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1990 Jun;258(6 Pt 1):L308-12

Are these peptides referenced in literature related to performance or recovery mechanisms

Perez-Ortin, J

As such, those with sulfur sensitivities may react to other forms of selenium as well

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