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[DOI] [PMC free article] [PubMed] [Google Scholar] 176.Watkins L.R., Hutchinson M.R., Johnston I.N., Maier S.F

Find out in the B-12 section of our B Vitamin Supplements Review

Forehead skin is relatively thick compared to the eye area, potentially tolerating higher concentrations without irritation

Most cosmetic peptides have one or two well-characterized mechanisms
Chapman D, William RM, Ladbrooke BD

But you can have symptoms of more than one type