blood test after b12 injections Vitamin B12 Injections: Benefits, Who They're For, and What to How Long Does a B12

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

In the blood stream as nicotinic acid, it can cause skin flush and this reaction is actually responsible for the tolerable upper limit (UL) for niacin at 35 mg/d for adults in US (20)

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Less than 1% of people with B12 deficiency report getting optic neuropathy

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