Finally, a summary would reveal a consistent demonstration of particular beneficial effects, i.e., the activation of collateral pathways related to the injurious occlusion (Vukojevic et al., 2018
This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation
See the concentration calculation tables above for more options
The best way to handle any side effects is to communicate openly with your medical provider
Swanson, A