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Store the mixed vial at 4 C and use within 28 days
If your levels were already healthy, a single shot tops you off, and the noticeable effects fade sooner
Frequently Asked Questions How quickly do vitamin B-12 injections work
High-dose B12 supplements, even 1,000 mcg daily, are generally safe because the body uses what it needs and excretes the rest
The useful observation in this window is simple tolerability whether the chosen route is comfortable and consistent
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