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This acidity helps maintain the balance of the skins natural oils and protect it from harmful bacteria.35 Because of this, experts recommend using topicals with a more acidic pH, as alkaline products may negatively impact your skins health.36 37 Since The Ordinary Multi-Peptide + Copper Peptides 1% Serum is at least a little acidic, it should be okay for most people, but this may explain why some customers complain about poor skin reactions after using it

As a molecular probe to study copper transport, binding, and homeostasis in biological systems

Younger skin typically tolerates higher doses but may show less dramatic improvement since less damage exists to repair

Journal of the American Academy of Dermatology International

During sleep, cells repair DNA damage, build proteins, and regenerate tissues

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