can you have too many b12 injections Vitamin B12: How much is much? | Health News Too much vitamin B12: Level

Mild fatigue or redness at the injection site may occur

Therefore, parenteral cyanocobalamin should be administered to a pregnant woman if the benefits outweigh the risks.[15][16] Cyanocobalamin is excreted in the breast milk of nursing women in levels similar to the level of vitamin B12 in maternal plasma.[25] The distributed cyanocobalamin in breast milk has been found to be compatible with breastfeeding by the American Academy of Pediatrics.[26] In addition, there has not been any reports of adverse effects associated with the intake of normal daily requirements of vitamin B12 during lactation

However, that doesnt mean injections should be used casually or without guidance

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