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summary Some animal studies suggest that a deficiency in vitamin B12 may increase body fat percentage and alter metabolism

It's also believed to support brain health and mood

[17] It is an auto-immune disease that affects the stomach and leads to poor absorption of vitamin B12

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These include sarcoidosis, high phosphate blood levels, high calcium blood levels, excessive vitamin D levels, arteriosclerosis with occlusion of the arteries, kidney stones, kidney disease with reduced kidney function, and allergies to vitamin D