Does Green Tea Have Caffeine? Everything You Need to Know
Yes — all green tea made from the Camellia sinensis plant contains caffeine naturally. It's not added; it's produced by the plant as a natural defence against insects. But the amount varies considerably based on the type of green tea, how it's processed, where it's grown, and how you brew it.
How Much Caffeine is in Green Tea?
A typical 250ml cup of brewed green tea contains between 25–50mg of caffeine — roughly half what you'd get from the same volume of coffee (usually 80–100mg). The exact amount depends on several variables:
- Matcha: You're consuming the whole leaf as powder, not just an infusion. Matcha delivers 60–80mg per serving; gyokuro (shade-grown, high-theanine Japanese green) can reach 120–140mg
- Standard brewed green tea: 25–45mg per cup, depending on leaf grade and brew time
- High-altitude whole-leaf green tea from Nepal's Ilam region: similar to standard brewed, but with a higher L-theanine content that moderates the caffeine's effect
- Hojicha, kukicha: Roasted or stem-heavy teas where much of the caffeine is volatilised during roasting — 15–25mg per cup
What L-Theanine Does to the Caffeine Experience
This is the key factor that distinguishes tea from coffee as a caffeine source. L-theanine is an amino acid found almost exclusively in Camellia sinensis. It crosses the blood-brain barrier and promotes calm alertness — specifically, it increases alpha brain wave activity (associated with relaxed focus) and moderates the cortisol spike that caffeine can trigger.
The practical result: green tea gives you focused alertness without the jittery edge that coffee's caffeine can cause. This is why many people describe the effect as "calm clarity" rather than stimulation.
High-altitude teas tend to have higher L-theanine concentrations than lower-elevation teas — the slower growth at high altitude means more L-theanine accumulates in the leaf. Nepal Hills' Floral Green Tea and Organic Light Green Tea, both from estates at 5,500+ feet in Nepal's Ilam region, have the naturally higher theanine-to-caffeine ratio that makes high-altitude teas particularly smooth as an energy source.
Factors That Change Caffeine Levels in Your Cup
Water temperature: Hotter water extracts caffeine faster and more completely. Brewing green tea at 75–80°C (lower than boiling) reduces caffeine yield compared to 90°C water, while also preventing the bitterness that over-hot water causes.
Steep time: Longer steeping = more caffeine. A 90-second steep at 75°C extracts significantly less caffeine than a 3-minute steep. You get less astringency too.
Second infusion: Caffeine is predominantly extracted in the first steep. The second infusion of the same leaves contains perhaps 20–30% of the original caffeine, with most of the flavour still present.
Cold brewing: Cold water extracts caffeine more slowly and less completely. Cold-brewed green tea (12 hours in the fridge) contains substantially less caffeine than the same tea brewed hot.
Is There Caffeine-Free Green Tea?
Not naturally. Any beverage made from Camellia sinensis leaves contains caffeine — it's an inherent property of the plant. "Decaf" green tea has been chemically processed to remove caffeine, and always retains trace amounts. If you want a completely caffeine-free option, herbal infusions (chamomile, rooibos, peppermint) are the answer — though these aren't technically teas.
Who Should Choose Lower-Caffeine Green Tea Options?
If you're caffeine-sensitive, pregnant, have sleep issues, or want to drink tea in the evening, the practical options are: cold-brewed green tea, short-steeped green tea at low temperature, or switching to white tea (15–30mg per cup). White tea from Nepal Hills — the Fresh White Tea or Floral White Tea — is the lowest-caffeine option in the true tea category.
Frequently Asked Questions
Does green tea have more or less caffeine than black tea?
Less. Black tea typically contains 40–70mg per cup; green tea typically contains 25–45mg. Both are substantially less than coffee (80–100mg).
Can I drink green tea at night?
Depends on your caffeine sensitivity. For most people, one cup of green tea in the early evening (before 7pm) doesn't noticeably affect sleep. If you're sensitive to caffeine, switch to white tea or an herbal infusion after 5pm.
Does steeping twice reduce caffeine enough to matter?
Yes. The second steep contains roughly 20–30% of the first steep's caffeine. If you're trying to minimise caffeine intake while still enjoying the flavour, a short first steep (discarded or a separate cup) followed by a longer second steep is a legitimate approach.
Why does high-altitude green tea feel smoother than supermarket green tea?
Two reasons: higher L-theanine content (moderating caffeine's edge) and whole-leaf processing (fewer bitter tannins released during steeping). The combination produces a noticeably smoother cup at the same caffeine level.
Is matcha stronger than loose leaf green tea?
Yes — significantly. Matcha uses the whole leaf ground into powder, so you consume all of the caffeine (and all of the L-theanine) rather than just what infuses into the water. A matcha serving delivers 60–80mg or more, comparable to a cup of coffee.