Vitamin D3, also known as cholecalciferol, is a supplement that helps your body absorb calcium.
It’s typically used to treat people who have a vitamin D deficiency or related disorder, such as rickets or osteomalacia.
Some individuals who might need extra vitamin D include:
- Older adults
- Breastfed babies
- People with darker skin
- Obese individuals (or those who’ve had gastric bypass surgery)
- People with conditions such as cystic fibrosis, Crohn’s disease, or liver disease
Vitamin D3 may be used with different supplements or medicines to treat or prevent other conditions.