I've been carefully experimenting a bit.
5mg felt weak and short-lived
10mg a bit more noticeable
15mg seemed good dose, pronounced effect
It's brings extra sharpness, awareness, improved thinking, enhanced senses. There is also sort of a mental lift. I don't find these effects as strong as I've read other people describe though. I haven't quite concluded what Sunifram is best for. It's definitely a very potent nootropic, but I've also read some reports of negative effects like persisting headaches and impaired sleep. I always take neuroprotectives like Gotu Kola though. I'm gonna continue experiments at some point.