Hello, I went through your query, People get vitamin D through food and by exposure to sunlight. For most adults, vitamin D deficiency isn't a concern. Some, especially those with dark skin and adults older than 65 are at higher risk for the condition. Most people have no symptoms. In severe cases, deficiency can lead to thin, brittle or misshapen bones. Vitamin D supplementation is the main treatment. Please consult a general physician for prescription.