This video is hilarious.
Should I take Vitamin D?
Taking Vitamin D3 supplements has drastically improved my health. (My Vit D test result level was 7 before supplementation.) However, a friend of mine started taking Vitamin D without getting tested first and developed a kidney stone.
I highly recommend getting tested before supplementing, and reading the articles on the Vitamin D council's website.
Not every recommendation works for every single person.