How much caffeine is in GU Energy Gel?
One packet of GU Energy Gel (caffeinated flavors) has 20 mg of caffeine.
That's about a quarter of a cup of brewed coffee, and 5% of the 400 mg a day the FDA cites for most healthy adults.
Source: guenergy.com · checked 10 Nov 2026
When did you have it?
Had at 3 pm, about 6.9 mg is still in you at an 11 pm bedtime. That should not affect most people’s sleep.
Your whole day, every drink, in the free CaffeineIQ check. The iPhone app is coming soon.
Sizes
| Size | Volume | Caffeine | mg per fl oz |
|---|---|---|---|
| 1 packet, caffeinated flavors shown above | 20 mg | ||
| 1 packet, high-caffeine flavors | 40 mg |
Source: guenergy.com · checked 10 Nov 2026
Latest time to drink it
For an 11 pm bedtime, one packet of GU Energy Gel (caffeinated flavors) stays under the 50 mg most people sleep fine with, even late in the evening. 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 | Any time | Any time | Any time |
| 10 pm | Any time | Any time | Any time |
| 11 pm | Any time | Any time | Any time |
| Midnight | Any time | Any time | Any time |
| 1 am | Any time | Any time | Any time |
For one packet of GU Energy Gel (caffeinated flavors), 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 one packet of GU Energy Gel (caffeinated flavors) peaks in your blood about 70 minutes after you start it, at roughly 17 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 | 14 mg | 9.2 mg | 6 mg | 4 mg |
So one had at 3 pm leaves about 6.9 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
GU Energy Gel is stronger than 11% of the 10 gums, gels and other products we track, by caffeine per serving.
To reach 400 mg in a day you would need about 20 of these.
Less caffeine
- Coffee Liqueur 12 mg, 1 shot
More caffeine
- Jägerbomb 40 mg, 1 drink
- Neuro Gum 40 mg, 1 piece
- Grinds Coffee Pouch 55 mg, 1 pouch
FAQ
Is GU Energy Gel high in caffeine?
No, it is low. One packet of GU Energy Gel (caffeinated flavors) has 20 mg, which is 21% of the 95 mg in an 8 fl oz cup of brewed coffee.
How much caffeine is in 1 packet, high-caffeine flavors of GU Energy Gel?
One packet of GU Energy Gel (high-caffeine flavors) has 40 mg of caffeine.
Can I drink GU Energy Gel at night?
For most people, yes: even late in the evening one packet of GU Energy Gel (caffeinated flavors) stays under 50 mg at an 11 pm bedtime.
How long does the caffeine in GU Energy Gel last?
It peaks about 70 minutes after you start it. Of the 20 mg, about 9.2 mg is still in you 6 hours later and 4 mg after 12 hours, for an average adult with a 5-hour half-life.
Does GU Energy Gel have more caffeine than a cup of coffee?
No. One packet of GU Energy Gel (caffeinated flavors) has 20 mg; an 8 fl oz cup of coffee has 95 mg.
Method and limits
The caffeine figure comes from guenergy.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.
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