Celsiusに含まれるカフェイン量はどれくらい？

A 355 ml (12 fl oz) can of Celsius contains 200 mg of caffeine. With a concentration of 56.3 mg per 100 ml, it delivers a caffeine punch that is just over twice the per-volume strength of a typical mug of drip coffee (96 mg per 240 ml). That 200 mg figure represents exactly half of the FDA’s 400 mg daily guidance for healthy adults.

For most consumers, a single Celsius provides a pronounced stimulant effect. Caffeine enters the bloodstream within 10–15 minutes, peaks at 30–60 minutes, and promotes alertness by blocking adenosine receptors. At 200 mg, the effect is comparable to about two shots of espresso (63 mg each) or a large strong coffee. The brand markets the drink as a pre-workout and fitness companion, and the addition of ingredients like green tea extract, guarana, and taurine—although these add minimal extra caffeine beyond what is on the label—contributes to a perception of sustained energy.

People who are sensitive to caffeine or who rarely consume stimulants should approach this dose with caution. The body takes several hours to clear 200 mg, and even half can remain in the system long after the subjective alertness fades. The following sections explain exactly how caffeine from one Celsius moves through the body, how the drink stacks up against other energy drinks, and where the 200 mg number comes from.

Celsiusが体内にどれくらい残るか

Caffeine elimination follows a first-order exponential decay with a population-average half-life of 5.7 hours (EFSA, 2015). Starting from the 200 mg dose in a Celsius, the arithmetic works as follows: after 3 hours, approximately 200 × 0.5^(3/5.7) = 139 mg remains in circulation; after 6 hours, 200 × 0.5^(6/5.7) = 96 mg; after 9 hours, 200 × 0.5^(9/5.7) = 67 mg; and after 12 hours, 200 × 0.5^(12/5.7) = 46 mg. Because 5.7 hours is a mean figure, individuals with slower clearance—often due to genetics, liver function, or oral contraceptive use—will see even higher residual levels at each time point.

To put timing into context: someone who drinks a Celsius at 15:00 will still have roughly 67 mg in their body at 21:00, an amount comparable to a double espresso. According to research by Drake et al. (2013, Journal of Clinical Sleep Medicine), a 400 mg dose taken six hours before bed still cost participants more than an hour of sleep. While 67 mg is significantly less, it can linger enough to disturb sleep onset or deep-sleep quality, especially in people with a high sensitivity to caffeine. If sleep is a priority, finishing a Celsius by early afternoon is a prudent benchmark, and the interactive latest cup before bedtime tool lets you model a personalised cutoff.

With a 200 mg dose, a single Celsius fills exactly half of the FDA’s 400 mg daily guidance for healthy adults. A second can would reach the limit entirely, leaving no margin for coffee, tea, chocolate or any other caffeine source. The EFSA (2015) also states that habitual caffeine intakes of up to 400 mg per day do not raise safety concerns for healthy adults, but singles out 200 mg as the dose that should not be exceeded in a single sitting for pregnant women, who are advised to keep total daily intake under 200 mg. For adolescents, a common guideline is 2.5–3 mg per kilogram of body weight, which means a 50-kg teenager should consume no more than about 125-150 mg in a day—less than one full Celsius can.

When planning consumption around a 23:00 bedtime, the decay curve suggests that a 200 mg dose taken at 15:00 will still leave approximately 67 mg circulating at 21:00 and about 46 mg at midnight. This is enough to delay sleep onset and reduce slow-wave sleep, especially in caffeine-sensitive individuals. To minimise sleep interference, a practical rule of thumb is to treat 12:00–13:00 as the latest cutoff for a full-dose Celsius; by 23:00, the remaining caffeine drops below 50 mg—similar to what you might get from a small cup of tea. You can explore your own personal cutoff with the latest cup before bedtime tool, which uses body weight and target bedtime to give a more personalised suggestion. For a deeper understanding of how much caffeine your body can handle daily, the safe daily limit by body weight calculator translates the same 5.7-hour half-life model into a milligrams-per-day number.

Among energy drinks available in the same retail channels, a 355 ml Celsius with its 200 mg sits firmly in the upper tier. It contains more caffeine than a 355 ml Red Bull (114 mg) and the standard 473 ml Monster Energy (160 mg) or Monster Ultra (150 mg). In fact, it matches the 200 mg of Prime Energy (355 ml) and even the concentrated 5-Hour Energy shot (200 mg in just 57 ml), but the latter delivers a far more intense per-millilitre hit. The heaviest-hitting competitors remain Bang and Reign, both packing 300 mg into a 473 ml can, giving them a 50% higher absolute dose and a slightly higher concentration (63 mg per 100 ml vs Celsius’ 56 mg per 100 ml).

When viewed against common coffee benchmarks, the Celsius can stands in for about 2.1 cups of home-brewed drip coffee, assuming a 240 ml cup contains 96 mg of caffeine. It also equals roughly three single shots of espresso (63 mg each) or seven 240-ml cups of green tea (28 mg each). The concentration of 56.3 mg per 100 ml is significantly higher than that of typical filter coffee (40 mg per 100 ml), so drinking a 355 ml can feels more intense than sipping an equal volume of coffee over the same period. That is one reason Celsius markets itself for quick, functional energy rather than the drawn-out ritual of a coffee break. The side-by-side drink comparison tool lets you plot Celsius against any other beverage in the dataset, making the relative strength easy to see.

Within the broader energy-drink landscape, the 200 mg dose represents a deliberate step beyond conventional 160 mg “full-size” cans but stops short of the extreme 300 mg segment. For someone who finds a 160 mg Monster insufficient but wants to avoid the jitteriness that can accompany 300 mg, a Celsius gives a middle ground. Nevertheless, at 200 mg it already accounts for half of the FDA-recommended daily maximum, so a second can would hit exactly 400 mg—meaning there is no room for other caffeine sources if you want to stay within the guidance. For a more detailed look at how energy-drink caffeine stacks up, see the Energy Drink Caffeine: Comprehensive Comparison Chart guide on our site.

Celsiusの数値を左右する要素

The 200 mg figure applies to virtually every ready-to-drink (RTD) product in the Celsius core lineup. Unlike energy drink brands that vary caffeine by can size or flavour, Celsius maintains a standardised 200 mg dose across its sparkling cans, whether Orange, Kiwi Guava, or Wild Berry. The same holds for the Celsius BCAA and Celsius Stevia ranges: each 355 ml (12 fl oz) can contains exactly 200 mg of caffeine. The consistency is a deliberate branding choice, positioning every Celsius product as a uniform “functional energy” serving.

• Classic and Sparkling lines: 200 mg per 355 ml can
• Celsius Heat: also 200 mg per 355 ml can, with added thermogenic ingredients
• Celsius BCAA: 200 mg per 355 ml can
• Celsius Stevia: 200 mg per 355 ml can
• Celsius On-the-Go (powder): 200 mg per packet, mixed with water

Because the product line-up shows no lower-caffeine or decaffeinated option, consumers who want a milder lift have no Celsius-branded alternative. The company does not currently offer a half-dose format—contrast with some coffee-shop chains that let you choose a single vs double shot. That uniformity is a convenience for habitual buyers who want a predictable effect every time, but it removes the ability to self-titrate with the same brand. Anyone seeking a dose closer to 100 mg would need to look at smaller cans of Red Bull (114 mg per 355 ml) or split a Celsius powder packet, which is tricky to do precisely.

It is worth noting that while the caffeine content is tightly controlled, the overall experience can feel different across products because of the non-caffeine components. Celsius Heat, for instance, includes cayenne pepper extract, while the classic line uses green tea extract and guarana. Yet those plant-based ingredients do not materially alter the caffeine total because the caffeine they contribute is already accounted for in the 200 mg number; the label declares the combined caffeine from all sources. So for the purpose of calculating caffeine intake, the 200 mg figure is reliable across the entire range.

この数値の出典

The 200 mg figure used throughout this page comes directly from the nutrition label and ingredient panel published by Celsius Holdings, Inc. In the United States, the FDA requires that caffeine content declared on a product label be accurate within reasonable enforcement tolerances, and energy-drink manufacturers have little incentive to misstate a value that is both a selling point and a safety signal. Unlike coffee, where caffeine varies with bean origin, roast, grind, and brew method, a formulated energy drink like Celsius is mixed in large, controlled batches, making the dose per can highly reproducible. That is why our dataset treats the label claim as the true value.

Discrepancies do sometimes appear when independent laboratories test energy drinks, but for major brands the variation is usually within a few milligrams—small relative to the 200 mg total. If a future lab report or a change in the product formulation were to show a consistent deviation, we would update the number and note the date of change. Until then, the best available evidence says a 12-oz Celsius can delivers 200 mg of caffeine. The full, open behind-the-scenes caffeine dataset explains our methodology for collecting and verifying figures across hundreds of beverages.

結論

A standard 355 ml (12 fl oz) can of Celsius contains 200 mg of caffeine, exactly half of the FDA and EFSA 400 mg daily maximum for healthy adults. In coffee terms, that equals roughly 2.1 cups of home-brewed drip coffee (at 96 mg per 240 ml) or three single shots of espresso (63 mg each). The dose is the same across all Celsius sparkling cans, powder sticks, and functional lines like Heat and BCAA, so there is no brand-provided way to get a smaller increment.

With a typical six-hour half-life, the body still holds about 96 mg six hours after consumption, meaning a midafternoon Celsius can leave a meaningful caffeine load at bedtime. Because two cans hit the upper daily limit exactly, the drink is best treated as a once-per-day source of caffeine. For personalised guidance on how a Celsius fits into your routine, the tools on this site let you model your own caffeine clearance and compare it against hundreds of other drinks.