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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)
The limiting factor there is not receptor behavior at all, it is copper
This is because stomach acid is needed to release vitamin B12 bound to proteins in food
(11) P Dick, C Costa, K Fayolle, M E Grandjean, A Khoshbeen, and R Tissot (1984) DSIP in the treatment of withdrawal syndromes from alcohol and opiates European Neurology, 1984, Volume 23 (Issue 5), Pages 364-71
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