"Unquestionably, excess sun exposure causes premature aging of the skin and a couple of types of skin cancer. Of this there is no doubt. But, lack of adequate vitamin D appears to be related to an entire host of serious problems including melanoma, the most dangerous and deadly form of skin cancer. The most common type of skin cancer from overexposure is basal cell carcinoma, which is just about the least malignant of all cancers, and if treated (by removal) results in virtually no mortality. The same can’t be said for prostate, breast and colon cancers, all cancers thought to be sun (or, more correctly, lack of sun) related. These cancers are much more prevalent the farther north one goes and almost non-existent at the equator.
The trade off, in my opinion, is well worth it. Especially when it’s possible to have the best of both worlds and avoid both the premature aging, minor skin cancers AND the breast, prostate and colon cancers (not to mention multiple sclerosis, osteoporosis, and the host of other disorders laid at the doorstep of too little vitamin D) by sensible sun exposure."
http://www.proteinpower.com/drmike/supplements/sunshine-superman/#more-4165
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