Vitamin D3 is used for:
1. **Bone Health**: Enhances calcium absorption, preventing osteoporosis.
2. **Immune Support**: Boosts immune function and reduces inflammation.
3. **Mood Regulation**: May improve mood and reduce depression.
4. **Muscle Function**: Supports muscle strength and reduces weakness.
5. **Heart Health**: Potentially benefits cardiovascular health.
6. **Pregnancy**: Aids fetal development and reduces pregnancy risks.
7. **Autoimmune Diseases**: May lower risk of autoimmune conditions.