Caffeine, a xanthine alkaloid compound, is a stimulant of central nervous system, which can temporarily dispel drowsiness and restore energy. It is used to treat neurasthenia and coma and resuscitation in clinic.
Coffee, tea, soft drinks and energy drinks containing caffeine are very popular, so caffeine is also the most widely used psychotropic drug in the world.
Therefore, it is safe to wake up buff in class, and whether to use it varies from person to person.
Early sugar production:
China is one of the earliest countries in the world to produce sugar. In the early stage, maltose and sucrose were dominant, and maltose played a greater role.