The common cold is the most frequent infection a person will ever encounter, and it is estimated that there are more than 220 different cold viruses that infect humans. After exposure, it normally takes one to three days for illness to start— duration of a cold is usually seven days, but in some cases, it can last several weeks. The same virus never infects the same person twice, and while there is no cure for the common cold, there are ways to prevent infection, using natural treatments.

Nootropic is a term used to describe so-called “smart drugs” or “smart supplements” that can improve cognitive function.