We often hear that it is advisable to supplement with vitamin D3 in autumn and winter. What is this vitamin and why should you have it in your home pharmacy? Vitamin D belongs to the group of chemical compounds. It includes vitamins D1, D2, and D3. All of them are fat-soluble. Taking vitamins from the group D with fats also improves their absorption. Naturally, we obtain them through skin synthesis under the influence of sunlight. Therefore, vitamin D3 is often referred to as the „sunshine vitamin.”