Doctors who perform skin cancer surgeries often recommend nicotinamide — which is a form of Vitamin B3 — to their patients. It's been shown to protect cells from UV radiation damage.

Now, a new study of nearly 34,000 veterans, finds this over-the-counter supplement is linked to a reduction in non-melanoma skin cancers among people who've already had skin cancer. The research was published in JAMA Dermatology.

The biggest reduction was seen among people who began taking the supplement after being diagnosed with their first skin cancer. Researchers found those who took 500 mg of nicotinamide, also known as niacinamide, twice daily, for at least one month, had a 54% reduced risk of developing another skin cancer, compared to patients who did not take the supplement.

Overall, the reductio

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