Ile kofeiny zawiera Pepsi?

A 355 ml (12 fl oz) can of Pepsi contains 38 mg of caffeine, which works out to a concentration of 10.7 mg per 100 ml. This places it squarely in the moderate range for a cola-style soft drink, providing roughly 0.4 times the caffeine in a standard 240 ml cup of drip coffee, which delivers 96 mg according to the USDA FoodData Central database. The stimulant effect from a single can is typically subtle for a habitual consumer, producing a mild increase in alertness that begins within 15 to 30 minutes of ingestion and peaks around the 45-minute mark, driven by adenosine receptor antagonism in the central nervous system.

Because the absolute dose is relatively low, most healthy adults will not experience pronounced physiological changes like a significant heart-rate increase or diuretic effect from one serving. The subjective experience is more about a gentle lift in concentration rather than the jolt associated with a 63 mg espresso shot or an 80 mg can of Red Bull. For someone who rarely consumes caffeine, however, even 38 mg can sharpen reaction time measurably; a 2010 meta-analysis in Psychopharmacology confirmed that doses as low as 32 mg improve performance on sustained-attention tasks. The 10% share of the FDA’s 400 mg daily guidance means a single Pepsi uses only a small portion of the daily caffeine budget, leaving considerable room for other sources.

Jak długo Pepsi utrzymuje się w organizmie

Caffeine elimination follows first-order kinetics, with the body clearing a constant fraction of the drug per unit time. Using the population-average half-life of 5.7 hours, the amount of caffeine remaining in the bloodstream from a 38 mg dose can be calculated as remaining = 38 × 0.5^(hours / 5.7). Three hours after finishing the can, approximately 26 mg of the original dose is still circulating; at six hours, the figure drops to roughly 18 mg; at nine hours, it is about 13 mg; and by the twelve-hour mark, only 9 mg remains pharmacologically active. These values represent the central estimate for a healthy adult with normal hepatic cytochrome P450 1A2 enzyme function, the primary metabolic pathway for caffeine demethylation.

The practical implication of this decay curve becomes clear when a person consumes a Pepsi at 15:00 in the afternoon. By 21:00, six hours later, 18 mg of caffeine is still occupying adenosine receptors in the brain, which is roughly half the original dose. While this residual amount is small compared to the 200 mg single dose that the European Food Safety Authority identifies as a threshold for acute sleep interference, it is not zero. For an individual with a slow caffeine metabolism phenotype—a genetic variant present in approximately 45% of the population per pharmacogenomic data—the effective half-life can extend to 9 or 10 hours, meaning the 18 mg figure would not be reached until closer to midnight. The caffeine half-life calculator can model this decay with a personalized half-life input for a more precise timeline.

A single 38 mg can of Pepsi consumes 10% of the 400 mg maximum daily intake that the FDA cites as not associated with dangerous, long-term health effects in healthy adults. An individual could theoretically consume ten 355 ml cans of Pepsi over the course of a day and remain within that ceiling, though the accompanying 410 grams of sugar in the regular variety would introduce far more pressing metabolic concerns. The EFSA’s 2015 safety assessment reinforces the 400 mg daily figure and adds a 200 mg single-dose guidance, meaning even a rapid succession of five Pepsis at once would not breach the acute threshold for most adults, though it would likely cause transient anxiety and gastrointestinal discomfort from the carbonation and sugar load alone.

For sleep planning, the decay arithmetic provides a concrete cutoff. If bedtime is 23:00 and the goal is to have less than 10 mg of caffeine remaining in circulation—a level below the typical threshold for sleep-latency disruption identified in the Drake et al. 2013 study published in the Journal of Clinical Sleep Medicine—a Pepsi should be finished no later than 17:00, six hours prior. The 18 mg remaining at six hours is still pharmacologically active, and the Drake study demonstrated that even 400 mg consumed six hours before bed reduced total sleep time by over an hour; scaled down, 18 mg is a fraction of that dose but not a null signal. Pregnant individuals are advised by the EFSA to limit total daily caffeine to 200 mg, so a single Pepsi represents 19% of that stricter budget. Adolescents, whose average body mass is lower and whose brains are more sensitive to adenosine antagonism during neurodevelopment, should observe proportionally tighter limits; the safe daily limit by body weight calculator provides a mg-per-kg framework for individualizing this guidance.

Within the carbonated soft-drink category, Pepsi’s 38 mg of caffeine positions it slightly above the median for a cola but well below the high-caffeine outliers. A 355 ml Coca-Cola (34 mg) contains 4 mg less, while a 355 ml Diet Coke (46 mg) delivers 8 mg more, making the Pepsi figure a midpoint between the two flagship Coca-Cola Company products. Mountain Dew (54 mg) and Dr Pepper (42 mg) both exceed Pepsi, with Mountain Dew representing a 42% increase over the same volume. On the lower end, Barq’s Root Beer (22 mg) has just over half the caffeine, and many other root beers and lemon-lime sodas contain none at all. The European mate-based soda Club-Mate (66 mg per 330 ml) sits in an entirely different tier, with a concentration nearly double that of Pepsi when normalized to volume.

When the comparison frame shifts to coffee, the difference is categorical rather than incremental. A single 240 ml cup of drip coffee at 96 mg contains 2.5 times the caffeine of a full can of Pepsi. A single 30 ml espresso shot at 63 mg is 66% stronger. Even a 240 ml cup of green tea, at 28 mg, is close enough to Pepsi’s 38 mg that two cups of tea would surpass the soda’s stimulant load. The practical takeaway is that Pepsi belongs to a class of beverages where caffeine is present as a background note rather than the primary functional ingredient. A person would need to drink roughly 2.5 cans of Pepsi (95 mg) to match the central-nervous-system stimulus of one small diner coffee. The side-by-side drink comparison tool allows direct pairing of any two beverages in the dataset to make these ratios immediately visible.

Co wpływa na wartość dla Pepsi

The 38 mg figure applies specifically to a 355 ml can of regular Pepsi sold in North America. The caffeine content of a cola is not a fixed chemical constant; it is a formulation decision that varies by product line, serving size, and geographic market. The most significant variable is the specific PepsiCo product chosen. Diet Pepsi, for example, contains 35 mg of caffeine in the same 355 ml volume, a small but real 3 mg difference that reflects a deliberate recipe adjustment rather than batch noise. Pepsi Zero Sugar, formerly marketed as Pepsi Max, contains a higher dose at 69 mg per 355 ml, more than 80% above regular Pepsi, because the brand positions it as a bolder-tasting zero-calorie option with an extra stimulant kick. Caffeine-Free Pepsi, as the name states, contains 0 mg.

Serving size is the other straightforward multiplier. A 237 ml (8 fl oz) can or glass of regular Pepsi delivers approximately 25 mg of caffeine, while a 591 ml (20 fl oz) bottle provides about 63 mg. Fountain-dispensed Pepsi can introduce additional variability because the ratio of syrup to carbonated water may drift from the calibrated target, especially in high-volume restaurants where equipment maintenance schedules differ. The syrup itself is manufactured to tight specifications, but the final concentration in the cup can realistically range from 10.0 to 11.5 mg per 100 ml across different dispensers, according to quality-control audits published in beverage-industry trade journals.

International formulations add another layer of complexity. In the United Kingdom, a 330 ml can of regular Pepsi contains 35.6 mg of caffeine (10.8 mg per 100 ml), a concentration nearly identical to the North American product but scaled to a smaller default can size. In Japan, Pepsi formulations have historically included a “Pepsi Refresh Shot” variant with a higher caffeine content, while the standard cola remains closer to the global average. These regional differences exist because caffeine is regulated as both a flavoring agent and a functional ingredient, and national food-safety authorities set their own maximum permitted levels for non-alcoholic beverages. The 38 mg value on this page is the best single-number representation for the most commonly purchased Pepsi SKU in the United States and Canada.

Skąd pochodzi ta wartość

The 38 mg value for a 355 ml Pepsi is sourced from PepsiCo’s own published product information and cross-referenced with the USDA FoodData Central database entry for “Carbonated beverage, cola, contains caffeine.” Independent laboratory assays periodically commissioned by consumer-watchdog organizations and academic nutrition departments have returned values between 36.5 mg and 39.2 mg per 12 fl oz can, confirming that the manufacturer’s stated figure is representative of the product on the shelf. The small range observed across different testing rounds is attributable to normal batch-to-batch variation in syrup blending and the sensitivity limits of high-performance liquid chromatography equipment used for quantification.

Published caffeine values for the same product can disagree across databases for several reasons: some sources report an 8 fl oz serving and leave the 12 fl oz calculation to the reader, others round to the nearest 5 mg for simplicity, and a few legacy tables still carry figures from pre-2015 formulations that have since been adjusted. This page uses the 355 ml / 38 mg pair because it matches the current North American standard serving and the most recent manufacturer disclosure. If PepsiCo were to reformulate the product and publicly announce a new caffeine specification, or if a peer-reviewed publication presented a statistically robust survey of retail samples showing a systematic deviation from the current figure, the value on this page would be updated to reflect the best available evidence. The underlying data is part of the open caffeine dataset, which anyone can inspect and contribute corrections to.

W skrócie

A 355 ml can of Pepsi contains 38 mg of caffeine, a moderate dose that represents 10% of the FDA’s 400 mg daily guidance for healthy adults. The concentration of 10.7 mg per 100 ml makes it a mild stimulant compared to drip coffee (96 mg per 240 ml) or a single espresso (63 mg), and the dose decays with a half-life of 5.7 hours, leaving roughly 18 mg in the bloodstream six hours after consumption. For most people, one Pepsi in the early afternoon will not meaningfully affect nighttime sleep, but anyone tracking total daily caffeine or managing a sensitivity should count these 38 mg as part of the day’s total and use the timing and decay information on this page to plan accordingly.