Key takeaways
- Green tea: ~25–45 mg.
- Coffee: ~80–100 mg.
- Limit: ~400 mg a day.
- Drink before early afternoon.
- Count Black Wood Tea in your total.
Caffeine can be a great tool for energy and focus when you use it wisely.
Caffeine by drink (approx. per 8 oz)
| Drink | Caffeine |
|---|---|
| Green tea | 25–45 mg |
| Oolong tea | 30–50 mg |
| Black tea | 40–70 mg |
| Brewed coffee | 80–100 mg |
| Energy drink (8 oz) | 70–100+ mg |
Amounts vary with brand, brew time and serving size.
The L-theanine effect
Tea naturally contains L-theanine, an amino acid that may smooth out caffeine's effects, supporting calm, focused alertness rather than jitters.
Timing tips
- Have caffeine before early afternoon to protect sleep
- 30–60 minutes before a workout for a boost
- Avoid stacking several caffeine sources
Who should limit caffeine
- People with heart rhythm problems or high blood pressure
- People with anxiety or insomnia
- People taking certain medicines (ask your pharmacist)
Black Wood Tea contains caffeine from guarana, green tea and oolong tea. The amount per bag isn't listed in the materials we have, so count it toward your daily total and avoid other stimulants on the same day.
Seek care for a racing heart, chest pain or dizziness after caffeine.
Sources
- U.S. FDA – "Spilling the beans: how much caffeine is too much?"
- USDA FoodData Central – caffeine values.
- Mayo Clinic – "Caffeine content for coffee, tea, soda and more."
Common questions
How much caffeine is in green tea?
About 25–45 mg per 8-oz cup.
How much caffeine is safe per day?
Up to about 400 mg for most healthy adults.
Does Black Wood Tea contain caffeine?
Yes, from guarana, green tea and oolong tea.