I use this product daily following an episode that I experienced several years ago. I experienced a sharp pain and then numbness in my head. I consulted the neurologist, and had MRI, but he could not find anything serious. Then I learned about Alginol and started to take it daily. I also recommended a friend in Japan this product. He was very fearful and was concerned. I showed him about alginol on the web and he was interested in taking it. He has been taking it for the past three years and he reports that his blood pressure is normal and he feels great.