You can find vitamin K in leafy green vegetables, brassicas such as cauliflower and broccoli, as well as in avocado, kiwi fruit and soybean oil. Vitamin D is formed on the skin when the sun's rays interact with the skin. It is also a fat soluble vitamin like Vitamin A and as such can build up to toxic levels but only when taken as a supplement. You won't overdose on vitamin D by exposure to sunshine. Vitamin D has antioxidant properties and is also anti-carcinogenic which means it could play a role in helping to prevent skin cancer as well as other cancers.
Now here's the dilemma, we are told that exposure to the sun is the number one cause of premature aging, and at the same time we need some exposure in order to get the benefit of vitamin D. The answer as always lies in balance. Don't stay out in the hot midday sun baking away without a sunscreen, but do get a morning walk in the sunshine when the sun is not so strong. It's common sense really.
At times you might have a darker underarm problem. Learn some techniques to lighten your underarms again. One problem that some have is that their underarm area is a bit darker than the other skin on the body. The problem with this is that you can become self conscious about the problem especially when wearing clothing that exposes the underarm area which is a bit too dark. There are some techniques that you can use that will help you make this part of your body a bit lighter.