It's not really new. It's been around for a while. These are my personal experiences. I only take it about once or twice a week on average. I've heard that

It's not really new. It's been around for a while. These are my personal experiences. I only take it about once or twice a week on average. I've heard that you can build up a resistance and it becomes less effective over time. I only take it when I have something I'm working on and want a boost. It removes the brain fog and gives you a very slight euphoria. It is a dopamine reuptake inhibitor but that is not the only or primary mechanism that makes it work as a cognitive enhancer. You feel very motivated and focused. Just make sure to take it first thing in the morning or you won't be able to sleep that night. It is not addictive and doesn't have a crash. At least for me, it has a similar effect as when you boost testosterone through exercise with heavy weights or abstaining from any sexual activity (increased motivation and focus). That being said, the most overlooked and most effective cognitive enhancers is SLEEP!