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Monthly Dosing Volumes How often you get vitamin B12 shots can change, from weekly to monthly

(source) How Do You Build a Glutathione Routine That Works for You

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For researchers, the relevant cautions are (a) most of this work comes from a small number of laboratories with overlapping authorship across decades, and (b) the in vitro concentrations at which effects are reported (sub-nanomolar to nanomolar) are within the plasma-concentration range claimed for endogenous GHK, but human plasma concentrations themselves rest on a thin measurement base

PMID: 18612058 View source Pickart L, et al