Mitochondrial-Targeted Antioxidant Supplementation for Improving Cerebrovascular Function in Postmenopausal Women

The goal of this clinical trial is to learn if 3 months of taking the dietary supplement MitoQ \[a mitochondria-targeted antioxidant that targets to reduce mitochondrial reactive oxygen species (mitoROS)\] works to treat age- and menopause-related reductions in brain artery (cerebrovascular) function in postmenopausal women 60 years of age or older free of clinical disease. The main questions it aims to answer are: Does MitoQ improve cerebrovascular function in postmenopausal women? If so, does MitoQ improve cerebrovascular function by lowering mitoROS in these arteries? Researchers will compare MitoQ to a placebo (a look-alike substance that contains no drug) to see if MitoQ can improve cerebrovascular function by lowering mitoROS in arteries involved in brain health and function. Participants will: Take MitoQ (20 mg/day) or a placebo every day for 3 months Visit the research laboratory at baseline and then after 3 months for cerebrovascular testing; there is also a check-in visit at 6 weeks, which is the halfway point Keep track of symptoms and events during their treatment period to report to the study team