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We suggest regular checks of: Serum B12 levels Methylmalonic acid (MMA) levels Complete Blood Count (CBC) These tests help doctors see if B12 is working right and adjust treatment as needed

An ideal solution for anyone with digestive problems that make it difficult to absorb nutrients from food or oral vitamins, vitamin injections deliver nutrients directly into the bloodstream, where they can be utilized immediately

10.1186/s12951-022-01455-0 79 YangY.HuangJ.LiuM.QiuY.ChenQ.ZhaoT.et al (2022)

Any benefits that were a result of the supplementation will likely diminish over time

Also, proper confirmation will reduce the chances of error