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According to the NIH Office of Dietary Supplements, absorption issuesnot intake aloneare a leading cause of low B12 levels

However, no supplement or compound is a substitute for a tailored, comprehensive approach

These are cyanocobalamin and methylcobalamin

Pills are uncomfortable to swallow, & dont work fast or well for me

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)