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Over four draws from a 10mg vial, this can mean losing 0.04 to 0.2ml of solution, enough to reduce your final dose by 5 to 10%
Even if the solution still looks clear, you've lost an unknown percentage of potency, and there's no way to recover it
After that, it becomes once every 3-4 days over the course of 3 weeks
The needle is fine, and the injection site is only slightly tender for a short time afterwards in some cases
Pregnant patients should discuss B12 supplementation needs directly with their OB provider
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