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Biomarkers of nutrition for development (BOND): vitamin B-12 review

Here too it holds: this is preclinical mechanism research, not proven effects in humans

This risk is unquantified but mechanistically plausible and is not discussed on most vendor pages

PLoS One 2009

What many don't know is that it also relates to muscle, bone, and blood vessel health

(Native, unmodified recombinant human IGF-1, sold as mecasermin/Increlex, is FDA-approved only for a narrow pediatric growth-failure indication and is chemically distinct from the LR3 analog.) In the US it is manufactured and sold almost exclusively as an unregulated "research chemical" labeled "not for human consumption," a labeling practice peptide vendors use to avoid marketing it as an unapproved drug