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Other risk factors for B12 deficiency are stress, excessive alcohol use, and smoking
Breastfeeding Cyanocobalamin is excreted in the breast milk of nursing women in levels similar to the level of vitamin B12 in maternal plasma (18)
2003 Mar;133(3):801-7
Neither compound competes for receptor binding, shares metabolic cofactors, or produces overlapping side effect profiles in published research
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