Here you can take a look at the scientific studies of various anxiolytic, nootropics, and performance enhancing drugs.
Anxiolytics is the drugs that is used to treat anxiety disorders. As of today, most commonly used anti-anxiety drugs are benzodiazepine tranquilizers. However, they have numerous side effects and is known to impair cognitive functions and form addiction.
There is also an alternative to benzodiazepines, such as afobazole, stresam, adaptol, and selank. Although they might have less pronounced anxiolytic action, these anxiolytic drugs does not impair cognition and is non habit-forming.
Nootropics (also known as cognitive enhancers) is the drugs that are used to improve cognitive functions, such as memory, attention, and logical thinking. Most widely used cognitive enhancers are racetams (e.g Piracetam, Phenylpiracetam, Noopept), semax, cerebrolysin, and various stimulant drugs such as modafinil and adderall.
Performance enhancers is the drugs that are used to improve physical performance. They are often used by athletes, though some drugs of this class such as Phenylpiracetam (Phenotropil), Mildronate and Bromantane (Ladasten) is banned by WADA.