- Those with vitamin D levels < 25ng/mL will be treated with vitamin D 50,000 IU/wk for 8 weeks; they will be enrolled if the follow-up vitamin D level is 25 ng/mL or more (if after 2 rounds of vitamin D repletion their vitamin D level is not at least 25 ng/mL, they will not be eligible to be randomized into the study).