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USP guidance describes a 28-day beyond-use date for multi-dose vials after first puncture, assuming aseptic technique on every draw
It essentially helps your body use energy more efficiently
Intermediate users commonly use 300-400 mcg daily, while advanced protocols may utilize 500 mcg daily or divided doses of 250 mcg twice per day
If you have a mild deficiency, B12 pills might work
Proceed at your own risk and talk to your licensed healthcare provider about this
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