People who took a single vitamin pill twice a day cut their risk of the two most common forms of skin cancer by nearly a quarter, Australian researchers reported Wednesday.

The vitamin is a form of vitamin B3 called nicotinamide, and it’s sold in grocery and health food stores for just a few cents a pill. It doesn’t have some of the unpleasant side-effects of its close relative niacin and it’s considered safe to take.

The Australian researchers tested it on 386 people who had already been diagnosed with skin cancer – either squamous cell or basal cell carcinoma. These are extremely common and slow-growing cancers, much less serious than melanoma.

While they are easy to treat, it’s inconvenient and can leave scarring. Left untreated, squamous cell carcinoma, especially, can spread and can kill people.

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