Is the russian medicine noopept (considered a dietary supplement in the usa) safe to take long term for improved memory? how does it work?

Save your money: Noopept is similar to piracetam, which doesn't work, and no real evidence that this does either. If you wish to look at cognitive alternative preps, consider phosphatidyl-serine, Alpha lipoid acid, n-acetyl cysteine, but these are used more often in older patients. Consult with your doctor if you have friends or family who are developing cognitive losses.