What is the fastest way to get vitamin d?

Vitamin D: Vitamin d is absorbed through the skin by exposure to sunlight, it is also absorbed in the gut, so food rich in vitamin d is important to have in diet.

D3, 5000-8000 IU day: When diet and sun exposure are insufficient to raise vitamin d levels many physicians recommend a daily dose of 5, 000-8, 000 iu of vitamin d3 . Once 25 hydroxy vitamin d levels reach 60 - 80, the daily dose (5, 000-8, 000) is usually cut in half and the patient followed to ensure the new dose is able to maintain therapeutic vitamin d levels.