Vitamin D3 is a factor in supporting healthy bones and teeth as well as helps support calcium and phosphorus absorption.* Vitamin D also helps support the function of the immune nerves, and muscles systems in those who are deficient.* Vitamin D supplements may be necessary during winter months, when sunscreen is used, or when dietary intake is insufficient.* Vitamin D3 5000 IU from Webber Naturals is formulated with 200 mg of organic flaxseed oil to support absorption.