Participation in this study will include 3 in-person visits and potentially 28 days of at-home menstrual cycle tracking (if you are still experiencing periods). You will be asked to complete surveys at your convenience regarding your health, menopause symptoms, stress, and mood. At your first visit, we will measure your body composition and muscle characteristics followed by a submaximal exercise test on a stationary bike. Visits 2 and 3 will include measures of your resting metabolic rate, four small blood samples, a randomized nutrition supplement (protein or placebo), and a high intensity exercise protocol on a stationary bike.