Participants will be asked to attend 3 visits over the course of the 4-month study. At the initial visit, participants will complete a short questionnaire about their past medical history and medication history. At the baseline visit, participants will be randomized in a 1:1 ratio to receive atorvastatin 40 mg nightly vs. matching placebo. At baseline and follow-up visits, participants will provide an update on medical problems and medications, review any potential side effects, and have fasting blood tests collected for safety monitoring, including liver and muscle enzyme monitoring. In addition, all participants will have MRI and ultrasound measures collected.