I had originally purchased this product because I had heard it helps with blood flow, I work in heavy construction, constantly using heavy powered, vibrating, impacting, pounding tools, putting constant vibrations through my hands, arms and shoulders eventually overtime, causing my fingers to go numb and lose feeling when I sleep. I started taking opti-red 50 to help with the problem already described above not knowing if it would work or not, and it actually has increased my blood flow now my fingers are not going numb as previously