Coffee contains nicotinic acid, which is a type of vitamin B. Drinking coffee can supplement the nutrition of vitamin B. Coffee also contains free fatty acids, caffeine, tannic acid and other substances that can be absorbed by the human body.
Coffee can eliminate fatigue. The caffeine in coffee can excite nerves and make people less tired.
Coffee is helpful to patients with constipation because it is beneficial to the body's metabolism and promotes the excretion of waste.