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Pyo et al., 2007) In one clinical study, topical application of GHK-Cu was associated with a ~27% increase in hair density and up to 70% reduction in shedding within three months (Pickart & Margolina, 2018)

It's just so hard to say because of this idea of confounding variables

Ayton S, Portbury S, Kalinowski P, Agarwal P, Diouf I, Schneider JA, et al

Interestingly, we see marginal release of cytochrome c following 5FU and a transient dip in MOMP, but no enhanced difference in sensitivity to BH3-mimetics or increase in ATF4 expression or predicted activity in RNA-seq analysis (data not shown)

Side Effects, Risks & Regulatory Notes Most people tolerate vitamin B12 injections well, but injection-site soreness, transient swelling, or redness can occur