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.
Serotonin is a neurotransmitter, a chemical messenger found in the gut, blood, brain and nervous system. It transmits information and impulses across the spaces between the nerve cells, also known as neurons. Serotonin can have a huge impact on our mood, energy, attention, pain, hunger, weight and even our sex life.