Your bones hurt
Adults who don’t get enough vitamin D often have aches and pains in their muscles and bones, especially in the winter. Their joints are also a little stiffer in the morning. “Many aches and pains are symptoms of the classic vitamin D deficiency, osteomalacia,” says Sonya Angelone, MS, RDN, spokesperson for the Academy of Nutrition and Dietetics. Soft bones are more likely to bow and fracture than ones that are healthy and hard. Here are some other simple ways to boost your bone health.

You’re experiencing erectile dysfunction
If you or your sexual partner is suffering from erectile dysfunction (ED), lack of vitamin D may be to blame. A study in the journal Atherosclorosis found that men with a vitamin D deficiency were much more likely to have ED, and the lower the levels, the higher the risk factor. Some experts suggest that treating a vitamin D deficiency may decrease the risk of ED, says Angelone. So start taking those D supplements (or giving them to your partner), but just don’t make make these common vitamin mistakes that many of us don’t realize we’re making.