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Typically, the effects of Vitamin B shots can last for several days to a week, depending on individual metabolism and lifestyle factors
BMJ (Clinical research ed)
Though doses of up to 2,000 mcg of vitamin B12 are considered safe, its best to speak with a doctor to find out whether taking a supplement is necessary
These injections are often used as a part of a weight loss regimen, including a low-calorie diet
306). This is likely due to decreased digestive enzyme production or decreased stomach acid resulting in a decreased ability to cleave B12 from its carrier proteins in animal foods
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