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Chronic conditions impacting absorption include atrophic gastritis or pernicious anaemia, where there is a lack of intrinsic factor, a protein essential for the uptake of B12 in the digestive tract

It is important to highlight that CSF2 and CXCL10 encode pro-inflammatory proteins linked to neurodegenerative diseases 51,52,53 , and, as mentioned above, elevated levels of CXCL10 protein are associated with persistent VCD in individuals from the same cohort of the present study 20

Although B12 injections have been used for decades as the fastest way to raise B12 levels, the latest research is saying that well chosen forms of oral B12 will probably work just as well

Vitamin B12 Toxicity Some people might worry that they are getting too much vitamin B12