Caffeine & Sleep
Soda

Caffeine in Coca-Cola Zero Sugar

34mg
per 12 oz
9% of FDA daily max

Is that a lot?

Coca-Cola Zero Sugar is 9% of the FDA’s recommended daily maximum, in a single 12 oz.

Green tea
28 mg
Coca-Cola Zero Sugar
34 mg
Espresso
63 mg
Red Bull
80 mg
Coffee
95 mg
FDA daily max · 400mg
Before bed

When can I drink Coca-Cola Zero Sugar and still sleep?

Your Coca-Cola Zero Sugar cutoff
You drink it at
Bedtime
Coca-Cola Zero Sugar · 34 mg · assuming an average ~5 h half-life
At bedtime
11 mg
close to optimal
Latest safe Coca-Cola Zero Sugar: 11:00 PM

How much caffeine is in Coca-Cola Zero Sugar?

Coca-Cola Zero Sugar matches Classic on caffeine at about 34 mg per 12 oz can, but strips the sugar to zero. You get the familiar cola taste and a light caffeine nudge without the 39-gram sugar load.

ServingCaffeineSugar
12 oz34 mg0 g

Will Coca-Cola Zero Sugar affect your sleep?

At 34 mg, Coke Zero begins below the 50 mg sleep-threshold and clears within a couple of hours. Its caffeine is light enough that an evening can rarely stands in the way of sleep.

Source: Manufacturer label

Related drinks

Coca-Cola Zero Sugar & sleep — FAQ

Unlikely, with about 34 mg of caffeine and no sugar, Coke Zero stays under the 50 mg threshold and shouldn't keep most people up at night.

Coca-Cola Zero Sugar has 34 mg per 12 oz — about 9% of the FDA’s 400 mg daily maximum for healthy adults.

It depends on your bedtime and how fast you clear caffeine. Use the calculator above to see when Coca-Cola Zero Sugar drops below the ~50 mg “ok to sleep” threshold for your bedtime.

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