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I wasn’t sure how to rate this because as far as feeling more alert, feeling like my memory and concentration are improved, it's been fantastic. However, I just went to have blood work drawn and after a month of being on this, my liver enzymes have risen significantly. I've tried searching all over the web and found a few articles that do cite "harmful elevation of liver enzymes." So I have to quit taking it and hope that the liver enzymes go back down. If anyone has been taking this for a while and not had your liver checked, you might want to do that on a sooner rather than later basis. So bummed.