The main groups at risk for vitamin D deficiency are as follows:

• Individuals with fair skin

• The elderly

• Patients with diabetes

• Those who work indoors or wear extensive clothing

• Individuals who use high-factor sunscreens

• Those with kidney or liver diseases

• Individuals with malabsorption disorders or poor nutrition

• Those who have undergone gastric surgery

• Pregnant and breastfeeding women

• Individuals taking anti-epileptic medications

• Individuals using corticosteroids

• Those with celiac disease