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A 2023 double-blind, split-face study (n = 60, aged 4065) compared a 0.05 % GHK-Cu serum to placebo for 12 weeks

Diabetes 43, 490497

[Crossref] Chan CQ, Low LL, Lee KH (2016) Oral Vitamin B12 Replacement for the Treatment of Pernicious Anemia

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CD8 + T cells induce interferon-responsive oligodendrocytes and microglia in white matter aging

Doing so will help the serum to penetrate deeper into the inner skin layer more efficiently.
