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Initial blood work is recommended to confirm whether a patient is genuinely deficient in B12 and needs supplementation, or whether another underlying issue may be affecting energy, weight, or metabolic function
Vitamin B12 injections have been proven effective for years
Around 4.5 in 100 adults fitted that pattern, roughly twice as many as had classic low-B12 deficiency, and it was linked to higher long-term mortality while classic deficiency was not, once other factors were accounted for
Serious side effects are rare but can happen in some people
A deficiency in vitamin B12 can show up in several ways
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