Increasing fiber intake by consuming fiber-rich foods and supplements such as Metamucil is a safe and effective way to relieve high blood pressure. A 2005 analysis of 25 medical studies conclusively linked high-fiber diets to lower readings for both systolic and diastolic blood pressure, as reported by WebMD.
Metamucil is a psyllium fiber supplement frequently recommended for relieving constipation and reducing cholesterol, per Everyday Health. In addition to improving blood pressure, fiber-rich diets are helpful for weight maintenance and regulation of blood sugar, and can also reduce the risk of heart disease. Increasing fiber gradually over several weeks may help the digestive system adjust, reducing the possibility of side effects such as gas pain, according to Mayo Clinic.