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If its used for a medical procedure, it wont cause lasting effects but if its frequently used recreationally, it can seriously affect B12 levels, cause a deficiency and impair healthy functioning of the body (Campdesuner et al., 2020

Each corresponds to a specific quality parameter and a specific failure mode it is designed to catch

My interest was sparked

Lets say you have a 50mg vial of GHK-Cu

Pharmacological Reports , 2018 Neurological and NO Pathway Regulation: Emerging data suggests that BPC-157 may modulate nitric oxide (NO) and dopamine systems, which could explain its potential for nerve regeneration and mood regulationthough lower doses may be more appropriate for systemic neurological use

If a peptide has 2 percent sublingual bioavailability, achieving a therapeutic dose of 200 mcg in circulation would require placing 10,000 mcg under the tongue