Actually donating blood has other benefits than just lowering your blood pressure.
Donating blood can assist the body's natural detoxification process particularly by reducing levels of "forever chemicals" (PFAS: perfluoroalkyl and polyfluoroalkyl substances) and excess iron. Perfluoroalkyl and polyfluoroalkyl are synthetic, human-made chemicals used since the 1950s for their water-, oil-, and fire-resistant properties. They do not easily break down and persist in the environment and human body. Sources include nonstick cookware, waterproof fabrics, and grease-resistant food packaging.
Also after a donation, the body works to replace the lost blood, which boosts the production of new cells and enhance the immune system. The actual process to regenerate new RBCs expands energy production. A single pint of blood can burn approximately 650 calories to synthesize new red blood cells and proteins.