You can get vitamin D from a few different sources, including the sun and food.
“Very few foods naturally contain vitamin D,” says Christy Brissette, R.D., a dietitian and the owner of 80 Twenty Nutrition. She lists off oily fish, egg yolks, and mushrooms as potential food sources, along with fortified milks.
“Your body makes vitamin D when your bare skin is exposed to sunlight, but it’s difficult to know how much your body is making because it can be reduced by using sunscreen—which is necessary for skin cancer prevention and anti-aging,” Brissette says. The amount your body makes in response to UV light also lowers as you get older, she points out.
Vitamin D is also available in supplement form, although Cording says it’s best to talk to a healthcare professional before taking one of these.