b12 injections safe while breastfeeding Injection Breastfeeding: What Every Nursing Mother Should Kn – MomMed Effects of B12 on Breastfed
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Reitman in Cresskill, NJ

No dose-limiting toxicities were observed at any tested dose
What are some effects of vitamin B12 on health

But, its safer to get help from a doctor, even more so for IV shots or if you have health issues