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Am J Hum Genet 59(2):475 Caron NS, Wright GE, Hayden MR

This absorption difference explains why many athletes bypass the supplement aisle entirely

Rarely, some individuals experience mild side effects such as nausea or stomach upset

What to Do If You Miss an Injection Day If you miss a scheduled injection day, apply the dose when you can and count 5 days forward from that new date

Vitamin B12 injections are a safe and effective way to treat B12 deficiency, and we commonly recommend them for patients who have trouble absorbing this essential vitamin from food or oral supplements