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Key Takeaways High doses of vitamin B12 do not usually cause harmful side effects
Vitamin B12 for hair, skin, and nails If you have a very low level of B12, you may be prone to hyperpigmentation (dark spots) on your skin, vitiligo (light patches on your skin), mouth ulcers, eczema, and acne
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When levels drop, the effects show up in ways that feel vague and hard to pin down
2 studies scored seven, indicating medium-quality studies with low risk of bias
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