Tag: vitamin d sun exposure chart. OVERWHELMING PROOF THAT VITAMIN D3 DEFICIENCY CAUSES MOST HUMAN DISEASES. February 22, 2020 jefftbowles 39 Comments. Our skin can turn 7-dehydrocholesterol into vitamin D with just a little help from sunshine. If you don’t get much sun, no biggie, you can also get vitamin D from your food. Feb 16, 2018 · While a little sun exposure can be good for vitamin D status, too much can increase the risk of skin cancer, cautioned Dr. Jean Y. Tang, associate professor of dermatology at Stanford University.