Spending time outdoors and in the sun will naturally increase your vitamin D levels. Vitamin D from the sun may circulate for twice as long as vitamin D from supplements or food. Additionally, you can eat egg yolks, fatty fish, and mushrooms. Oranges are the only fruit that has a significant amount of Vitamin D in it. Vegetables such as spinach, soybeans, and white beans are also good for your health. While these are good ways of increasing vitamin D levels, one can also take supplements. It is recommended that you see a doctor and get your vitamin D levels checked before taking any supplements. Too many supplements can be harmful. Supplements are often beneficial for increasing the level of vitamin D in the body.