Question: how long does it take for hawthorn to lower blood pressure?
Answer: One review of 29 clinical studies with more than 5,500 people found that hawthorn was safe when used in recommended dosages. Doses found to be safe were from 160 to 1,800 mg daily, and from 3 to 24 weeks in length. You may not notice any improvement for 6 to 12 weeks.