diagram of the vitamin b12 injection site Injections for Aging and Longevity Best Vitamin B12 Injection Sites
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I was able to get my order to go through on mycare.de, but then I got a succinct email back to the effect that they no longer ship vitamin B12 to the US

The systemic bioavailability is about 90% at repeated once-daily dosage as opposed to 64% following a single dose

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[DOI] [PubMed] [Google Scholar] 76.Alano, C
Han BI, Lee HW, Ryu S, Kim JS

Association of vitamin B12 with obesity, overweight, insulin resistance and metabolic syndrome, and body fat composition
