Life Extension Vitamin D3 5000 Iu with Sea-Iodine Capsules, 60 Count
Vitamin D3 can be synthesized by humans in the skin upon exposure to ultraviolet-B (UVB) radiation from sunlight. But, due to winter season, weather conditions, and sun screen use, the body's ability to produce optimal vitamin D levels may be inhibited. These factors point to the value of taking a daily vitamin D supplement.