Red Bull 카페인: 캔마다 얼마나 들어 있나?

A 250 ml can of Red Bull contains 80 mg of caffeine.

• 80 mg — caffeine in a standard 250 ml Red Bull can (32 mg/100 ml).
• 114 mg — caffeine in the 355 ml Red Bull can (32.1 mg/100 ml).
• 48% — roughly the fraction of a dose remaining after 6 hours (population average half-life ≈5.7 h).
• 400 mg/day — FDA's recommended caffeine upper limit for healthy adults; pregnancy guidance is ~200 mg/day.

Caffeine amount in standard Red Bull cans

Red Bull is sold in at least two common single-serve sizes in data sources: a 250 ml can with 80 mg of caffeine and a 355 ml can with 114 mg. The product's concentration is about 32 mg of caffeine per 100 ml, so the larger can scales proportionally.

How Red Bull compares to coffee and other energy drinks

Put the numbers side-by-side to see what one can does relative to coffee and other energy products. These are dataset values; use them to match consumption to your daily limit.

Practical comparisons

A single 250 ml Red Bull (80 mg) has less caffeine than a typical 240 ml cold brew (200 mg) or a 473 ml Starbucks Pike Place (310 mg). It has about the same caffeine as a strong single espresso (63 mg) plus a small extra margin. For many people one Red Bull is a moderate dose; stacking multiple cans or combining with coffee quickly reaches the FDA 400 mg limit.

How long Red Bull's caffeine lasts (decay math)

Caffeine elimination follows population-average kinetics with a half-life ≈5.7 hours. That means roughly 69% of a dose remains after 3 hours, 48% after 6 hours, 33% after 9 hours and 23% after 12 hours. Below are concrete numbers for common doses.

Use these numbers to time consumption: for example, an 80 mg can drunk at 6 p.m. leaves roughly 38 mg at midnight—enough in sensitive people to affect sleep. If you track intake, a log (for example CoffeeLog) will compute cumulative residual caffeine automatically.

Ingredients, formulation and what affects caffeine content

Red Bull's active stimulant is caffeine; the beverage also contains ingredients like taurine and B‑vitamins plus sugar or sweeteners depending on the variant. The caffeine content is set during manufacturing, so unlike brewed coffee it doesn’t vary much by 'brew' technique. For coffee, brewing method (cold brew, pour‑over, espresso) and serving size cause far larger variability — see the comparison table.

Health considerations and safe daily limits

Regulatory and clinical guidance sets conservative limits: the U.S. FDA cites 400 mg/day as an upper limit for most healthy adults; many authorities (including EFSA) provide similar guidance. For pregnancy, agencies commonly recommend approximately 200 mg/day—pregnant people should consult their clinician and count all sources. The American Academy of Pediatrics discourages energy drinks for children and adolescents because of possible cardiac and neurobehavioral effects.

Acute overconsumption risks include palpitations, tremor, anxiety, GI upset and, at very high doses, arrhythmias or seizures; seek emergency care if someone ingests a very large amount or has severe symptoms. Withdrawal after stopping regular caffeine can cause headache, fatigue and irritability; taper if you are reducing intake.

Timing, stacking and practical guidance

• Space doses: with a 5.7 h half‑life, expect about half of a Red Bull’s caffeine to clear every ~5–6 hours; stacking multiple cans within a few hours multiplies residual amounts.
• Before sleep: avoid caffeine within 6–8 hours of bedtime if you’re sensitive—an 80 mg can can leave 38 mg or more at bedtime and impair sleep.
• Combine sources: count coffee, tea, cola, pills and pre‑workout. A single Starbucks Pike Place (310 mg) plus a 250 ml Red Bull could exceed 400 mg.
• Track intake: use an app like CoffeeLog to record servings and see cumulative caffeine and expected residuals over time.

Final notes and sources

Numbers above use the dataset caffeine values for beverages and the population-average caffeine half-life (≈5.7 h). Authoritative sources for health guidance include the U.S. Food and Drug Administration (FDA), European Food Safety Authority (EFSA), USDA FoodData Central for food composition, and clinical guidance from organizations such as the American Academy of Pediatrics and Mayo Clinic. This page is informational only and not medical advice—consult a healthcare provider for personalized recommendations.

If I drink two 250 ml Red Bull cans 4 hours apart, how much caffeine will be in my body right after the second can?

Immediately after the second 250 ml Red Bull (drunk 4 hours after the first), you will have about 129 mg of caffeine present in your body: the first 80 mg has decayed to roughly 49.2 mg and the fresh 80 mg adds on top for 49.2 + 80 = 129.2 mg. First-order elimination is a process where the amount of a substance declines by a constant fraction per unit time; the dataset uses a population-average half-life of 5.7 hours (342 minutes) for caffeine.

Calculation details: remaining from the first can after 4 h = 80 × 0.5^(4/5.7) ≈ 80 × 0.615 = 49.2 mg; add the second 80 mg → ≈129.2 mg total. If you wait another 6 hours after the second can (10 hours after the first), the second can contributes 80 × 0.5^(6/5.7) ≈ 38.6 mg and the first contributes 80 × 0.5^(10/5.7) ≈ 23.7 mg, leaving ≈62.3 mg total.

How much caffeine will be left if I drink a Red Bull in the morning and a 240 ml cold brew later the same day?

If you drink a 250 ml Red Bull (80 mg) at 9:00 and a 240 ml cold brew (200 mg) four hours later at 13:00, immediately after the cold brew you will have about 249 mg of caffeine present: ~49.2 mg left from the earlier Red Bull plus 200 mg fresh from the cold brew. Cumulative residual is the sum of remaining milligrams from each prior dose at a chosen time point.

Calculation details: Red Bull remaining at 13:00 = 80 × 0.5^(4/5.7) ≈ 49.2 mg; add cold brew 200 mg → 249.2 mg. If you evaluate that combination six hours after the cold brew (19:00), the cold brew will be ≈200 × 0.5^(6/5.7) ≈ 96.4 mg and the Red Bull will be ≈80 × 0.5^(10/5.7) ≈ 23.8 mg, so ≈120.2 mg remains. Note that clinical sleep research (Drake et al., 2013) found that caffeine intake can reduce objective sleep time when taken 6 hours before bedtime, so timing matters when stacking high-dose drinks like cold brew; see Drake et al., J Clin Sleep Med (2013).

Can mixing Red Bull with alcohol increase risks and why?

Mixing Red Bull (or other energy drinks) with alcohol raises risk because the stimulant effects of caffeine can mask sedative effects of alcohol, making people feel more alert without lowering their blood alcohol concentration. Co-ingestion is consuming an alcoholic beverage and a caffeinated energy drink within the same period, and it alters perceived impairment without removing alcohol's physiologic effects.

The European Food Safety Authority's 2015 opinion highlights that single caffeine doses of about 200 mg can produce pronounced acute effects in some people, so combining substantial caffeine with alcohol increases the chance that someone will still be impaired while feeling less so (EFSA 2015). Practically, avoid combining multiple high-caffeine sources (for example a 240 ml cold brew plus one or more energy drinks) before driving or operating machinery because the stimulant is not protective against alcohol-related impairment.

What should I do if someone has palpitations, severe anxiety or vomiting after drinking Red Bull?

If someone has mild palpitations or anxiety after a Red Bull, have them sit, breathe slowly, hydrate with water and stop consuming more caffeine; if symptoms are severe (chest pain, fainting, very fast irregular heartbeat) call emergency services immediately. Palpitations are subjective sensations of a heart beating irregularly, too fast, too hard or skipping beats, and they can be triggered by caffeine in susceptible individuals.

Reference thresholds: the U.S. Food and Drug Administration notes 400 mg/day as a conservative upper bound for most healthy adults, and EFSA's opinion lists 200 mg/day for pregnant people—exceeding such limits increases risk of acute adverse effects (FDA, EFSA 2015). If you suspect overdose or someone swallowed a very large amount, consult emergency guidelines such as our caffeine overdose risks guide.

How can I use tools and logs to keep Red Bull intake within safe limits?

Use a milligram-based log and the half-life model to record each serving's mg and timestamp so you can see current cumulative caffeine and projected residuals; a caffeine log is a running record of milligram amounts consumed and timestamps. Practical tools on this site let you do that automatically: try the caffeine half-life calculator to see mg left right now, the last-cup-before-bed planner to estimate bedtime impact, and the safe daily limit by body weight tool for personalized guidance.

Example workflow: log a Red Bull at 08:00 and a single espresso (63 mg) at 15:00; the calculator will compute residuals using the 5.7 h half-life so you see the momentary total and expected level at bedtime. If you prefer side-by-side choices before buying, use our caffeine comparison or the energy drink comparison to pick lower-caffeine options. If you keep a rolling total, apps (or a simple log like CoffeeLog) will flag when you approach the FDA 400 mg/day threshold and EFSA pregnancy guidance of 200 mg/day.

Bottom line

A single 250 ml Red Bull contains 80 mg of caffeine and a 355 ml can contains 114 mg; those are the dataset values you should count when totaling intake. The population-average caffeine half-life used on this site is 5.7 hours (342 minutes), so elimination follows first-order kinetics: remaining mg = dose × 0.5^(hours/5.7). For example, one 250 ml Red Bull (80 mg) leaves ≈38 mg after 6 hours because 80 × 0.5^(6/5.7) ≈ 38 mg.

Regulatory context matters: the U.S. Food and Drug Administration recommends an upper limit of about 400 mg/day for most healthy adults, and the European Food Safety Authority sets pregnancy guidance around 200 mg/day—count all sources (coffee, tea, energy drinks, pills) toward those limits (FDA, EFSA 2015). Use the site tools—caffeine half-life calculator, last-cup-before-bed planner and safe daily limit estimator—to track mg precisely, prevent accidental stacking (for example multiple Red Bulls or a Red Bull plus a strong cold brew) and avoid exceeding these safety benchmarks.