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Nicotinamide riboside and nicotinic acid riboside salvage in fungi and mammals

I have seen 11 doctors and the only b12 test they will give me is the serum

Headache 59 , 10741079 (2019)

Zheng H, Chen Q, Chen M

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Anyone can be affected, but some groups are more at risk: Vegetarians and vegans, since B12 mainly comes from animal products Older adults, as absorption gets harder with age People with digestive issues like Crohns or coeliac disease Those taking certain medications, such as long-term metformin or stomach acid reducers People with pernicious anaemia, an autoimmune condition that stops you from absorbing B12 If you fit into one of these categories and notice symptoms, its worth getting your levels checked