Hello, I have recently been seeing my GP about my anxiety and possible depression and he decided to do some blood tests for Vitamin D, Thyroid function etc. And the results shown me to be deficient in Vitamin D and so he perscribed me 20,000 IU colecalciferol 500mcg. I am just abit confused with the dosage I should be taking, on the label it says 5 capsules each day for 3 days! This seems like a very high dosage but I am not too sure. Also, what happens after 3 days as he has only perscribed me 15 capsules?