Pre-Workout Supplements: What Actually Works, What's Filler, and What You're Really Paying For

Pre-workout was one of the top three sellers in my store, every single month, without exception. And I'll be honest — it was also the category that generated the most questions I found genuinely difficult to answer without getting into a conversation the customer didn't necessarily want to have.

The questions went something like: "This one says it has more energy than that one — is it better?" And the real answer was: "It has a proprietary blend that hides the caffeine amount, the citrulline dose is probably half of what the research uses, and you're paying $55 for roughly $12 worth of ingredients." That's not a fun conversation to have when someone is excited about their new tub.

But it's the true one. So here it is in full.

What a Pre-Workout Actually Is

A pre-workout is a multi-ingredient supplement designed to be taken before exercise to enhance performance. In theory, it combines evidence-based performance ingredients into a single convenient product. In practice, the gap between what the best pre-workouts could be and what most of them actually are is significant.

The core promise — improved energy, endurance, strength, and focus during training — is achievable. The ingredients that deliver those outcomes genuinely exist and are well-studied. The problem is that most products either underdose those ingredients, fill the remaining space with cheap or ineffective compounds, or hide everything behind a "proprietary blend" label that makes it impossible to know what you're actually getting.

Understanding what to look for — and what to walk away from — is the difference between a product that actually improves your training and one that just tastes good and makes you tingle.

The Proprietary Blend Problem

This is the single biggest issue in the pre-workout market, and it deserves its own section before we get to the ingredients themselves.

A proprietary blend is a group of ingredients listed together on the label under a single weight — something like "Performance Matrix: 7,500mg" — with the individual amounts of each ingredient hidden. The manufacturer lists what's in it, but not how much of each thing.

Companies claim this protects their "formula" from competitors. And that may be partially true. But the practical effect is that consumers have no way of knowing whether any individual ingredient is dosed at a meaningful level or included at a token amount purely so it can appear on the label.

Here's why that matters: a product could list citrulline, beta-alanine, creatine, and a dozen other ingredients inside a 6,000mg proprietary blend — and if citrulline requires 6,000mg alone for the dose used in research, then by definition every other ingredient in that blend is present at a sub-effective dose. But you'd never know from the label.

What Actually Works — and What Dose You Need

There are five ingredients with strong evidence behind them for pre-workout purposes. Everything else is either weakly supported, redundant, or there to make the label look impressive.

Caffeine — the foundation of every effective pre-workout

Caffeine is the most studied performance-enhancing compound in existence. The research on endurance, strength, power output, and cognitive performance during exercise is overwhelming and consistent. It works by blocking adenosine receptors — the receptors that accumulate during waking hours and create the sensation of fatigue. Block those receptors, and fatigue is delayed, focus sharpens, and the effort of exercise feels more manageable.

The evidence-based performance dose is 3–6mg per kilogram of body weight, taken 30–60 minutes before training. For a 75kg person, that's roughly 225–450mg. Most pre-workouts contain somewhere between 150mg and 300mg — which is adequate for many people, though those on the lighter or heavier ends of the weight spectrum may need to adjust.

The problem isn't that pre-workouts don't contain caffeine. They almost all do. The problem is when the caffeine amount is hidden inside a proprietary blend — because caffeine is cheap, easy to include at any amount, and produces an immediately noticeable effect that makes people feel like the product is "working" regardless of whether any other ingredient is properly dosed.

L-Citrulline — for blood flow and endurance

L-citrulline is converted in the kidneys to arginine, which is then used to produce nitric oxide — a vasodilator that relaxes blood vessels and increases blood flow to working muscles. More blood flow means more oxygen and nutrient delivery during exercise and faster clearance of metabolic waste products. The practical outcomes are improved endurance, reduced muscle fatigue, and better muscle pumps.

The effective dose from research is 6,000–8,000mg of L-citrulline per serving. This is where most pre-workouts fail badly. Many products use citrulline malate — a 2:1 blend of citrulline and malic acid — and dose it at 4,000–6,000mg, which sounds like a lot until you realize only about half of that is actually L-citrulline. At an effective dose, citrulline alone would take up more space than most pre-workout serving sizes allow. This is the ingredient most commonly present at a token level while its name prominently occupies the label.

Beta-Alanine — for muscular endurance

Beta-alanine increases intramuscular carnosine — a buffer that helps neutralize the acid buildup in muscles during high-intensity exercise. This translates directly to delayed muscular fatigue in efforts lasting 60–240 seconds: the final reps of a hard set, the last 200 meters of a sprint, a maximal rowing effort.

The evidence-based dose is 3.2–6.4g per day. Here's the nuance: beta-alanine works through accumulation — daily dosing is what builds muscle carnosine over time, not taking it immediately before a workout. Pre-workout timing is convenient but not essential for beta-alanine specifically. It also causes a harmless but sometimes intense tingling sensation (paresthesia) in the face, ears, and extremities — this is a normal pharmacological response and not a sign that something is wrong, though it surprises people the first time.

Most pre-workouts dose beta-alanine between 1.6g and 3.2g — the lower end of the effective range. Not terrible, but it should be labeled clearly so you can supplement additionally if needed.

Creatine — for strength and power

Creatine monohydrate has more research behind it than any other performance supplement. It increases the availability of phosphocreatine in muscles, which is the fuel source for short, maximal efforts — the kind that characterize weightlifting, sprinting, and high-intensity intervals. The evidence for increases in strength, power output, and lean mass is among the most robust in all of sports nutrition.

The effective dose is 3–5g per day. The important caveat: creatine works through saturation of the muscle creatine pool over time, not through immediate acute effects on the day you take it. Including it in a pre-workout isn't wrong — but taking it at any time of day, consistently, is what actually drives results. If your pre-workout has 3–5g of creatine monohydrate and you take it daily, you're covered. If it has 1g inside a proprietary blend, you're not.

L-Theanine — the overlooked addition

L-theanine is an amino acid found naturally in tea that promotes calm, focused alertness without sedation. When combined with caffeine, it smooths the stimulant's edge — reducing jitteriness and anxiety while preserving and in some cases enhancing the cognitive focus that caffeine produces. The evidence-based ratio is roughly 1:1 to 2:1 theanine to caffeine: if your pre-workout has 200mg caffeine, 200–400mg of theanine is the target.

Most pre-workouts either omit theanine entirely or include a token 50–100mg. Products that include it at a meaningful dose tend to produce a noticeably smoother energy curve — less of the hard edge and more of the sustained, clear focus that makes training feel productive rather than frantic.

What's Mostly Filler

The rest of a typical pre-workout label tends to fall into a few familiar categories of things that sound impressive, cost the manufacturer almost nothing, and contribute little to what you're actually paying for.

BCAAs in a pre-workout. Branched-chain amino acids — leucine, isoleucine, valine — are sometimes included in pre-workouts to suggest muscle-preservation benefits. If you eat adequate protein throughout the day, you don't need BCAA supplementation. Your muscles have the amino acids they need. And even if you were BCAA-deficient, the amounts included in most pre-workouts — typically 2–5g — are small relative to what you'd get from a single meal. BCAAs on a pre-workout label is a cost-effective way to add words to the ingredient list.

Megadosed B vitamins. Many pre-workouts include B12 at 1,000% or more of the daily value, often alongside B6, niacin, and others. The implication is that these drive energy production. They do — but only if you're deficient in them, and most people eating a reasonable diet are not. Beyond sufficiency, more B vitamins don't produce more energy. They're also water-soluble, so excess is excreted. The real value here is mostly marketing: a long vitamin list makes the product look comprehensive.

Vague "focus" or "nootropic" blends. Ingredients like huperzine A, alpha-GPC, or lion's mane are sometimes included at doses far below what the research uses for cognitive effects. They're not useless compounds — they just need to be dosed appropriately to do anything. At 50–100mg inside a broader blend, they're decorating the label. When these appear in a proprietary blend within a pre-workout, they're almost certainly present at token levels.

Artificial colorants and flavoring agents. Not harmful for most people, but worth noting that a meaningful portion of your serving size by weight is flavor system — the reason the product is neon-colored and tastes like watermelon candy. This doesn't reduce the effectiveness of a well-dosed product, but it does mean that "10g serving" overstates how much active ingredient you're actually getting.

Build Your Own — For Less

If the above has made you skeptical of pre-packaged pre-workouts, the alternative is simple: buy the individual ingredients and mix them yourself. This is what I quietly recommended to customers who asked what I actually did.

The five ingredients above — caffeine, citrulline, beta-alanine, creatine, and theanine — can all be purchased as unflavored powders or capsules from reputable manufacturers at a fraction of the cost of a branded pre-workout. Properly dosed from individual sources, you'll pay somewhere in the range of $0.50–$1.00 per serving for a stack that outperforms most $50–60 pre-workouts on the market.

The trade-off is convenience and flavor. Mixing five powders isn't as simple as scooping a single product, and unflavored citrulline and beta-alanine aren't particularly pleasant on their own. But if performance is the goal and you're willing to spend 90 seconds on preparation, it's the most cost-effective and transparent approach available.

At minimum — even if you want a pre-made product — this knowledge gives you a benchmark for evaluating what you're buying. You now know the doses to look for and what constitutes a label worth trusting.

What to Look for in a Pre-Made Product

If you prefer the convenience of a ready-made pre-workout, these are the non-negotiables:

Full label transparency. Every ingredient listed individually with its exact amount. No proprietary blends, no hidden matrices, no "energy complex" that doesn't itemize what's in it. This is a hard filter — don't compromise on it.

Citrulline dosed at 6g or above. This is the most commonly underdosed ingredient and the easiest one to check. If the label shows citrulline malate at 4g, that's roughly 2.7g of actual citrulline — well below the effective range. Look for 6g+ of L-citrulline specifically, not citrulline malate.

Caffeine amount clearly stated. You should know exactly how much caffeine you're consuming per serving. This matters for managing tolerance, avoiding sleep disruption from late-afternoon sessions, and stacking with other stimulants.

Reasonable serving size. If a product claims to deliver 10+ effective ingredients in a 7g scoop, something is being underdosed. Citrulline alone at an effective dose takes up 6g of that. Do the math.

Third-party testing certification. Look for NSF Certified for Sport, Informed Sport, or Informed Choice logos. These indicate the product has been independently tested to verify that what's on the label is what's in the product, and that it's free from banned substances. If you're competing in any tested sport, this is not optional.

One More Thing: Tolerance

The most common complaint I heard from long-term pre-workout users was that it "stopped working." The stimulant effect felt blunted, the energy wasn't there, and they were eyeing the double-scoop option.

This is almost entirely a caffeine tolerance issue. Your adenosine receptors up-regulate in response to chronic caffeine exposure — meaning you need more caffeine to achieve the same level of receptor blockade. The solution isn't a higher dose. It's cycling off caffeine periodically to allow receptor sensitivity to reset.

A 10–14 day caffeine break every 2–3 months — or even a simple reduction to one low-dose serving per day — is enough to meaningfully restore sensitivity. It's uncomfortable for the first few days. It's worth it. The alternative is a slow escalation of caffeine intake that produces diminishing returns and eventually contributes to the cycle of dependence that makes people feel they can't train without a pre-workout at all.

The best pre-workout is one you can take for years at a consistent, effective dose — not one you're chasing with ever-increasing amounts to recapture an effect that has quietly disappeared.