Spend some time in the sun—without sunblock. Just a few minutes, depending on where you live and your skin pigmentation, can give you a big D boost—then don’t forget to slather on the sunscreen.Try D-fortified products. You know about milk and bread. But did you know wild-caught salmon and UV-exposed mushrooms are also good sources?Take your supplements. 400 IU may not be enough to see a benefit. Holick recommends 1,500-2,000 IU of vitamin D a day for everyone.