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Short YouTube excerpt (Dr. Charles Mok) explaining anti-aging skincare ingredients. The speaker contrasts retinoid forms—tretinol (described as a strong form of vitamin A), retinoic acid, retinaldehyde, and retinol/alcohol forms—noting that retinol and the alcohol forms are most suitable and generally well tolerated but can cause dryness (less so than acid forms). The clip also names a glycolic (alpha-hydroxy) moisturizer as the most common anti-aging cream.










