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A naturally occurring hormone produced in the body, which promotes sleep at certain times in the day based on the circadian rhythm. It is also commonly available as a drug to treat insomnia and promote a proper sleep cycle. It can be used to promote sleepfulness at the tail-end of drug experiences, though it is not particularly hypnotic.
Nootropics, otherwise known as "Smart Drugs" or "Cognitive Enhancers," are substances that can improve cognitive function, memory, creativity, motivation and can also aid in decreasing anxiety.
Common drugs are those which are well known and widely used among the drug community. This doesn't necessarily mean they are safe, but it usually comes with a longer relative history of use in humans with which to establish a safety profile.
No interaction information for Melatonin