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If you are deficient in vitamin B12, improvement in symptoms such as tiredness may begin within days to weeks after starting injections

Symptoms, progress and/or lab results are reviewed in depth to build a personalized treatment plan for ongoing care

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)

There is no consensus on the tolerable upper intake level of vitamin B12 or if too much is toxic