What Is Actually in Your Pre-Workout

Walk through the ingredient list of a typical pre-workout powder and you will find some combination of the following: caffeine anhydrous (150 to 400mg), beta-alanine (1,600 to 3,200mg), citrulline malate (3 to 8g), creatine monohydrate (3 to 5g), taurine (1 to 2g), L-tyrosine (500mg to 2g), betaine anhydrous (1.5 to 2.5g), various B vitamins, and a collection of other ingredients that vary by brand: alpha-GPC, theanine, rhodiola, bioperine, huperzine-A, rauwolscine, and others.

The sheer number of ingredients seems impressive, suggesting a sophisticated, scientifically designed formula. But a closer look at the evidence behind each ingredient reveals a less compelling picture.

The Evidence Reality Check

Caffeine: This is the one ingredient with truly overwhelming evidence for acute performance enhancement. Hundreds of studies confirm that caffeine at 3 to 6mg/kg improves endurance, strength, power, and reduces perceived exertion. Caffeine alone accounts for the majority of the acute performance boost from any pre-workout supplement. If you removed every ingredient except caffeine, most users would notice little to no difference in workout performance.

Beta-alanine: The tingling ingredient. Beta-alanine does have legitimate performance benefits, but only through chronic supplementation (daily loading for 4 or more weeks) that increases intramuscular carnosine levels. The acute dose you take 30 minutes before a workout does not produce the performance benefit. The tingle it causes is paresthesia, a harmless nerve stimulation that has zero correlation with workout performance. Beta-alanine is effective for high-intensity efforts lasting 1 to 4 minutes, but only when loaded daily over weeks, not from a single pre-workout dose.

Citrulline malate: Evidence supports citrulline for increased nitric oxide production and improved blood flow, which can enhance muscular endurance and reduce fatigue during high-repetition training. However, the effective dose is 6 to 8 grams, and many pre-workouts hide the actual dose behind proprietary blends, often providing only 2 to 3 grams, well below the effective threshold.

Creatine: Creatine monohydrate is one of the most well-supported supplements for strength and power, but like beta-alanine, it works through chronic loading (daily supplementation to saturate muscle creatine stores), not from an acute pre-workout dose. Including creatine in a pre-workout is a timing convenience, not a performance strategy. You can take creatine at any time of day with the same effect.

Everything else: Taurine, tyrosine, betaine, alpha-GPC, and most other pre-workout ingredients have either modest evidence, evidence only at doses higher than typically included, or evidence that is inconsistent across studies. They may provide small benefits for some people in some contexts, but none approaches the evidence strength of caffeine.

The Proprietary Blend Problem

The biggest issue with pre-workout supplements is not what they contain but how they disclose it. Proprietary blends, which list a group of ingredients with a total combined weight but do not disclose individual doses, are standard in the pre-workout industry.

A label might read: “Performance Matrix: citrulline malate, beta-alanine, caffeine anhydrous, taurine, L-tyrosine, betaine (8,500mg).” This tells you the combined total is 8,500mg but gives you no way to know how much of each ingredient is present. The citrulline could be 6,000mg (effective) or 1,000mg (useless). The caffeine could be 150mg or 350mg. Without individual doses, you cannot evaluate the product’s efficacy, compare it to competitors, or ensure you are getting safe and effective amounts.

This opacity is by design. It allows manufacturers to include headline ingredients at sub-effective doses while keeping costs low, and to prevent competitors from replicating their formulas. It does not serve the consumer’s interest in any way.

Protein energy drinks, by contrast, tend to have short, transparent ingredient lists. When a product contains 200mg caffeine and 20g protein, both of those numbers are on the label. There is nothing to hide behind.

The Tingle Is Not the Product Working

One of the most effective psychological hooks in pre-workout marketing is beta-alanine paresthesia. That tingling, prickling sensation across your face, neck, and hands that begins 15 to 20 minutes after consuming a pre-workout makes you feel like something powerful is happening. It creates a Pavlovian association between the tingle and being “ready to train.”

But the tingle is not a signal of effectiveness. It is simply beta-alanine activating MrgprD receptors on sensory neurons in the skin. It has no relationship to exercise performance, muscle activation, or any physiological readiness for training. A person who feels no tingle (because their product contains less beta-alanine or they have developed tolerance) gets the same performance benefit from the actual effective ingredients as someone who feels intense paresthesia.

The tingle creates a perception of effectiveness that keeps people buying pre-workouts even when the actual performance benefit comes entirely from the caffeine. It is a sensory marketing tool, not a functional indicator. A protein energy drink that delivers effective caffeine and protein without the theatrical tingle may feel less dramatic, but it is delivering the ingredients that actually matter.

What Pre-Workouts Do Not Provide: Protein

Here is the fundamental gap in the pre-workout concept: pre-workouts contain zero protein. They are entirely focused on the input side of training (energy, focus, blood flow) with no consideration for the output side (recovery, muscle protein synthesis, tissue repair).

This means that after spending $2 to $3 on a pre-workout serving, you still need to buy and consume a separate protein source to support recovery. A protein shake costs another $3 to $5 per serving. A quality protein bar costs $2 to $4. You are now spending $5 to $8 per training session on supplements, carrying multiple products, and managing multiple consumption windows.

A protein energy drink consolidates this into a single product and a single occasion. The caffeine provides the acute performance boost, and the protein provides the recovery substrate. One product, one purchase, one can.

Ingredient Comparison: Pre-Workout vs Prox

Consider a side-by-side comparison of what a typical pre-workout and Prox deliver.

A typical pre-workout provides 200 to 350mg synthetic caffeine, 1,600 to 3,200mg beta-alanine (tingle but no acute benefit), 3 to 8g citrulline (often underdosed in blends), various secondary ingredients at unknown doses, zero protein, zero recovery support, 5 to 15 calories, often with artificial colors and flavors, and requires mixing with water.

Prox provides 200mg natural caffeine from green tea and green coffee, L-theanine for focused energy without jitters, 20g protein from collagen peptides and whey isolate, zero sugar, 90 calories from functional protein, no artificial colors or flavors, no proprietary blends, and is ready to drink with no preparation needed.

The pre-workout has more ingredients. Prox has the ingredients that matter. The pre-workout provides stimulation. Prox provides stimulation plus recovery. The pre-workout requires a separate protein supplement. Prox is the complete solution.

Who Actually Needs a Traditional Pre-Workout

Traditional pre-workouts still have a place for a narrow segment of users. Competitive strength athletes who want maximal vasodilation for competition-day performance may benefit from high-dose citrulline. Endurance athletes doing very high-intensity interval work lasting 1 to 4 minutes may benefit from chronic beta-alanine loading (though they should take it daily, not just pre-workout). Athletes who want the highest possible caffeine dose for competition (5 to 6mg/kg) may need more than 200mg.

But for the typical person who trains 3 to 5 days per week for general fitness, body composition, and health, the marginal benefits of citrulline, beta-alanine, and other pre-workout ingredients beyond caffeine are small to negligible. The two ingredients that deliver the most meaningful, most well-supported benefits for the broadest range of training goals are caffeine and protein. And both are in a single can of Prox.

The Simplicity Advantage

There is value in simplicity that the supplement industry does not want you to appreciate. Fewer ingredients means less potential for interaction effects, easier tracking of what works for you personally, lower risk of contamination or quality issues, and easier label reading and product comparison.

When your pre-workout stack is a single can with five to six recognizable ingredients, you know exactly what you are consuming and can easily assess how it affects your training. When your pre-workout is a powder with 15 to 20 ingredients at undisclosed doses, you have no idea which ingredient is responsible for any effect (positive or negative) you experience.

Simpler. Cleaner. More transparent. More functional. That is the protein energy drink advantage over traditional pre-workouts.

Try Prox →