How Much Caffeine Should Gamers Have in a Day?

This is the third time I've written about caffeine numbers specifically, alongside the safety post and the sugar tax roundup, and I don't think that's overkill.

Gamers, more than most people, tend to stack caffeine without tracking it. A coffee in the morning, an energy drink at lunch, then gummies before an evening session, and suddenly you're well past where you meant to be without noticing.

How much caffeine is in coffee, tea and energy drinks?

A few things that skew these numbers in practice.

Coffee shop coffee is usually stronger than the table suggests. A large filter coffee from a chain can hit 200mg or more on its own, and a two-shot flat white lands around 130mg. If your morning coffee is a takeaway rather than something you made, assume the higher end.

Decaf isn't zero. It's typically 2mg to 5mg per cup, which is negligible but not nothing across several cups.

And cans vary wildly by size. A 500ml can is often double the 250ml figure in that table, so check the volume rather than assuming a can is a can.

Stacking caffeine across a gaming day

The mistake I see most often isn't any single source being too strong. It's not adding them up.

That ceiling comes from the European Food Safety Authority's 2015 caffeine assessment: up to 400mg spread across the day, and single doses up to 200mg, don't raise safety concerns for healthy adults. The UK Food Standards Agency gives the same figures for caffeine supplements. A coffee at 9am, a can at 2pm, and gummies at 7pm before an evening session can easily push someone towards, or past, that 400mg ceiling without them noticing it happening in real time.

Here's what that looks like as a worked example:

Nothing in that day feels excessive on its own. The total is well past guidance, and the 7pm dose is still working at midnight.

A simple approach that works well: pick one or two main caffeine sources for the day and plan around them, rather than reaching for whatever's nearest whenever you feel a dip. If you know you're taking a Levelz® serving before an evening session, that's a good cue to keep earlier coffee intake lighter rather than stacking a full day of coffee on top.

Why does the evening dose matter most?

Caffeine's half-life is often quoted at around five hours, though it varies a lot between people. Genetics, smoking, hormones and some medicines all change how fast you clear it, as a 2018 review of caffeine metabolism sets out. Either way, a good share of a 7pm dose is still in your system at midnight.

You can fall asleep with caffeine in your system. What changes is how well and how long you sleep, and you often won't connect a rough morning to the dose you took eleven hours earlier. EFSA notes that even 100mg may affect sleep in some adults when taken close to bedtime.

That's the loop worth watching. Poor sleep leads to more caffeine the next day, which leads to worse sleep, and after a week you're taking more and feeling less. The fix is boring and it works: keep the last dose of the day at least six hours before you want to be asleep. That's the gap a 2013 sleep study tested, and even then a large dose still cut into sleep, so treat six hours as the minimum rather than a guarantee.

Sensible guidance for a gaming day

• Know roughly how much caffeine is in your regular sources, not just an estimate
• Space sources out across the day rather than clustering them close together
• Be more cautious in the evening if you're planning to sleep at a normal hour afterwards
• Factor in body weight, tolerance and any sensitivity you personally have, since 400mg is general guidance, not a personal prescription
• If you notice jitteriness, a racing heart or trouble sleeping, that's a signal to scale back your total, not just switch sources

That fourth point deserves emphasis. 400mg is a population-level figure. Some people feel rough at half that. Others handle more without issue. Neither is a failing, and your own tolerance is better information than a general number.

If you're pregnant, the guidance is considerably lower: the NHS says no more than 200mg a day. And if you're under 18, EFSA's guidance is based on body weight (3mg per kilogram a day), which for most teenagers is well below the adult figure. That's why {EXT:faq:Levelz® isn't for you}.

FAQ

In short

400mg a day is the general adult ceiling and one Levelz® serving is 150mg of it. The risk isn't any single source, it's the running total across a day nobody adds up. Pick your main sources, know their real numbers rather than guessing, keep the last dose six hours clear of bedtime, and treat 400mg as a guide rather than a target. Lower if you're pregnant. Not at all if you're under 18.

For the fuller safety picture beyond the numbers, are energy gummies safe for adults covers who shouldn't take them and what to watch for.

Our FAQ page has the complete caffeine and ingredient breakdown, and you can see exact dosing on the product pages.

Sources

1. European Food Safety Authority (EFSA), Caffeine (summary of the Scientific Opinion on the safety of caffeine, EFSA Journal 2015;13(5):4102), EFSA, 2015.
2. Food Standards Agency, Food supplements containing caffeine, GOV.UK, 2024.
3. NHS, Foods to avoid in pregnancy (caffeine), NHS website.
4. Drake C, Roehrs T, Shambroom J, Roth T, Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed, Journal of Clinical Sleep Medicine, 2013.
5. Nehlig A, Interindividual differences in caffeine metabolism and factors driving caffeine consumption, Pharmacological Reviews, 2018.