Vitamin D—also known as the sunshine vitamin—is one of the most important nutrients we need. While it is widely available in the form of sunlight, some people who get less exposure to it opt for foods rich in this nutrient (like seaweeds) or resort to supplements.However, for those taking it directly from the sun, it does not mean directly standing in the sun. To get Vitamin D, it requires a proper time and exposure to certain parts of the body to sunlight. For the uninitiated, Vitamin D is synthesised from cholesterol on your skin when it is exposed to the sun. What Is The Best Time?Expose your skin to the sun in the middle of the day, particularly in summer. At noon, the sun is at its highest point, and its UVB rays (UV rays with shorter wavelengths) are most intense. That means you need less time in the sun to make sufficient vitamin D.There is empirical evidence that supports it. A study in Riyadh, Saudi Arabia, investigated the best times for sun exposure to boost vitamin D levels. Researchers exposed ampoules containing a vitamin D precursor to sunlight hourly from sunrise to sunset in July and December. They found that in summer, the optimal time for vitamin D production was from 8:00 AM to 4:00 PM, with peak hours between 10:00 AM and 12:00 PM. In winter, the window narrowed to 9:30 AM to 2:00 PM, with peak production also between 10:00 AM and 12:00 PM. The study concluded that the best time for sun exposure in Riyadh during summer is from 9:00 AM to 10:30 AM and after 2:00 PM, while in winter, it’s from 10:00 AM to 2:00 PM. This approach is a cost-effective and enjoyable way to prevent vitamin D deficiency.Vitamin D Is Synthesised By Cholesterol In Your SkinVitamin D is made from cholesterol in the skin. That means you need to expose lots of skin to the sunlight to make enough. Some scientists recommend exposing around a third of the area of your skin to the sun. The British Skin Foundation recommends daily sunlight exposure of 10-15 minutes for lighter skin and 25-40 minutes for darker skin.Why Are So Many Indians Vitamin D Deficient?Low sun exposure due to urban living, pollution, and indoor lifestyles.Dietary gaps, with many people unable to afford Vitamin D-rich foods like fish, eggs, and fortified dairy.Dark skin tones which need more sun exposure to produce Vitamin D naturally.Cultural clothing and sunscreen use, which reduce the skin’s ability to absorb UVB rays.High testing and supplement costs, further worsened by 18% GST on supplements.Rising obesity and chronic diseases which interfere with Vitamin D metabolism.