Vitamin D3 is a fat-soluble vitamin that supports the growth and development of bones and teeth. It also plays an essential role in the functioning of the muscles and boosting energy levels in the body. 

The body naturally produces Vitamin D when exposed to sunlight, and you can also receive Vitamin D from some foods like oily fish. In the winter months, especially in colder regions, the body doesn’t produce as much Vitamin D, leading to ‘seasonal depression.’