Is Cyanocobalamin Co 57 safe while breastfeeding?
Here is what NIH LactMed, the U.S. National Library of Medicine's authority on medicines and breastfeeding, reports about Cyanocobalamin Co 57. This is a summary of that source — not our own verdict.
Effects on the breastfed infant
Relevant published information was not found as of the revision date.
Effects on milk supply
Relevant published information was not found as of the revision date.
Levels in milk
Co 57 decays by electron capture with a physical half-life of 271.79 days. Maternal Levels. A woman who was 3 weeks postpartum was given oral cyanocobalamin Co 57 in a dose of 18.6 kBq, followed by an intravenous dose of unlabeled cyanocobalamin as part of the Schilling test. Milk samples were collected 6 times during the first 25 hours, then at 49 and 73 hours after the dose. Peak milk radioactivity occurred between 17 and 25 hours, with levels of 0.25 to 0.26 Bq/mL. The woman was found to have some cyanocobalamin malabsorption, so the milk levels may have been lower than in a mother with unimpaired absorption.[ 1 ] Infant Levels. Relevant published information was not found as of the revision date.
“No published information” means the studies do not exist yet — not that Cyanocobalamin Co 57 is known to be harmful, and not that it is known to be safe. Your prescriber or pharmacist can weigh your baby's age and whether a better-studied alternative would do the same job. Worth asking before stopping a medicine you need.
Source: NIH LactMed (National Library of Medicine).
Educational summary of an authoritative source — not medical advice. Never start, stop, or change a medicine while breastfeeding without confirming with your doctor.