Red Bull, Monster Energy and Celsius are three of the most popular ways to get caffeine from a can. This page puts each of them next to a SZN caffeine pouch on the things that actually change when you switch: the dose, the sugar, the B-vitamins, acidity, timing and cost. Every brand figure comes from its own label. Where a drink does something well, we say so.
Red Bull8.4 fl oz can
Monster16 fl oz can
Celsius12 fl oz canThe caffeine in a SZN pouch is the same molecule as in any energy drink. Red Bull and Monster both contain about 10 mg of caffeine per fl oz, so the dose follows the size of the can; Celsius contains about 17 mg per fl oz.6,7,8 All three state the caffeine per can on their US labels, and so does SZN, per pouch.
80 mg per 8.4 fl oz (250 ml) can, as stated on the label. EFSA uses the same 80 mg as its reference figure for a 250 ml energy drink.1,6
160 mg per 16 fl oz can on the label. That is more than one SZN pouch and close to EFSA's 200 mg single-dose level.2,7
200 mg per 12 fl oz can on the US label. One can equals EFSA's 200 mg single-dose level for healthy adults.2,8
The same 100 mg in every pouch, every flavour. The label is checked by Eurofins, an independent laboratory (certificate of analysis 24-08-117).9
How much is too much? EFSA considers up to 400 mg of caffeine a day, and single doses up to 200 mg, safe for healthy adults, and the US FDA cites the same 400 mg a day.2,5 That is four SZN pouches, and the limit covers caffeine from every source: one Monster (160 mg) plus two pouches (200 mg) already makes 360 mg, and one Celsius (200 mg) plus two pouches reaches the full 400 mg. Max 4 pouches a day. Not for children, pregnant or breastfeeding women, or people sensitive to caffeine.
Measured values first, then the practical differences you notice day to day. Drink figures are from the US labels; Red Bull and Monster figures are for the original, sugared versions; Celsius is sugar-free as standard. A tick marks a clear difference on that row; most rows are simply different, not better or worse.
| SZN1 pouch | Red Bull8.4 fl oz | Monster16 fl oz | Celsius12 fl oz | |
|---|---|---|---|---|
| Measured values | ||||
| Caffeine per serving6–8 | 100 mg | 80 mg | 160 mg | 200 mg |
| Caffeine per fl oz6–8 | Not a drink | ~9.5 mg | 10 mg | ~16.7 mg |
| Caffeine on the labelTie | Yes, per pouch | Yes, per can | Yes, per can | Yes, per can |
| Sugar per serving6–8 | 0 g | 27 g | 54 g | 0 g |
| Calories per serving6–8 | 0 kcal | 110 kcal | 230 kcal | 10 kcal |
| Sweetened with6–8 | No sugar | Sugars (sucrose, glucose) | Sugars, plus sucralose | Sucralose |
| B-vitamins6–8All four | B1, B5, B6, B12 | B3, B5, B6, B12 | B2, B3, B6, B12 | B2, B3, B5, B6, biotin, B12, plus vitamin C |
| Other actives6–8 | None besides caffeine and vitamins | Taurine | Taurine, ginseng and guarana extracts, L-carnitine | Guarana, green tea and ginger extracts, taurine, glucuronolactone |
| Acidity11 | pH neutral | Acidic | Acidic | Acidic |
| Dose verified by a lab9 | Yes · Eurofins | Declared on the label | Declared on the label | Declared on the label |
| Day to day Practical | ||||
| How you take it | Under the upper lip, nothing to drink | Drink 8.4 fl oz | Drink 16 fl oz | Drink 12 fl oz |
| Fast acting | Within 5 minutes | 20–30 minutes | 20–30 minutes | 20–30 minutes |
| Release | Releases caffeine for up to 90 minutes | Absorbed from the gut once you drink it | Absorbed from the gut once you drink it | Absorbed from the gut once you drink it |
| Servings you carry | 15 per pocket-sized can | 1 per can, best served cold | 1 per can, best served cold | 1 per can, best served cold |
| Discretion | Out of sight, hands free | A can in hand | A can in hand | A can in hand |
| 15 servings, bought singly12,13 | $12 · one can | ~$38–53 · 15 cans | ~$41–53 · 15 cans | ~$35–45 · 15 cans |
| Cost per 100 mg caffeine12,13 | $0.41–0.80 | ~$3.10–4.40 | ~$1.70–2.20 | ~$1.15–1.50 |
| Taste | Four flavours: Original, Mint, Citrus, Peach | A cold, fizzy drink, many editions | A cold, fizzy drink, many flavours | A cold, fizzy drink, many flavours |
A US can of Red Bull Energy Drink (8.4 fl oz) contains 27 g of sugar and 110 kcal.6 A 16 fl oz can of Monster Energy has 54 g of sugar and 230 kcal, all of the sugar added.7 A 12 fl oz Celsius contains no sugar and 10 kcal.8 To be fair, Red Bull and Monster also sell sugar-free versions.
A SZN pouch contains no sugar and has 0 kcal. It is not a drink, so there is nothing to finish and nothing to count beyond the caffeine.
Caffeine you drink is absorbed from the gut, and blood levels typically peak within about an hour.2 That is the same for a Red Bull, a Monster or a Celsius; how fast you drink the can is up to you, and most people notice a can after 20–30 minutes. A SZN pouch sits under your upper lip, where you typically notice it within 5 minutes, and it releases its caffeine for up to 90 minutes. You decide how long it stays in, and you can take it out sooner.
Once caffeine is in your system, your body handles it the same way whatever the source. Its half-life in healthy adults is several hours and differs a lot from person to person. EFSA notes that 100 mg close to bedtime can affect sleep in some adults, so time an afternoon pouch the way you would time an afternoon can.2
8.4–16 fl oz of cold, carbonated liquid, sipped or drunk quickly. The caffeine is absorbed after you swallow.
No drink needed. The pouch releases caffeine for up to 90 minutes, and you choose when to remove it.
Caffeine is caffeine. Total daily intake is what counts, so add up cans and pouches together.
Credit where due: all three drinks already contain B-vitamins. Red Bull lists niacin (B3), pantothenic acid (B5), B6 and B12; Monster lists riboflavin (B2), niacin, B6 and B12; Celsius lists riboflavin, niacin, pantothenic acid, B6, biotin and B12, plus vitamin C.6,7,8 SZN contains B1, B5, B6 and B12.
Teeth. Red Bull, Monster and Celsius are all carbonated, and all three list citric acid on their labels.6,7,8 Laboratory measurements put energy drinks as a category at around pH 3, and the same study found they dissolved tooth enamel in testing.11 The American Dental Association names soft drinks the major culprit in tooth erosion, notes that even sugar-free drinks are more likely to be acidic thanks to carbonation, and points out that erosion is permanent.10 Red Bull and Monster add sugar on top: 27 g and 54 g a can. Celsius removes the sugar, but not the acidity.
Gut. A drink goes through your stomach. The US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists caffeine and acidic foods among the things that can trigger or worsen reflux (GER and GERD) symptoms in some people, and notes that fizzy drinks make you swallow more air, which may lead to more gas and discomfort.14,15 Caffeine is on that list whatever the source, SZN included, so if caffeine bothers your stomach, that applies to every option on this page.
SZN. The pouch is white, tannin-free and pH-neutral. It doesn't stain your teeth and isn't acidic on enamel, and it contains no sugar. The pouch is never swallowed, so it doesn't pass through your stomach the way a drink does; only a little caffeine is swallowed with saliva. And it isn't carbonated, so there is no fizz.
Acidic, carbonated and sugar-sweetened: 27 g sugar a can, swallowed.
Acidic, carbonated and sugar-sweetened: 54 g sugar a can, swallowed.
No sugar, but still acidic and carbonated, with citric acid, swallowed.
pH-neutral, white and tannin-free. 0 g sugar, no fizz, and the pouch itself is never swallowed.
One SZN can is $12 and gives you 15 servings. Getting 15 servings from Red Bull means buying 15 cans: about $38–53 at typical US single-can prices. Monster comes to about $41–53, Celsius about $35–45. Buy SZN in the 24-can Mix & Match bundle and the same 15 servings cost from about $6.15.12,13
The honest read: it isn't close. Fifteen single cans of any of the three cost three to four and a half times one SZN can. Count it per 100 mg of caffeine instead, so the bigger cans get full credit for their bigger dose, and SZN still costs less than all three bought singly. Buy the drinks by the case and they get cheaper; a case of Celsius can even dip under SZN's single-can price per 100 mg. SZN's $0.41 bundle price is lower still.
Red Bull, Monster and Celsius are cold, fizzy drinks, all three already include B-vitamins, and Celsius has no sugar. SZN gives you a fixed 100 mg dose with no sugar, nothing acidic to sip and nothing to carry but a pocket-sized can of 15, for $12 instead of fifteen cans. If what you want from the can is the caffeine, a pouch is the simpler way to get it.
