Vitamin D3 is a nutrient that helps your body to absorb calcium. If a person is deficient in vitamin D, their calcium levels might not be optimally regulated which means they may be at greater risk for osteoporosis.
Vitamin D can help with other areas of bone health too, also teeth health, protect heart failure, keep respiratory tract health.
You can get vitamin D through eating foods such as fish, eggs, and cheese or through exposure to sunlight.