However, vitamin D doesn’t occur naturally in many foods, and vegans would struggle to get enough of the vitamin without supplements in the winter.
Vitamin D levels may also be lowered due to certain medications, such as:
- Cholesterol-lowering drugs
- Seizure-control drugs
- Rifampin – a tuberculosis drug
- Orlistat – a weight-loss drug
In addition, people suffering from certain health conditions are also at higher risk of a vitamin D deficiency.
This is true of those with cystic fibrosis, Crohn’s disease, and celiac disease.