Bearded dragons require vitamin supplements to maintain optimal health, particularly calcium and vitamin D3, essential for preventing metabolic bone disease. These supplements should be administered by dusting their food, specifically the insects they consume. It's crucial to use a high-quality, reptile-specific nutritional powder. Additionally, ensure that the UVB lighting in their habitat is adequate, as this helps them synthesize vitamin D3 naturally. Consult with a veterinarian for specific recommendations and dosages to tailor the supplementation to individual dietary needs and health conditions.