Ingredient overview
What it is
Vitamin D3, or cholecalciferol, is converted first in the liver and then in the kidneys into its biologically active form. That active form helps regulate calcium and phosphorus absorption.
- Scientific identity: Vitamin D3; molecule: Cholecalciferol.
- How it works: Made in skin or taken orally: Ultraviolet-B light converts a cholesterol derivative in the skin to cholecalciferol; supplements supply the same molecule directly. Hydroxylated in the liver: It is converted to 25-hydroxyvitamin D, the circulating storage form that blood tests measure.
- Primary function: It contributes to normal bone maintenance, muscle function and immune-system activity.
- What it supports: Vitamin D3 helps your body absorb and use calcium effectively while supporting healthy muscles and normal immune function.
- Important consideration: Its nutritional contribution depends on the amount provided and overall dietary intake.
