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In my latest book How Not to Diet , I suggest a third option to B12-fortified foods and supplementsbrushing twice daily with a B12-fortified toothpastespecifically this brand, which was put to the test in two double-blinded, randomized, placebo-controlled studies

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Vitamin B12 plays a role in maintaining skin health by promoting cell regeneration and repair, which keeps the scalp hydrated and free from irritation

Fewer risks, but monitoring is still recommended for high doses or sensitive individuals

PMID 21296191