IPA Lab looking for volunteers to study the effect of sodium nitrite supplementation on physiological function. Requirements: Aged 60-79 years Willing to undergo a 12-week period taking sodium nitrite supplement Participants will Receive: - Detailed Blood Panel (cholesterol, glucose, etc.) - Body Composition (body fat & bone density) - Physician-Monitored Exercise Stress Test - Dietary Analysis - Monetary Compensation for time If interested in participating, please email ipalab@colorado.edu, or call 303-735-6410