Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug.
Caffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).Caffeine can have both positive and negative health effects. It can treat and prevent the premature infant breathing disorders bronchopulmonary dysplasia of prematurity and apnea of prematurity.Caffeine can increase blood pressure and cause vasoconstriction.Coffee and caffeine can affect gastrointestinal motility and gastric acid secretion.
Reference
https://en.m.wikipedia.org/wiki/Caffeine
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