Relatively safe...: Cyanocobalamin ( Vit B12) is excreted into human milk. Cyanocobalamin is considered compatible with breast-feeding by the American Academy of Pediatrics. There are side effects described of too much cyanocobalamin & u shd be aware of them & discuss it with the doctor treating u. Best is to see all the side effects on a site such as drugs.com. Includes: dyspnea, rash, Diarrhoea, vomiting & others.
Answered 5/14/2018
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