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Haemoglobin levels begin to rise after about one week, whilst the mean corpuscular volume (MCV), which is typically elevated in B12 deficiency, gradually normalises
Summary If you have a vitamin B12 deficiency, taking vitamin B12 supplements might increase your energy levels
When you think about boosting your energy or immune system, your first thought might be vitamins in pill form
This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person
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