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b12 injections best place Vitamin Injection Sites: All You Need to Know B12 vitamin Store A Manual
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Manufacture instructions: After opening keep refrigerated and best use is within 5 days

If you have severe deficiency, B12 injections might be more appropriate as they have nearly 100% absorption rate

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If the deficiency was purely dietary, oral supplementation may be considered after initial repletion

To me this was not normal & requested assistance eradicating the cause rather than resorting to pain medication
