I've used this product for almost a month and can already see small changes in my memory. I know it takes, sometimes, about 4 months for a supplement to reach its full potential. I am VERY happy with the results so far and am looking forward to further improvements !!! I HIGHLY recommend Neuriva for those of you who are looking for something to help with memory issues. Please note that I have done my research and have found that Neuriva is better than Prevagin when it comes to memory health. I am 70 years old and plan on living the best rest of my life.