People in most parts of the country are now a little more than a week removed from turning their clocks back and by now they are likely noticing that it has begun getting dark much earlier. The time change combined with the shortening of days has contributed to sunsets that come hours earlier than they did in summer.

While this may be a sign that winter is right around the corner, it is also an indication that people should consider taking vitamin D supplements. The sun is the primary source of the nutrient for most people. It is produced naturally in the skin following exposure to the sun's ultraviolet rays.

However, with the sun going down so much earlier, people find it very difficult to get enough sun exposure to maintain adequate levels of vitamin D. Furthermore, those who live at higher latitudes are now getting less direct sunlight, which means it is not as strong.

During the winter months, many people come to experience vitamin D deficiencies. The Centers for Disease Control and Prevention estimates that up to a third of all adults have the problem throughout the year, but that number is sure to be higher during times of the year when the sun is less prevalent.

Vitamin D supplements can help individuals avoid the health consequences associated with low levels of the nutrient.