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US-based compounding pharmacies working with veterinarians are the safest source

Specialized toxicology research shows no embryo-fetal developmental toxicity, no genetic mutagenicity in bacterial and mammalian cell assays, and no adverse reproductive effects in animal models

[DOI] [PMC free article] [PubMed] [Google Scholar] 99.Ogutlu H., Esin I.S., Erdem H.B., Tatar A., Dursun O.B

P-glycoprotein is expressed in epithelial cells related to the drugs absorption and distribution, e.g., in the tubular membrane of hepatocytes, proximal renal tubules, intestinal mucosa, and brain capillaries [80]

& Nordstrom, A

So its possible my B12 has been running low for a while too