Your daily SPF just got backup in the battle against skin cancer.

New research suggests a cheap, over-the-counter supplement may help protect against the disease — with benefits showing up in as little as a month.

Better yet, scientists found the vitamin cuts the risk of recurrence by more than half in people who have previously received a positive diagnosis. 3

The findings back up what dermatologists have been telling skin cancer survivors for a decade — take nicotinamide , a form of vitamin B3.

The advice stems from a 2015 clinical trial of 386 patients, which found fewer new skin cancers in those taking the supplement.

But verifying those results on a larger scale has been difficult, since nicotinamide can be purchased without a prescription, leaving no record in patients

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