The Fitties Journal
What Is in Pre-Workout? 7 Ingredients That Matter and 4 to Skip
Key Takeaways
Here's what matters most if you're short on time:
- Nearly every pre-workout is built from the same short list: caffeine, beta-alanine, citrulline, and creatine.
- In an analysis of 100 top-selling pre-workouts, the average serving carried 254 mg of caffeine.
- Beta-alanine research protocols use 4 to 6 g daily for 2 to 4 weeks; the average product serving contains 2.0 g.
- A proprietary blend only has to declare its total weight, so individual ingredient doses can legally stay hidden.
- The FDA has cited 400 mg of caffeine a day from all sources as an amount not generally associated with negative effects in most healthy adults.
- Creatine and exogenous ATP work through daily consistency, not through how a single serving feels.
Nearly every pre-workout on the shelf is built from the same short list of ingredients: caffeine, beta-alanine, citrulline, creatine, taurine, and tyrosine, plus electrolytes, B vitamins, sweeteners, and flavoring. An analysis of the 100 top-selling pre-workout supplements found caffeine in 86% of them at an average of 254 mg per serving, beta-alanine in 87%, citrulline in 71%, and creatine in 49% (Jagim et al., Nutrients, 2019).
So the ingredients are not the differentiator. The doses are. That same analysis found the average beta-alanine serving landed below the amount used in the research it borrows credibility from, and that 58 of the 100 products hid at least part of their formula inside a proprietary blend. Here is what each ingredient does, the dose research actually uses, and the four things on a label that tell you to put the tub back.
Rate your current pre-workout with the label scorecard
What Is in a Pre-Workout Supplement?
A pre-workout is a powdered drink mix built around a stimulant, one or two fatigue-buffering compounds, and a supporting cast of amino acids, minerals, and vitamins. Strip away the flavoring and the artwork and almost every formula in the category maps to the table below.
The right-hand column is the one that matters. Compare it to your own label. If the amount you are getting sits meaningfully below the research dose, you are paying for the ingredient's reputation rather than the thing that earned it.
| Ingredient | What it is | Found in | Dose used in research |
|---|---|---|---|
| Caffeine | Central nervous system stimulant | 86% of products | 3 to 6 mg per kg body mass |
| Beta-alanine | Amino acid that raises muscle carnosine | 87% of products | 4 to 6 g daily for 2 to 4 weeks |
| Citrulline | Amino acid, nitric oxide precursor | 71% of products | 6 to 8 g citrulline malate |
| Creatine | Phosphocreatine substrate | 49% of products | 3 to 5 g daily maintenance |
| Tyrosine | Amino acid, catecholamine precursor | 63% of products | Not well established |
| Taurine | Amino acid involved in cell volume and calcium handling | 51% of products | Not well established |
| Electrolytes | Sodium, potassium, magnesium | Inconsistent | Scaled to sweat loss |
| Exogenous ATP | Adenosine triphosphate disodium | Rare | 400 mg daily |
Prevalence figures come from the Jagim 2019 analysis of 100 top-selling products. Research doses are drawn from the position stands and reviews cited in each section below.
FitBoost+
Three grams of creatine monohydrate and 400 mg of Peak ATP, each with its own number on the panel. Ninety-five milligrams of declared caffeine from a pterostilbene co-crystal, plus sodium, potassium, and magnesium. Stevia-sweetened. No artificial colors, no artificial sweeteners, nothing to squint at.
Shop FitBoost+What Does Pre-Workout Do?
A pre-workout does not do one thing. It does several unrelated things at once, on three different clocks, which is exactly why the category is so easy to sell and so hard to evaluate.
The stimulant portion acts fast. That is the part you feel, and feeling it is not the same as performing better. The International Society of Sports Nutrition position stand on caffeine notes that the most commonly used timing is 60 minutes before exercise.
The buffering portion is slower and quieter. Beta-alanine works by raising muscle carnosine over weeks of daily intake, not by doing anything in the 30 minutes after you drink it. The same is true of creatine, which works through muscle saturation. Neither ingredient cares much what time you take it. Both care whether you took it yesterday.
The hydration portion depends entirely on the formula. Some pre-workouts carry meaningful sodium, potassium, and magnesium. Most carry a token amount or none at all, which matters if you sweat heavily. Our guide to electrolytes and hydration for athletes covers how much you actually lose.
Working out which clock an ingredient runs on is the whole game. It tells you what to expect on day one, what to expect on week four, and which ingredients you can skip a day of without consequence. For the hour-by-hour version, see how long pre-workout lasts.
Rate Your Current Pre-Workout
You have the ingredient list and the doses that go with it, which is enough to judge a label. Go get whatever is in your cabinet and answer seven questions about its Supplement Facts panel. It takes about two minutes, and the rest of this guide explains why each answer matters.
The 7 Pre-Workout Ingredients That Matter
These are the ingredients with a real evidence base behind them. Note that "has a real evidence base" and "is well dosed in your tub" are two different questions, and the second one is on you to check.
1. Caffeine
Caffeine has the deepest research base of anything in the category, and it is the reason most people feel something at all. The ISSN position stand concludes that caffeine improves exercise performance at doses of 3 to 6 mg per kilogram of body mass, and that very high doses around 9 mg/kg bring a high incidence of side effects without adding benefit (Guest et al., JISSN, 2021).
For an 80 kg lifter that works out to roughly 240 to 480 mg. So the 254 mg average found across top-selling products is not absurd on its own. The problem is that the average tub does not know your body mass, your caffeine tolerance, your training time, or how much coffee you already had. The FDA has cited 400 mg per day from all sources as an amount not generally associated with negative effects for most healthy adults, while noting wide variation in how sensitive people are and how fast they clear it (FDA, "Spilling the Beans"). A 350 mg scoop plus two coffees clears that before lunch.
Delivery form is the newer variable. Caffeine pterostilbene co-crystal pairs caffeine with pterostilbene in a single crystal structure, and preliminary pharmacokinetic work points to slower absorption than ordinary caffeine anhydrous. The published human data on it is thin, so read it as promising rather than settled. If you would rather get your caffeine from a mug, we compared the two in coffee before a workout.
2. Creatine monohydrate
Creatine is the most studied ingredient in sports nutrition and the one most often underdosed in pre-workouts. The ISSN calls creatine monohydrate "the most effective ergogenic nutritional supplement currently available to athletes with the intent of increasing high-intensity exercise capacity and lean body mass during training," and puts maintenance dosing at 3 to 5 g per day (Kreider et al., JISSN, 2017).
The average pre-workout that includes creatine provides 2.1 g. That is not nothing, but it sits below the maintenance range, and it only counts if you take the product every day. Creatine works on saturation. Taking it three times a week because that is when you train leaves the tank permanently half full. Our creatine supplements guide covers loading, timing, and form in depth.
3. Beta-alanine
Beta-alanine raises muscle carnosine, which buffers hydrogen ions during hard efforts. The ISSN position stand puts the protocol at 4 to 6 g daily for at least 2 to 4 weeks, with the clearest effects in all-out efforts lasting 1 to 4 minutes (Trexler et al., JISSN, 2015).
The average pre-workout serving contains 2.0 g. The Jagim analysis states plainly that the average beta-alanine dose per serving was below the recommended efficacious amount. Meanwhile the NIH Office of Dietary Supplements notes there is "little consistent evidence of a relationship between the dose of beta-alanine and performance effect" (NIH ODS). So the honest read is that beta-alanine has a plausible mechanism, a defined protocol, and an inconsistent record.
The tingling is not the benefit. Paresthesia shows up above roughly 800 mg in non-sustained-release form, generally fades within 60 to 90 minutes, and has no evidence of being harmful. It is a sensation, not a signal. We made the full case in pre-workout without beta-alanine.
4. L-citrulline and citrulline malate
Citrulline is the pump ingredient. A 2021 meta-analysis found that 6 to 8 g of citrulline malate taken 40 to 60 minutes before strength training increased repetitions to failure by about 6.4% compared with placebo, an effect the authors themselves describe as small (Vårvik et al., IJSNEM, 2021). NIH ODS is blunter, calling the supporting research "limited and conflicting at best."
The average pre-workout provides 4.0 g of citrulline, and many labels list citrulline malate without disclosing the ratio, so part of that weight is malic acid rather than citrulline. Below the research dose, the pump is mostly a story you tell yourself between sets.
5. Exogenous ATP
Oral adenosine triphosphate is the rare pre-workout ingredient that is not in most pre-workouts. In a 12-week trial in resistance-trained men, 400 mg per day of ATP disodium produced greater gains in total body strength (an increase of 55.3 kg versus 22.4 kg for placebo), vertical jump power, and muscle thickness (Wilson et al., Nutrition & Metabolism, 2013). In a later randomized trial in 42 men, ATP levels dropped after exercise in the placebo group but held steady in the group taking 400 mg for two weeks, and muscle excitability declined across later sprint bouts only in the placebo group (Purpura et al., J Am Coll Nutr, 2017).
Two caveats worth stating out loud. Both trials are small, and the 2013 study was funded in part by the ingredient's manufacturer, which also supplied the product. That does not invalidate the findings, but it is a thinner evidence base than creatine or caffeine and should be read that way. We covered the underlying biochemistry in how ATP powers every rep.
6. Electrolytes
Sodium, potassium, and magnesium are lost in sweat and are involved in muscle contraction, nerve signaling, and fluid balance. Whether you need them in a pre-workout depends on how much you sweat and what your diet already supplies. A 45-minute session in an air-conditioned gym is a different problem from two hours of conditioning in July.
Most pre-workouts either skip electrolytes or add a rounding error of sodium so the label can list them. If hydration is the reason you are buying, read the milligram amounts rather than the ingredient names.
7. Bioactive B vitamins
B vitamins are coenzymes in the pathways that convert food into usable energy. They are not stimulants and they will not make a session feel different. What varies between products is form. Pyridoxal 5'-phosphate, methylcobalamin, and methylfolate are already in their active states, while cheaper forms such as pyridoxine hydrochloride, cyanocobalamin, and folic acid have to be converted first. If a label lists B vitamins, the form in parentheses tells you more than the milligram figure does.
4 Pre-Workout Ingredients to Skip
Some things on a pre-workout label are not underdosed. They simply should not be there.
1. Proprietary blends. Under 21 CFR 101.36, a manufacturer only has to declare the total weight of a proprietary blend, not the amount of each ingredient inside it. That is legal, and it is also why 58 of 100 top-selling pre-workouts used at least one, with those blends averaging 14 ingredients at undisclosed quantities. If the actives you are buying the product for sit inside the blend, you cannot verify the dose. Our guide to reading a pre-workout label walks through the panel line by line.
2. BCAAs. Branched-chain amino acids were a pre-workout staple for years. If you eat adequate protein, they are redundant in a scoop of powder, because a serving of whey or a complete plant blend already supplies those same amino acids, leucine included.
3. Artificial dyes. FD&C colors exist so the powder looks vivid in the tub and the drink looks electric in the shaker. They contribute nothing to performance. This is a preference rather than a safety argument, but it is a clean signal about what a brand is optimizing for.
4. Unapproved stimulants. This one is not a preference. The FDA states that DMAA (1,3-dimethylamylamine) "is not a dietary ingredient, and DMAA-containing products marketed as dietary supplements are illegal," and warns that it "can raise blood pressure and lead to cardiovascular problems" (FDA). The agency takes the same position on DMHA, also sold as octodrine, which it considers an unsafe food additive that makes a supplement adulterated (FDA). Both still turn up in products sold online. Check your ingredient list against those two names.
What Makes a Pre-Workout Healthy?
"Healthiest" is not a meaningful category on its own, because a pre-workout is not health food and no amount of formulation makes it one. What you can evaluate is whether a formula is honest about what it contains and restrained about how it gets its effect.
Four questions separate a defensible formula from label theater, and none of them require a chemistry degree. Is every active ingredient you care about listed with its own amount? Is the total caffeine disclosed in milligrams, and is it reasonable against your body mass and the rest of your day? Are the doses in the neighborhood of what the research used? And is the ingredient list short enough that each item could be present at a level that matters?
Applying those four questions to the category is deflating. Most tubs fail the first one. If you would rather skip the powder entirely, a natural pre-workout built from coffee and food clears the same bar for plenty of people.
For the record, here is what is in FitBoost+, taken from the label so you can hold it to the same standard. Three grams of creatine monohydrate and 400 mg of Peak ATP, each listed individually with its own amount. A declared total of 95 mg of caffeine, from a caffeine pterostilbene co-crystal. Sodium at 135 mg, potassium at 215 mg, magnesium at 150 mg. Vitamin C at 500 mg as four mineral ascorbates, B vitamins in bioactive forms, and Albion TRAACS chelated trace minerals. Twenty-five calories, 5 g of carbohydrate, zero sugars, sweetened with stevia leaf extract, with no artificial colors and no artificial sweeteners.
And in the interest of applying our own test honestly: FitBoost+ does carry a 465 mg proprietary blend, holding the caffeine co-crystal alongside whole coffee fruit extract, taurine, L-arginine alpha-ketoglutarate, green tea extract, s-acetyl-L-glutathione, and acetyl-L-carnitine. The caffeine that blend yields is declared on the panel at 95 mg, and the two ingredients most people shop for, creatine and ATP, sit outside the blend with their own numbers. It also contains no beta-alanine and no citrulline, which is a formulation decision rather than an oversight.
How to Take a Pre-Workout
Timing splits along the same lines the ingredients do. Take the stimulant portion before training, in the window the ISSN caffeine position stand describes as most commonly used, 60 minutes out. Take the saturation-dependent portion, meaning creatine and exogenous ATP, every day including rest days, because their effect comes from tissue levels maintained over weeks rather than from a single serving. The FitBoost+ label directs one scoop 30 minutes before training on workout days and in the morning on non-workout days, which is that same logic written as directions. Food runs on its own clock too, and how long before training to eat is worth planning alongside the scoop.
A few practical rules that apply to any product in the category:
- Add up your caffeine from everything. The scoop, the coffee, the energy drink, the dark chocolate. The 400 mg figure is a daily total from all sources, not a per-product allowance.
- Do not stack blind. If your pre-workout already contains creatine, a separate creatine supplement on top may be redundant. Read both panels.
- Move it earlier if you train at night. Caffeine clears slowly, and how slowly varies a lot from person to person. Late sessions are the strongest argument for a stimulant-free option.
- Start with half a scoop. Tolerance to stimulants varies enormously, and a full serving of an unfamiliar product is a bad first experiment.
One safety note belongs on any caffeinated formula, and this one is taken from the FitBoost+ label: consult your healthcare professional before use. Anyone taking medication, especially blood thinners, should discuss potential interactions with their provider. Caffeine should not be combined with synephrine or ephedrine, and anyone with a history of abnormal heart rhythm should use caution. If you are weighing the broader risk picture, we covered it in is pre-workout bad for you.
The Short Version
What is in pre-workout is not much of a mystery. Caffeine, beta-alanine, citrulline, creatine, a few amino acids, and flavoring, in almost every case. What is genuinely hidden is how much of each, and that is the only question worth asking at the shelf.
Read the panel before you read the front of the tub. Check the total caffeine against your body mass and the rest of your day. Check whether the ingredients you are buying the product for are listed with their own numbers or buried in a blend. If they are buried, you are not evaluating a formula. You are trusting a logo.
FitBoost+
Three grams of creatine monohydrate and 400 mg of Peak ATP, each with its own number on the panel. Ninety-five milligrams of declared caffeine from a pterostilbene co-crystal, plus sodium, potassium, and magnesium. Stevia-sweetened. No artificial colors, no artificial sweeteners, nothing to squint at.
Shop FitBoost+
