It would depend on what part of your brain has the hypo-perfusion. You might consider taking aspirin as therapy. Therapeutic aspirin will help increase blood flow. Most take 81 mg of normal aspirin. I take enteric coated aspirin that does not dissolve in the stomach. This is a safe from of aspirin therapy. I don't know if 81 mg is available in enteric form. Find the lowest dose of enteric aspirin. take one each day.

Also, niacin is helpful with circulation.