Topical GHK-CU is easy to build into a daily skincare routine, but the skin barrier can limit how much peptide actually reaches deeper tissue
[DOI] [PMC free article] [PubMed] [Google Scholar] 218.Devi P.U., Ganasoundari A
These typically resolve within 2-3 weeks
In a study of adult survivors of childhood cancer, NR supplementation was not associated with any serious adverse events. Additionally, while not conducted in a cancer-related population, long-term NR supplementation over two years in patients with ataxia telangiectasia reported no adverse effects. While these findings are reassuring and include one of the longer-duration human studies to date, longer-term and broader population studies are still needed
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There is also a risk that, because it promotes blood vessel generation, it might also speed the growth of tumors, if the user happens to already have one
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