Do I need more vitamin D?
If you’re depressed and have a vitamin D deficiency, taking a supplement may help turn things around, according to a 2017 review in the Journal of Affective Disorders. How do you know if you’re low on D? Your doctor can give you a simple blood test to find out. Don’t be surprised if you have low levels: Research in the Archives of Internal Medicine found that nearly 75 percent of adolescents and adults don’t have enough of the sunshine vitamin in their bodies. The recommended daily maintenance dose is 600 IU.