Potassium 200mg - 30 Tablets Blood Pressure Muscle & Nerves. Potassium 200mg - 30 Tablets For Blood Pressure Muscle & Nerve Impulses - Vegan Safe & UK Made. Nutritional Information: Active Ingredients: 400mg Potassium Chloride (giving a minimum of 200mg of potassium (10% nutritional reference value, NRV). ).