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Oral B12 is most effective for people who: Follow a diet that includes plants Experience mild symptoms Need daily support to stay healthy Like taking supplements at home Do not have absorption problems The American Academy of Family Physicians explains that taking B12 works well to treat mild issues and for general supplementation, provided there are no absorption problems

Goodman says, though some people require them for the long term. Your healthcare provider will make recommendations based on your B12 level, age, diet and overall health

A typical B12 shot contains 1000mcg of B12, which is absorbed at nearly 100% efficiency since it is delivered directly into the bloodstream

Untreated, severe deficiency can result in irreversible nerve damage

A practical target for most adults is half their body weight (in pounds) in ounces of water daily

Store reconstituted material refrigerated (28C) and use within ~4 weeks