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It is not something to source or self-administer independently
Weight gain is caused by a combination of factors
For individuals with pernicious anaemia or a condition that prevents B12 absorption, injections are medically necessary because oral supplementation will not be absorbed effectively
Depending on the individual, they start working within 48 to 72 hours of the first dose, but they might take three months to completely correct a B12 deficiency
The health practitioner will prescribe the injection, usually monthly or bi-monthly, so keeping track of the injection schedule is not hard
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