Beetroot Juice: A Natural Boost for Cardiovascular Health in Postmenopausal Women?

Inclusion criteria: * Females under the age of 65 * Self-reported absence of menstrual cycle for \>1 year * BMI \<30 kg/m2. * Able to walk on a treadmill and cycle on a stationary bike without problems. * Proficient in Norwegian and able to provide informed consent. Exclusion criteria: * Current or recent (last 5 years) regular smoker or user of nicotine products * Addictions to alcohol or illegal drugs * Allergy or intolerance (s) to nitrate or BRJ supplement. * Diagnosed with cardiovascular disease (e.g., previous acute myocardial infarction or stroke, peripheral artery disease, heart failure), renal, or respiratory (e.g., asthma, sleep apnea). * Regular usage of nitrate supplements, including beetroot juice * Hormone replacement therapy. * Uncontrolled high blood pressure (e.g., resting systolic and diastolic blood pressure \>160/110 mmHg) * Problems with very low blood pressure (e.g., severe dizziness upon standing) * Diagnosed with diabetes (type 1 or type 2). * Using blood pressure or glucose-lowering medications * Close family (parents, siblings, children) history of sudden cardiac death at an early age (\<55 for men, \<65 for women) * Judgment by a medical provider that exercise poses an undue burden or risk. * Cognitive or psychiatric impairment * Lack of proficiency in Norwegian language oral or writing skills that will hamper the ability to participate in the interventions and fill out questionnaires.