Potassium Supplementation to Reduce Blood Pressure

Inclusion Criteria: * Willing and able to provide informed consent * Between 20 to 64 years old * English speaking * Adults who are not receiving antihypertensive pharmacological treatment * Recent (within 6 months) and latest systolic blood pressure measurement ≥130mmHg and/or diastolic ≥85 mmHg * Have access to internet and equipment for video calling * Able to post samples and equipment to OxBCNH * Physically able to take own body measurements and blood pressure Exclusion Criteria: * Participation in another research study * Unable to read and understand the instructions provided in English * Unable to comply with experimental procedures or not follow testing safety guidelines * People with cardiovascular conditions: heart attack or stroke within the last 3 months, heart failure of grade II New York Heart Association and more severe, or prolonged QT syndrome, angina, arrhythmia or atrial fibrillation. * Uncontrolled type 2 diabetes (HbA1c\> 9%) * Type 2 diabetes controlled using exogenous insulin * Previous or current diagnosis of diabetes complications such as nephropathy, retinopathy and neuropathy. * People with type 1 diabetes * Currently on any medication that may lead to hyperkalemia or fluid retention * Currently being assessed for diagnosis of hypertension (not receiving treatment for high blood pressure) * Already on clinician/HCP supervised diet or restricted diet * They are planning on going away from home (holiday or other) during the 4 week intervention per…