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In fact, going beyond 500 mcg daily hasnt shown significantly greater fat-loss outcomes (related trial safety/efficacy background)

Causes of vitamin B12 and folate deficiency

Boden, G., She, P., Mozzoli, M., et al

However, the RDA of 2.4 mcg for people under 50 years of age is much harder to meet on a vegetarian or vegan diet