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Cold Spring Harbor Perspectives in Biology., 12 (3), a035428

GHK-Cu itself generally doesn't increase sun sensitivity and may even offer some protection

[DOI] [PubMed] [Google Scholar] Xiang W, Schlachetzki JC, Helling S, Bussmann JC, Berlinghof M, Schffer TE, Marcus K, Winkler J, Klucken J, Becker CM

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133 Another randomized controlled trial in 57 subjects undergoing evaluation for male infertility found taking an oil providing 990 mg DHA and 135 mg EPA daily for 10 weeks decreased sperm DNA fragmentation and increased seminal antioxidant status more than a sunflower oil placebo, but did not affect other sperm parameters