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Toxicology and Safety Data Copper peptides have been used in cosmetic formulations for decades with relatively few reported safety concerns when used appropriately

While one study found no evidence of obvious vitamin B 6 deficiency in asthmatic children (125), others have shown decreased plasma and erythrocyte vitamin B 6 levels in asthmatics versus controls that were not entirely normalized with vitamin B 6 supplementation (65, 277)

Harington and Mead finally described the correct chemical structure of the tripeptide in 1935 (13)

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