Life Extension Vitamin D3 175 mcg (7000 IU), Immune System Support, Bone Health, Brain Performance, Gluten-Free, Non-GMO, Once Daily, Two-Month Supply, 60 softgels

Vitamin D3 can be synthesized by humans in the skin upon exposure to ultraviolet-B (UVB) radiation from sunlight. But due to the winter season, weather conditions, and other factors, the bodys ability...