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One of eight B complex vitamins, B12 plays a key role in red blood cell formation, cellular metabolism, nerve function, and DNA production
Here's something the internet won't tell you when it sells you research-grade powder: with an unregulated compound, what's in the bottle matters as much as the molecule itself
Studies have shown that oral supplements of B12 and injections both offer effective treatment of deficiencies
Its key for those with severe deficiencies or long-term symptoms
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