Skin cancer continues to rise despite people being more sun-aware.

The most common forms affect about one in four Americans. But could something you eat or drink cut your risk in half? Experts point to new science surrounding a common supplement.

Skin cancer runs in David Black's family.

"All I remember is my father always was getting skin cancers taken off," he said.

Black depends on sunscreen. But as he tells his dermatologist, he can't always depend on himself.

"I'll put on sunblock once, but then I'm out hiking for hours and I never put it on again. So I definitely need something that's going to work daily," he said.

Board Certified Dermatologist Dr. Teo Soleymani said a common Vitamin B3 derivative could be just what Black needs.

Researchers studied 34-thousand people who t

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