How much caffeine is in G FUEL Energy Formula?

One scoop of G FUEL Energy Formula has 140 mg of caffeine.

That's about one and a half cups of brewed coffee, and a third of the 400 mg a day the FDA cites for most healthy adults.

Source: gfuel.com · checked 10 Nov 2026

When did you have it?

Had at 3 pm, about 49 mg is still in you at an 11 pm bedtime. That should not affect most people’s sleep.

Bedtime

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Latest time to drink it

For an 11 pm bedtime, most people should finish one scoop of G FUEL Energy Formula by about 3:10 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	8:10 am	1:10 pm	6:10 pm
10 pm	9:10 am	2:10 pm	7:10 pm
11 pm	10:10 am	3:10 pm	8:10 pm
Midnight	11:10 am	4:10 pm	9:10 pm
1 am	12:10 pm	5:10 pm	10:10 pm

For one scoop of G FUEL Energy Formula, 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 scoop of G FUEL Energy Formula peaks in your blood about 70 minutes after you start it, at roughly 120 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	97 mg	64 mg	42 mg	28 mg

So one had at 3 pm leaves about 49 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

G FUEL Energy Formula is stronger than 39% of the 34 supplements and medicines we track, by caffeine per serving.

To reach 400 mg in a day you would need about 3 of these.

Less caffeine

Amino Energy 100 mg, 1 serving
Ergotamine and Caffeine (Cafergot) 100 mg, 1 tablet
BC Powder 65 mg, 1 powder packet

More caffeine

C4 Ripped 150 mg, 1 scoop
Goody's Hangover Powder 150 mg, 1 powder packet
Goody's Mental Alert Powder 150 mg, 1 powder pack

FAQ

Is G FUEL Energy Formula high in caffeine?

Yes. One scoop of G FUEL Energy Formula has 140 mg, which is 1.5 times an 8 fl oz cup of brewed coffee (95 mg).

Can I drink G FUEL Energy Formula at night?

Not if you want to sleep well. Had at 7 pm, it leaves about 85 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 3:10 pm.

How long does the caffeine in G FUEL Energy Formula last?

It peaks about 70 minutes after you start it. Of the 140 mg, about 64 mg is still in you 6 hours later and 28 mg after 12 hours, for an average adult with a 5-hour half-life.

Does G FUEL Energy Formula have more caffeine than a cup of coffee?

Yes. One scoop of G FUEL Energy Formula has 140 mg; an 8 fl oz cup of coffee has 95 mg.

Method and limits

The caffeine figure comes from gfuel.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.