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where to give im b12 injections at Home - Safety Guide for Self-Administration Choosing the Right Needle and
Description
The injection site can affect absorption rate slightly but does not significantly impact overall effectiveness

Li, J., Sun, W., Zhu, X., Mei, Y., Li, W., & Li, J

Even with oral supplementation, deficiencies may persist due to reduced intrinsic factor or altered digestion
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Am J Pathol (2020) 190:28694
