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Description
The most commonly ordered test for assessing B12 deficiency is known as a serum B12 level

Metformin (for diabetes), proton pump inhibitors (such as omeprazole or esomeprazole), and H2 blockers (such as famotidine) can all reduce B12 absorption over time

PubMed Xiong, Y., Mahmood, A., Lu, D., Qu, C., Goussev, A., Schallert, T., & Chopp, M

Modern Nutrition in Health and Diseases

This has become a relatively hot topic recently and one that many people may be too quick to jump to

12.5 mg Biotin