Nearly two-fifths of the US population has a marginal amount of vitamin B12 (cobalamin) in their bodies, consequently putting them at a high risk of a deficiency
Stryeck, Y
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Additionally, B12 is vital for DNA synthesis, cell division, and energy metabolism, helping to reduce fatigue
The peptide is endogenously present in human plasma at low nanomolar concentrations in young adults, with the concentration declining with age (a finding from the original GHK research literature that is frequently cited in discussions of the compound)
Doing it wrong can cause bruising, bleeding, or even infection