- 一般的に知られていること
- Caffeine is a bitter stimulant that occurs naturally in more than 60 plants, including coffee beans, tea leaves, kola nuts, and cacao pods, and is also added to some drinks and medicines.
- 摂取が多いとき
- High caffeine intake is commonly discussed in relation to restlessness, a fast heart rate, and trouble sleeping; MedlinePlus notes that up to 400 mg a day is not harmful for most healthy adults, while sensitivity varies from person to person.