Not a nootropic per say but I've noticed a huge difference since focusing on my general health;

1) 7-8 hours sleep per night.

2) 1 hour of exercise per day (some days cardio, other days weights(focus on compounds; squat, deadlift, bench press, shoulder press, pullups, rows))

(for people thinking "I'm too busy to spend an hour of my day exercising". I think the productivity increase of clearing your head doing this exercise more than makes up for the hour it takes.)

3) balanced diet consisting of fresh natural foods. (fruit, veg, meat, fish etc. not frozen meals, microwave food where your not quite sure what's in it)

Found I've lost weight, cardiovascular endurance has increased, I'm stronger and just feel a lot better.

So my advice would be try and do all the above before taking any drugs that aren't very well researched and could cause long term issues.