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9 23 In a recent RCT in Bangalore, India, daily maternal vitamin B 12 supplementation (50 g/day) during pregnancy through 6 weeks postpartum substantially improved maternal vitamin B 12 status and increased breast milk and infant plasma vitamin B 12 concentrations

Many forms of vitamin B12 supplements are available, including tablets, melting tablets and injections

doi: 10.1056/NEJMoa040720

But if you are worried, remember that other vitamin B12 supplements exist
