Therefore, if you're planning a long journey, you should always apply for the Russian visa before you leave. It's possible to get a tourist visa support at any moment before your journey, however, you can only apply for a tourist visa not earlier than 90 days before the date of your first entry to Russia.
Serotonin is a common neuromediator in the brain. It belongs to the group of so-called biogenic amines, relatively simple chemicals that facilitate the transfer of signals between the cells of the body.
1 Serotonin that is used inside the brain must be produced within it. 2  It is thought that serotonin can affect mood and social behavior, appetite and digestion, sleep, memory and sexual desire and function.