What it does: Vitamin D is special in that it's formed in the skin in reaction to direct sunlight. Although its primary function is aiding in bone and muscle strength, it also fights stress and anxiety, as well as benefits the immune system. When we get ill, vitamin D supports the body's production of an antimicrobial peptide called cathelicidin, which aids in stopping the development of harmful bacteria, microbes, and viruses. It also regulates the function of important antibody T-cells. According to a review of randomised controlled studies, "vitamin D supplementation reduced risk of the common cold and flu," Dr. Mafi explained. "Patients who are vitamin D-deficient received the greatest benefit."
Where to find it: Vitamin D is absorbed straight from the sun, so upping your body's intake can be as easy as getting more sun, as well as taking cod liver oil, eating fatty fish like salmon and mackerel, or consuming vitamin D-rich drinks like MOJU's Vitamin D shots which includes 20ug of Vitamin D3 from seaweed in each bottle.