When taken consistently, a type of vitamin B3, known as nicotinamide, was shown to enhance DNA repair and restore the skin's immunity in skin cancer patients.

The study comprised of 386 patients who had been diagnosed with at least two skin cancers, such as basal cell carcinoma and squamous cell carcinoma, in the last five years. Half of the study group was randomly assigned to take 500 milligrams twice daily of nicotinamide, while the other half took a placebo. This treatment was well-tolerated in the patients, whose ages ranged from 30 to 91 years and who were considered high-risk due to their history of skin cancer.
It was seen that when patients stopped taking the supplements, their risk of getting skin cancer rose again about six months later, indicating that the benefit can only be gained if the supplements are taken consistently. Damian said, "This is ready to go straight into the clinic."
Researchers stressed that the study involved nicotinamide, and not nicotinic acid, another common form of vitamin B3 that has been associated with few side effects including flushing and low blood pressure. Damian even cautioned that the treatment was not tested as a remedy or prevention strategy for the general public, and that sunscreen is still necessary to protect against skin cancer.
Source-Medindia