can b12 injections stop working

https://www.suprememed.com/wp-content/uploads/2023/03/cf17a61f-9631-4ac5-8c74-7b654a60dad4.jpg Size:1000 mcg/ml - 30 ml (Pack of 3) [2] Long-term follow-up: Once stable on maintenance therapy, routine blood monitoring is not usually necessary unless new symptoms develop livestock vitamin b12 B12 Shot – Touch of Class Medspa

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