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.
Around 95 percent of the body's serotonin is produced in the intestinal tract, says Dr. Chait. While the serotonin in your brain regulates mood, in the gut, it promotes the growth of nerve cells and alerts the immune system to foreign invaders like viruses and bacteria.