How much caffeine is in gyokuro?
100 ml of gyokuro (brewed) has 160 mg of caffeine.
That's about one and a half cups of brewed coffee, and 40% of the 400 mg a day the FDA cites for most healthy adults.
Source: itoen-global.com · checked 10 Nov 2026
When did you have it?
Had at 3 pm, about 56 mg is still in you at an 11 pm bedtime. That might affect your sleep.
Your whole day, every drink, in the free CaffeineIQ check. The iPhone app is coming soon.
Latest time to drink it
For an 11 pm bedtime, most people should finish 100 ml of gyokuro (brewed) by about 2:05 pm. The table works it out for other bedtimes and for how sensitive you are: it is the latest time to start one so that the caffeine left stays under the line all night.
| Bedtime | Very sensitive under 25 mg | Average under 50 mg | Not very sensitive under 100 mg |
|---|---|---|---|
| 9 pm | 7:05 am | 12:05 pm | 5:05 pm |
| 10 pm | 8:05 am | 1:05 pm | 6:05 pm |
| 11 pm | 9:05 am | 2:05 pm | 7:05 pm |
| Midnight | 10:05 am | 3:05 pm | 8:05 pm |
| 1 am | 11:05 am | 4:05 pm | 9:05 pm |
For 100 ml of gyokuro (brewed), average clearance (half-life 5 h), 8 hours of sleep. "Any time" means even one at bedtime stays under the line.
How long it lasts
The caffeine from 100 ml of gyokuro (brewed) peaks in your blood about 75 minutes after you start it, at roughly 137 mg. Half of it is gone in about 5 hours for an average adult; that ranges from roughly 3 to 7 hours, and longer in pregnancy or with some medicines.
| Time after | 3 hours | 6 hours | 9 hours | 12 hours |
|---|---|---|---|---|
| Still in you | 112 mg | 74 mg | 49 mg | 32 mg |
So one had at 3 pm leaves about 56 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
Gyokuro is stronger than 100% of the 38 teas we track, by caffeine per serving.
Per fluid ounce (47 mg) it is stronger than 100% of them.
To reach 400 mg in a day you would need about 2½ of these.
Less caffeine
- Iced Tea 99 mg, 1 medium drink
- Sweet Tea 92 mg, 1 medium drink
- Bigelow American Breakfast Tea 60 to 90 mg, 1 cup
FAQ
Is gyokuro high in caffeine?
Yes. 100 ml of gyokuro (brewed) has 160 mg, which is 1.7 times an 8 fl oz cup of brewed coffee (95 mg).
Can I drink gyokuro at night?
Not if you want to sleep well. Had at 7 pm, it leaves about 98 mg in an average adult at an 11 pm bedtime, above the 50 mg most people sleep fine with. The latest time for an 11 pm bedtime is about 2:05 pm.
How long does the caffeine in gyokuro last?
It peaks about 75 minutes after you start it. Of the 160 mg, about 74 mg is still in you 6 hours later and 32 mg after 12 hours, for an average adult with a 5-hour half-life.
Does gyokuro have more caffeine than a cup of coffee?
Yes. 100 ml of gyokuro (brewed) has 160 mg; an 8 fl oz cup of coffee has 95 mg.
Method and limits
The caffeine figure comes from itoen-global.com; recipes, brewing and batches vary, so a real serving can differ. The curves use a standard one-compartment model with an average 5-hour half-life and a sleep-friendly line of 50 mg; your own body may clear caffeine faster or slower. How it works has the details.
These are estimates for information, not medical advice.