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:

  • Laxatives
  • Steroids
  • 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.

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