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Annals of Medicine

The NHS advises that taking up to 2 mg (2000 micrograms) per day of vitamin B12 in supplements is unlikely to cause harm

This is fundamentally different from how minoxidil works, which primarily dilates blood vessels, or how finasteride works, which blocks DHT production

They are a practical alternative for patients who find tablets difficult to tolerate, though current evidence does not clearly demonstrate superiority over standard high-dose oral tablets

This vitamin can mostly be found in animal products, and its sometimes added to other food items

Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms