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While vitamin B12 and folate can be taken together, you should not take too much folate when taking vitamin B12
Use bacteriostatic (not plain sterile) water for a multi-dose vial so the preservative supports the multi-draw window, and reconstitute gently down the vial wall rather than blasting the powder
Even if you suspect the dose was incomplete, giving yourself a second injection risks overdosing and increased side effects
PMID 17766407
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