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You may need to have basic blood tests (ferritin, Hb) done first

"The role of homocysteine-lowering B-vitamins in the primary prevention of cardiovascular disease"

One very small study found that people who used semaglutide had lower B12 levels, but these patients also had bariatric surgery prior to using semaglutideso its hard to say if using semaglutide would lead to a B12 deficiency, requiring additional B12

The debilitating fatigue which seems to be the most common symtpom of B12 deficiency may be due to a combination of neurological factors, anaemia, and the role of B12 in the mitochondria

- Repeat daily if required