A 25,000 person study shows that vitamin D supplementation does not reduce the incidence of cancer or cardiovascular disease versus a placebo. However, sun exposure has been tightly correlated with reduction in certain cancers as well as cardiovascular disease. Aim to get outside for 15 minutes with no sunblock, at least three times a week, to reap these benefits. See Healthy Gut, Healthy You for more specific dosage guidelines and considerations for your specific vitamin D level. https://drruscio.com/?p=29579
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Dr. Ruscio Radio, DC: Health, Nutrition and Functional Healthcare