Nicotinamide (vitamin B₃) has been shown to have protective effects against damage caused by UV radiation and to reduce the rate of new premalignant actinic keratosis and non-melanoma skin cancers.  Here are the numbers from the Study published in the New England Journal of Medicine:

• 386 participants who had had at least two non-melanoma skin cancers in the previous 5 years received 500 mg of nicotinamide twice daily or placebo for 12 months.
• The number of actinic keratoses at 4 months was 29% lower among those who received 500 mg of nicotinamide administered orally once daily and 35% lower among those who received 500 mg of nicotinamide twice daily than among those who received placebo.
• Patients taking nicotinamide twice daily experienced a 25% decrease in non-melanoma skin cancer rates.

AboutSkin now has nicotinamide available for your convenience.  It retails for $29.50 + tax for 100 tablets.  We advise taking one table twice daily to maximize the health benefits.

If you want to read the entire study, here is the link:

http://www.nejm.org/doi/full/10.1056/NEJMoa1506197#t=article

For additional information, including interesting new research on how eating too much grapefruit may increase your risk for melanoma, read the following article:

http://dermatologytimes.modernmedicine.com/dermatology-times/news/more-light-shed-skin-disease?GUID=F8BCEE45-EF77-40D7-BF43-16E0CBD6D173&rememberme=1&ts=31072016