While it hasn’t been long, two weeks, I haven’t noticed any discernible difference in mood or concentration etc. However, the worst pat is the taste of the capsules, which are atrocious. I could barely stomach getting them down the first time, but then I learned to hold my nose. Belching up the taste of dead fish throughout the morning is extremely unpleasant. I had two people at work ask if I had fish for breakfast which is quite embarrassing. It’s not a product for me.