Cyanocobalamin represents the most common and affordable synthetic B12 form requiring conversion to active forms in your body
References 2010 Fibromyalgia Diagnostic Criteria - Excerpt. American College of Rheumatology , 2010, www.rheumatology.org/ Arnold, Lesley M., et al., AAPT Diagnostic Criteria for Fibromyalgia. The Journal of Pain , 2018, doi:10.1016/j.jpain.2018.10.008
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It is completely metabolized by the cytochrome P450 system, and its metabolism is dependent on CYP2C19
This means that high serum B12 levels can persist for some time after large supplemental doses
If all these steps have taken place, the vitamin B12 is absorbed further down in the small intestine in the ileum