: S0 (Non-Approved Substances) because it lacks widespread approval as a human therapeutic drug, and S2 (Peptide Hormones, Growth Factors, Related Substances, and Mimetics) due to its powerful tissue-regenerative and gene-modulating effects
A diet high in sodium