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Do You Need a Prescription For B12 Injections

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B12 Injection Dose A typical dose of vitamin B12 is 0.5 to 1.0 ml (or 500 to 1000 micrograms), says Foxx, but always follow your doctors prescribing directions

Oral Supplements: A Quick Comparison For people with a confirmed deficiency, especially those with absorption problems, injections generally act faster than oral supplements: Injections: bypass the gut, reliably reach the bloodstream, and often produce noticeable changes in energy and mental clarity within days for those who are deficient