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Material obtained outside controlled research supply chains is not characterized to the same standard, and identity, purity, and endotoxin status can vary substantially between sources
Diet and nutrition: A diet rich in B12 or other essential nutrients can support faster improvements
Vegetarians and vegans may also face challenges in obtaining adequate B12 from their diet, as the vitamin is predominantly found in animal products
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In vitamin B 12 deficiency, red blood cells are unusually large and appear abnormal
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