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Oncoimmunology 10 (1), 1957605
What Retinol Actually Is and How It Works Retinol is a vitamin A derivative that the skin converts enzymatically, first to retinaldehyde, then to retinoic acid, which is the biologically active form
When it binds to copper (II) ions, it forms the GHK-Cu complex, which is the biologically active form
Hair also looked healthier, with a 27.6% increase in total hair and a 31.9% boost in overall hair appearance
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