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Taking extra B12 without a confirmed deficiency wont necessarily make you feel more energetic, and pursuing injections without medical need can be unnecessary
Typically, people start experiencing benefits 24-72 hours after treatment
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Hormonal influences, reproductive demands, and autoimmune conditions affecting gastric absorption (e.g., pernicious anemia, thyroid disease) may predispose women to deficiency, while greater health-seeking behavior increases test frequency
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