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The real driver of the 28-day limit is microbial contamination risk from repeated vial punctures
In the early correction phase, injections may be given weekly or fortnightly
Monitor patients closely for sudden drops in blood pressure
Still, not everyone needs injections
Retrieved May 3, 2025, from (Cautions that people with low blood pressure or a history of gout should not take niacin/niacinamide due to risk of hypotension and hyperuricemia
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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