Recent studies have found that vitamin D supplementation may alleviate depressive symptoms in adults. It is believed that vitamin D regulates the central nervous system and its disturbances are what is associated with depression. Additionally, there is an association between people with depressive symptoms and vitamin D deficiency. The newest and largest meta-analysis on the association of vitamin D supplementation and depression found that “vitamin D supplementation is more effective than a placebo in alleviating depressive symptoms in people with depression. There were major differences in the vitamin D doses used, but typically the vitamin D supplement was 50–100 micrograms per day.” AGEIST recommends regular testing of Vitamin D levels here.