Why is it people monitor when to change the oil in their car but not their vitamin D level

Well SupportedUp to 70% of people in the US are deficient or insufficient in vitamin D, suggesting widespread supplementation is advisable.

Well SupportedVitamin D influences gene expression by interacting with approximately 20,000-30,000 gene receptors throughout the body.

Well SupportedMeasuring vitamin D blood levels is crucial when supplementing, especially for individuals with polymorphisms affecting vitamin D conversion.

Well SupportedThe tolerable upper intake of Vitamin D is 4,000 IU.

Well Supported