I noticed better retention, recall, fluid speech, increased pattern recognition. I went as high as 30mg daily, but after a while it too much and made me foggy at times and interfered with my sleep. After a long period of experimentation, I ave come to find that 10mg daily is milder and more subtle, but no fogginess or sleep issues. Now I just take 10mg on training days only and don't use it on rest days. I take it with 200mg caffeine and 250mg CDP Choline.