The further away from the Equator you live, the less vitamin-D producing UVB light will reach you during winter. Vitamin D is necessary for a healthy immune and nervous system, and is also important to help you stay well throughout the typical cold and flu season. When the Sun’s rays enter the Earth’s atmosphere at too shallow an angle, during the early and latter parts of the day, and during winter season, the atmosphere blocks the UVB portion of the rays.
Posted on: Sat, 10 May 2014 16:47:20 +0000