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This phrase refers to a reduction in the natural keratin protein, which is a key structural component of skin, hair, and nails. Products addressing this aim to replenish or protect keratin. It does not refer to a specific ingredient.
No specific concern data available
Safety summary
This is a condition, not an ingredient, so no specific safety summary applies.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.