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B12 injections are considered very safe and often have no side effects

Bioavailability studies on comparable small peptides (molecular weight 200400 Da) show SubQ achieves 8894% of IM bioavailability with significantly lower inter-dose variability

Various formulations of peptides can hit receptors in the body and have drug-like effects, explains Spencer Nadolsky, DO, an obesity and lipid specialist physician in Portage, Michigan

For example, a review by Gwyer and colleagues (2019) concluded that while studies have reported findings across experimental models, the majority of the evidence comes from laboratory and animal research