5 stars for quality! I put a scoop under my tongue after every meal and I've noticed I can focus for longer periods of time. I work as an analyst, and I find resolving problems to come a lot easier. If you really want to put noopept to the test, try studying a subject you're not familiar with and then test your ability to recall it. There is no 'buzz' you're going to feel from this product if that's what you're looking for and there is no product that is going to suddenly give you a gift of knowledge.
The only thing that would make me give any less than 5 stars would be due to the packaging. There are no problems with the seal.