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Those taking metformin, proton pump inhibitors, or H2 blockers long-term, as these reduce B12 absorption

I took B12 supplements for several years prior to being diagnosed with a very low level of B12, only 88

But recently, researchers have started spotlighting a surprisingly overlooked piece of that puzzle, Vitamin B12

He continued to say that for people with B12 deficiency, parenteral supplementation (ie not through the mouth/digestive system) therefore is a useless and expensive treatment, and if you still want it the NHS should not pay for it, you should pay for it yourself

The danger isn't the vitamin

Shock 60 , 298305 (2023)