BEETroot Juice to Reverse Functional Impairment in PAD

Inclusion Criteria: 1. Age 50 and older 2. Presence of peripheral artery disease, defined as: 1. An ankle brachial index (ABI) \<= 0.90 at baseline 2. Vascular lab evidence of PAD (such as a toe brachial pressure \<= 0.70 or an ankle brachial index \<=0.90), or angiographic evidence of PAD defined as at least 70% stenosis of an artery supplying the lower extremities. 3. An ABI of \>0.90 and \<=1.00 who experience a 20% or greater drop in ABI in either leg after the heel-rise test. Exclusion Criteria: 1. Above- or below-knee amputation 2. Critical limb ischemia defined as an ABI \<0.40 with symptoms of rest pain 3. Wheelchair confinement or requiring a walker to ambulate 4. Walking is limited by a symptom other than PAD 5. Current foot ulcer on bottom of foot 6. Failure to successfully complete the study run-in 7. Planned major surgery, coronary or leg revascularization during the next five months 8. Major surgery, coronary or leg revascularization or major cardiovascular event in the previous three months 9. Major medical illness including lung disease requiring oxygen, Parkinson's disease, a life-threatening illness with life expectancy less than six months, or cancer requiring treatment in the previous two years. \[NOTE: potential participants may still qualify if they have had treatment for an early stage cancer in the past two years and the prognosis is excellent. Participants who require oxygen only at night may still qualify.\] 10. Mini-Mental Status Examination (MMSE) score \< 23 11. Allergy to beetroot juice 12. Currently consuming beetroot juice, oral nitrate or nitrite, or a beetroot supplement and/or unwilling to avoid beetroot juice during the study. Participants will be asked to discontinue these items for 30 days before baseline testing and throughout the clinical trial. If the potential participant is unwilling to refrain from taking these items, they will not be eligible for the clinical trial. 13. Currently consuming one cup or more of beets daily. Participants will be asked to discontinue beet ingestion of one cup or more of beets for 30 days before baseline testing and throughout the clinical trial. If the potential participant is unwilling to refrain from daily beet consumption of one cup or more for 30 days before the trial and during the trial, they will not be eligible for the clinical trial. 14. Non-English speaking 15. Participation in or completion of a clinical trial in the previous three months. \[NOTE: after completing a stem cell or gene therapy intervention, participants will become eligible after the final study follow-up visit of the stem cell or gene therapy study so long as at least six months have passed since the final intervention administration. After completing a supplement or drug therapy (other than stem cell or gene therapy), participants will be eligible after the final study follow-up visit as long as at least three months have passed since the final intervention of the trial.\] 16. Visual impairment that limits walking ability. 17. Six-minute walk distance of \<500 feet or \>1600 feet. Investigator discretion will be used to decide whether participants who walk greater than 1600 feet are eligible. 18. Baseline blood pressure \<100/45. 19. Participation in a supervised treadmill exercise program in previous three months. 20. Using an antibacterial mouthwash (such as Cepacol) or a mouthwash containing chlorhexidine and unwilling to discontinue. 21. An eGFR value \<30 or potassium \>5.0. 22. History of kidney stones that requires minimized intake of oxalate. Potential participants who need to minimize oxalate intake will be excluded from the trial. 23. In addition to the above criteria, investigator discretion will be used to determine if the trial is unsafe or not a good fit for the potential participant.