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In people with normal B12 levels, adding more has not been shown to reduce fatigue
Liver, fish, yogurt, and avocado are all good sources
Related Green Relief Health Guides Medical References National Institutes of Health, Office of Dietary Supplements
A double-blind, placebo-controlled trial in 95 patients with irritable bowel syndrome or inflammatory bowel disease and normal B12 levels found no significant improvements in fatigue, although B12 levels increased in the B12 group who received 1000 g per day per os (p.o.) for 8 weeks (form not reported)
