There is a common perception that "black tea has a strong caffeine content," but it is actually lower than coffee when comparing the same amount. Although the tea leaves themselves contain a lot of caffeine, the amount used per cup is small, and the extraction rate is also modest.
Caffeine Content by Beverage
| Beverage (150ml) | Approximate Caffeine Content |
|---|---|
| Drip Coffee | About 90mg |
| Black Tea | About 30mg |
| Green Tea (Sencha) | About 30mg |
| Hojicha / Genmaicha | About 20mg |
| Barley Tea / Rooibos Tea | 0mg (Caffeine-free) |
These values are approximate. They can vary based on the amount of tea leaves, steeping time, and water temperature; the longer and stronger the brew, the more caffeine will be extracted.
How to Manage Caffeine Intake
- Don’t want to disrupt sleep: Limit intake a few hours before bedtime. Switching to decaf or caffeine-free options (rooibos, barley tea, herbal tea) in the evening is recommended.
- Shortening the steeping time will also reduce the caffeine extracted (though it may lighten the flavor as well).
- Milk tea softens the stimulation with milk, making it smoother to drink.
Guidelines for Pregnant Women, Nursing Mothers, and Children
Caffeine sensitivity varies from person to person, and special care is needed for pregnant women, nursing mothers, and children. Health organizations in various countries suggest a caffeine intake limit of about 200-300mg per day during pregnancy (which corresponds to several cups of black tea). If you are concerned, choosing decaf or caffeine-free options can provide peace of mind. For specific intake amounts, please consult your doctor or midwife.
What is Decaf?
Decaf refers to black tea from which a significant amount of caffeine has been removed. The main methods of decaffeination include:
- Water Process: A method that extracts caffeine using water. It tends to retain flavor without using chemicals.
- Carbon Dioxide (CO₂) Method: A method that removes only caffeine using high-pressure carbon dioxide. It helps preserve flavor.
"Decaf" does not mean completely caffeine-free; it means significantly reduced caffeine, while "caffeine-free" refers to beverages that do not contain caffeine at all (such as rooibos, barley tea, and many herbal teas). Choose according to your needs.