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Retinol is a form of vitamin A
Some users report thicker, stronger hair after consistent use of copper peptide serums or shampoos , making them one of the best copper peptides for hair growth
Unlike larger proteins, peptides are small enough to signal specific cellular functions such as tissue repair, collagen synthesis, or inflammation control
The trade-off is the fixed 5:1 ratio: you cannot raise one compound without raising the other
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