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75 Finally, psychological stress has been shown to influence hair graying, with recent studies indicating that hair pigmentation can sometimes reverse after stress is alleviated
[DOI] [PMC free article] [PubMed] [Google Scholar] [139].Kunt T, Forst T, Wilhelm A, Tritschler H, Pfuetzner A, Harzer O, Engelbach M, Zschaebitz A, Stofft E, Beyer J
[DOI] [PubMed] [Google Scholar] 43.Yoshida S, Leskiw MJ, Schluter MD, Bush KT, Nagele RG, Lanza-Jacoby S, et al
However, the real sources of PGs are not well known and are a matter of speculation
