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Signs you might be low on B12 Low B12 can quietly work against your energy and your weight loss efforts
In general, most people can expect the effects of a B12 injection to last for several weeks to months
Journal of Biological Chemistry
Common side effects of B12 injections These B12 effects tend to resolve on their own within a day or two: Injection site reaction, such as mild soreness, redness, or swelling Brief itching or warmth at the injection area A feeling of fullness or pressure in the muscle Mild headache or nausea shortly after the shot These reactions are typically related to the injection itself, not the vitamin
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