How much caffeine is really in your pre-workout?

The short answer

74 of 105 pre-workouts on the site give a caffeine amount we can count. The middle one has 200 mg a serving; 27 have 300 mg or more.
13 list caffeine only inside a proprietary blend, with no amount of its own, so the label doesn't say how much there is.
10 list at least one caffeine source, such as a plant extract or dicaffeine malate, without saying how much caffeine it gives, so the real total is higher than any number we can count.
Studies of caffeine and exercise used 3–6 mg per kg of bodyweight: 225–450 mg for someone who weighs 75 kg. 33 of the 74 labels reach 225 mg in one serving.
The FDA cites 400 mg a day for most healthy adults as an amount not generally associated with negative effects, and that's for the whole day, coffee included. 2 labels have 400 mg or more in a single serving.

Caffeine in one serving, one dot per label: the 74 pre-workouts on the site with an amount we can count. Green dots reach the 225 mg that studies start at for a 75 kg person (33 labels); orange dots are below it. The dashed line is 400 mg.

The caffeine line isn't always the caffeine

A facts panel lists ingredients by the weight of what went into the tub. For plain caffeine that's the same thing as the caffeine. For other forms it isn't, and the difference can be a quarter of the number or more.

Share of the printed weight that is caffeine

Caffeine anhydrousthe weight is the caffeine100%
xumXR delayed-releaseRYSE Loaded Pre labelmin. 75%
VitashureEVLution ENGN label60%
Caffeine citratedosing convention50%
Guayusa leaf extract70 of 350 mg, Thorne label20%
Dicaffeine malateoften not printednot stated

How much of each form's printed weight is caffeine, as the labels state it. Dicaffeine malate's share is often missing from the label.

Caffeine anhydrous is dried caffeine. The weight on the panel is the caffeine. It's the most common form on the labels here.
Caffeine citrate is caffeine bound to citric acid. By the convention used for dosing it, half its weight is caffeine, and that's how we count it unless the label states the caffeine.
Dicaffeine malate (often sold as Infinergy) is caffeine bound to malic acid. Some labels print the share that is caffeine, for example "75% caffeine". Many don't. When neither the line nor the rest of the label says how much caffeine it gives, we don't guess: the product page counts the caffeine we can confirm and says the real total is higher.
Delayed-release forms such as zumXR, xumXR or Vitashure are caffeine in a coating or carrier. The weight on the panel includes it. Labels usually print the share, like "min. 75% caffeine" or "provides 60% active caffeine", and we count that share.
Caffeine from plants, such as green tea, coffee bean or fruit, guarana, guayusa or yerba mate, comes as an extract. The extract's weight isn't caffeine. Thorne's Pre-Workout Elite lists 350 mg of guayusa leaf extract and says it "provides approximately 70 mg of caffeine". If a label gives no such figure, the caffeine from that extract is unknown.

Look for a total printed elsewhere

Many labels print the full caffeine amount outside the facts panel: under it, in the directions or on the front. When the panel and the total disagree, the total is the manufacturer's own statement of what's in a serving, and it's the number we use. These are the labels where we found it, and what the product pages count now:

What the caffeine lines add up to Caffeine the label states

RYSE Loaded Pre420 mg on the panel390 mg stated
EVLution Nutrition ENGN350 mg on the panel300 mg stated
ProSupps Mr. Hyde206 mg on the panel196 mg stated
Redcon1 Total War350 mg on the panel320 mg stated
ProSupps Mr. Hyde Xtreme420 mg on the panel378 mg stated
VMI Sports K-XR586 mg on the panel400 mg stated

Grey: the weight of the caffeine lines on the facts panel, added up. Lime: the caffeine the same label states for one serving.

Product	What the facts panel lists	What the label says in total	Counted
RYSE Loaded Pre	300 mg caffeine anhydrous and 120 mg of xumXR delayed-release caffeine (min. 75% caffeine)	The front of the tub: “390 mg caffeine”	390 mg
EVLution Nutrition ENGN	225 mg caffeine anhydrous and 125 mg of Vitashure, which “provides 60% active caffeine”	“Product contains 300mg of total caffeine per serving”	300 mg
ProSupps Mr. Hyde	169 mg caffeine anhydrous and 37 mg of dicaffeine malate	“This product contains 196 mg of caffeine”	196 mg
Redcon1 Total War	250 mg caffeine anhydrous and 100 mg of dicaffeine malate	“This product contains 320mg of caffeine per serving”	320 mg
ProSupps Mr. Hyde Xtreme	A 420 mg “Caffeine Matrix” of three forms	“Actual caffeine content is 378 mg per serving”	378 mg
VMI Sports K-XR	A 586 mg caffeine blend of three forms, none of them given an amount	“Yielding 400 mg net caffeine”	400 mg

Adding up the panel would have given a different number for every one of them. We corrected these pages on 14 October 2026; each change is in the corrections log.

When caffeine is inside a blend

A proprietary blend prints one weight for several ingredients together. If caffeine is one of them and has no amount of its own, the label doesn't tell you how much caffeine you're taking. We can't count it either, so the product page marks caffeine Hidden in a blend and the caffeine calculator can't add it to your day. The labels on the site where all of the caffeine is in a blend:

Check the serving, not the scoop

The amounts on a label are per serving, and a serving isn't always one scoop. PEScience Prolific's serving is two scoops, so one scoop holds 160 mg of caffeine, half the 320 mg on the label. Directions can also allow more than one serving a day.

Reading your own tub

Find caffeine on the facts panel and note the form next to it.
If it isn't caffeine anhydrous, look for a percentage on that line, or a sentence such as "contains 300 mg of caffeine" below the panel or on the front.
Check how many scoops make a serving, and how many servings the directions allow.
Add the rest of your day: coffee, energy drinks, tea, other supplements. The caffeine calculator does this in your browser and doesn't send anything anywhere.
Compare a serving with 3–6 mg per kg for your own weight. The dose calculator works it out.

Or skip the arithmetic: search for your product on the pre-workouts page, or paste its label, and we'll do the counting, with every step shown.

Sources

Guest NS, VanDusseldorp TA, Nelson MT, et al. International society of sports nutrition position stand: caffeine and exercise performance. J Int Soc Sports Nutr. 2021;18(1):1. doi:10.1186/s12970-020-00383-4
U.S. Food and Drug Administration. Spilling the Beans: How Much Caffeine is Too Much? Consumer Update (content current as of 28 August 2024). fda.gov
Label wording: each product's label in the NIH Dietary Supplement Label Database, read 14 October 2026. The label source and date are on each product page.
How we count every form: our methodology and the caffeine guide.