Here is an interesting medical journal article which surmises that the medical benefits of sun exposure outweigh the disadvantages. Sun exposure causes production of nitric oxide which lowers blood pressure and can help prevent heart attacks and strokes. The nitric oxide production is separate from the production of vitamin D. The risks of hypertension, stroke, and heart disease are higher than the risks of skin cancer.
http://www.medicalnewstoday.com/articles/260247.php
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