Nutritional Supplements » Natural Source »Source Naturals Vitamin D-3 5000IU, Bioactive Form for Bone and Immune Health

1. Our bodies manufacture vitamin D-3 when the skin is exposed to UV radiation from sunlight, but the ability to do so decreases as we age
2. Helps maintain healthy calcium and phosphorus levels in the body for strong bones
3. Supports increased muscle strength in older adults, and it also plays an active role in a healthy immune response
4. It is the form of vitamin D that the body manufactures in sunlight, and the form most efficient for the body's needs