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Further general information on the clinical pharmacology of cyanocobalamin vitamin B12 for intramuscular injection including contraindications and precautions Quality: B12 Direct works only with country of origin government licensed suppliers and have independently tested our vitamin B12 for quality and safety at Mrieux NutriSciences (Vancouver Canada)
Time needed for improvement ranges from a few days to several weeks, depending on the individual
& Liu, D
However, this is typically mild and will wear off quickly
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