Pre-Workout
Best-in-class: Advanced Pre-Workout
Thorne Advanced Pre-Workout, NSF Certified for Sport -- which is a real guarantee about banned substances and no guarantee at all about doses. The performance ingredients and the amount of each are not listed on this page.
Pre-Workout quick facts
| Suggested dose | One serving 20–30 min before training. |
| How often | daily |
| Who it's for | Athletes wanting a tested, effective pre-workout. |
The useful test is arithmetic, not marketing: check whether those four appear at studied doses rather than counting how many ingredients the label lists. Proprietary blends exist to hide that they do not. The tingling is beta-alanine and is harmless. Habitual daily use builds caffeine tolerance quickly, which is why people escalate — cycling it or reserving it for hard sessions preserves the effect.
How Pre-Workout actually works
A blend, and it should be judged on whether it contains the four ingredients with real evidence at the doses those trials used: caffeine for adenosine antagonism and reduced perceived exertion, citrulline for nitric-oxide-mediated blood flow, beta-alanine for intracellular buffering, and creatine for phosphocreatine resynthesis. Everything else on a typical label is either underdosed or unevidenced.
Where to get Pre-Workout
Buy Advanced Pre-Workout at Thorne →The evidence for Pre-Workout
Graded by what exists behind each claim.
✅ Clinically validated
- Core ingredients are individually RCT-backed: citrulline for blood flow/reps, beta-alanine for power-endurance, caffeine for performance.
- Third-party tested — clean for drug-tested athletes.
📊 Correlative data
- Acute performance boosts track with the caffeine + citrulline + beta-alanine combination.
🧪 Theoretical / extrapolated benefits
- Blend-level synergy is assumed from the well-studied components.
How to read these tiers: they say how much human evidence exists, not how well something works — and ✗ flags harm, never a disappointing trial. How the evidence tiers work →
What Pre-Workout actually does
A pre-workout is not one product, it is three pharmacologies in a scoop, and they operate on three different timescales. Getting that straight is the whole of what this page can usefully do, because the blend is sold as a single acute event and only one of its main ingredients actually works that way.
Caffeine: an antagonist, not a stimulant. Caffeine is a competitive antagonist at adenosine A1 and A2A receptors. Adenosine accumulates through the waking day and through metabolic work, and acting at A1 it inhibits neurotransmitter release while at A2A it suppresses striatal dopaminergic signaling; blocking those receptors removes an inhibition rather than adding an excitation. The distinction is not pedantic. It predicts tolerance, because chronic antagonism upregulates the receptor; it predicts withdrawal, because an upregulated receptor with no blocker is a sedated state; and it predicts that most of the measured benefit in a habitual consumer is the reversal of that withdrawal Rogers 2003Yeomans 2002. Timescale: 30 to 60 minutes to peak, four to six hours of half-life, and longer in people carrying the slow CYP1A2 variant.
Beta-alanine: a substrate for an enzyme, and the enzyme is slow. Carnosine is the dipeptide beta-alanyl-L-histidine, present in skeletal muscle at millimolar concentrations, and its imidazole ring has a pKa of about 6.8 — almost exactly the intramuscular pH at which fatigue-relevant acidosis develops, which makes it the single most effective physicochemical buffer in the muscle cell. It is synthesized in situ by carnosine synthase, and the rate-limiting substrate is beta-alanine, not histidine. You cannot shortcut this by swallowing carnosine, because serum carnosinase — the CNDP1 gene product — hydrolyzes circulating carnosine within minutes Oppermann 2021. Timescale: muscle carnosine rises over weeks, and a single serving before a session raises nothing Cesak 2023.
And the tingle is not the mechanism. Paraesthesia after beta-alanine is receptor-mediated — beta-alanine is an agonist at MrgprD on cutaneous sensory neurons — and it is entirely separate from the muscle buffering the ingredient is there for. It arrives in minutes; the buffering arrives in weeks.
Citrulline: a transport trick around the liver. Oral arginine is a poor way to raise plasma arginine because intestinal and hepatic arginase degrade most of it on the first pass. Citrulline escapes arginase entirely, is taken up by the proximal renal tubule and converted to arginine by argininosuccinate synthase and argininosuccinate lyase, and therefore raises plasma arginine more effectively than arginine does. Arginine is the substrate for endothelial nitric oxide synthase. Timescale: about an hour to peak plasma arginine, acute.
So the blend contains one acute drug, one chronic substrate and one acute substrate, sold as a single pre-session event. That is the structural fact this category is built on and almost never states.
Cell, rodent, human — and where it stops
Caffeine, in people, and the control group problem. Caffeine improves endurance and repeated-effort performance in trained participants at 3 to 6 mg per kilogram, which is 210 to 420 mg for a 70 kg adult. The complication is who the placebo group are: in habitual consumers withdrawn overnight, much of the apparent benefit is restoration of baseline rather than enhancement, and in genuine non-consumers the mood and psychomotor effects largely disappear Rogers 2003Yeomans 2002. Both of those studies were designed specifically to separate the two, which is why they are cited here rather than a performance meta-analysis.
Beta-alanine, in people, with a dose and a duration. The supplementation literature is consistent that meaningful muscle carnosine loading requires roughly 3.2 to 6.4 g a day for four to twelve weeks, producing increases of the order of 40 to 80% in muscle carnosine, with performance benefits concentrated in efforts of about one to four minutes Cesak 2023. An acute pre-exercise dose of combined carnosine and anserine has been shown to affect initial maximal power in a Wingate test Blancquaert 2021, which is a genuinely acute finding and is not the same intervention as the beta-alanine in a scoop. In metabolic rather than performance settings, carnosine and beta-alanine supplementation has been meta-analyzed for glycemic control with modest results Matthews 2021.
Citrulline, in people, and the honest verdict. A critical review of citrulline malate and exercise performance concludes that the literature is inconsistent, that the commonly used 8 g dose comes from a small early trial, and that the malate component has no established independent effect — which means the evidence base for the ingredient is thinner than its ubiquity suggests Gough 2021.
The specific obstacle: a chronic ingredient in an acute product. Beta-alanine needs 3.2 g a day, every day, for a month Cesak 2023. A pre-workout taken four times a week supplies it four times a week, at whatever the label puts in a scoop, and on training days only. Nobody has established whether that intermittent pattern raises muscle carnosine at all. A reader who feels the tingle believes they have taken beta-alanine; they have, and the buffering claim on the tub still may not apply to how they use it.
The second obstacle is that no filed panel exists for this product. A search of the NIH Dietary Supplement Label Database in September 2026 returned no Supplement Facts filing for a Thorne pre-workout under any of its product names. So unlike every other blend in this cohort Office of Dietary SupplementsOffice of Dietary SupplementsOffice of Dietary Supplements, the amounts cannot be checked against the trials from a public record. That is the honest state of the evidence and it is the reason the section below is about doses rather than about this bottle.
Pre-Workout — which form, and does it matter
Read the label as three numbers and ignore the rest. Caffeine in milligrams; beta-alanine in grams; citrulline in grams, and whether it is citrulline or citrulline malate. Everything else on a pre-workout label — the vitamin blend, the amino acid dusting, the botanical with a trademark — is present at quantities that cannot matter next to those three.
The trial doses, so the arithmetic is available. Caffeine 3 to 6 mg per kilogram of body mass Rogers 2003. Beta-alanine 3.2 to 6.4 g per day, chronic Cesak 2023. Citrulline typically 6 to 8 g of citrulline malate acutely, with the caveat that the dose is inherited from a small trial rather than derived from a dose-response Gough 2021. A scoop containing 1.6 g of beta-alanine and 2 g of citrulline malate — a common commercial specification — is at half and at a quarter of those.
Citrulline against citrulline malate is a real form question. Citrulline malate is usually supplied at a 2:1 ratio, so 8 g of citrulline malate is about 5.3 g of citrulline. Products declaring 6 g of citrulline malate deliver about 4 g of the active. The malate is present because early work proposed a role in the tricarboxylic acid cycle; that role has never been demonstrated to matter in humans Gough 2021.
Carnosine on a label is the form to avoid, and there is an enzyme reason. Serum carnosinase hydrolyzes circulating carnosine within minutes Oppermann 2021, so a product supplying carnosine instead of beta-alanine is paying more to deliver less. Sustained-release beta-alanine exists and reduces the paraesthesia by flattening the peak; it does not change the total dose needed.
The proprietary blend is a form question disguised as a marketing choice. A label that gives a blend total rather than per-ingredient amounts makes every calculation above impossible. There is no legitimate formulation reason for it. A third-party certification such as NSF Certified for Sport tells you the tub does not contain a banned substance; it does not tell you the doses are effective, and those are different guarantees that buyers routinely conflate.
What would have to be true, and how you would know it was not
1. The comparison that actually tests the product: the blend against its own caffeine. Six comparable sessions, alternating: three on the scoop, three on a plain caffeine dose matched to the label's caffeine content, everything else held constant. Score total tonnage — sets times reps times load. Predict the difference is within your own week-to-week noise, because the acute pharmacology of the blend is dominated by the caffeine Rogers 2003Yeomans 2002. This is the prediction that cuts against the product and it costs nothing to run.
2. Beta-alanine, tested on its own timescale, which is the one the tub does not use. Take a fixed set-to-failure protocol at a fixed load, in the 60-to-240-second effort range where carnosine buffering matters, at week 0 and week 6. Predict no change at week 1 and a small improvement by week 6 only if your daily intake reaches 3.2 g every day, training days included Cesak 2023. If your beta-alanine arrives only in a scoop four times a week, predict nothing at either time point.
3. Sleep, measured rather than remembered. Sleep onset latency and total sleep time from any wearable, on days you use it after 3 p.m. against days you do not. Caffeine's half-life is four to six hours, so a 300 mg dose at 5 p.m. leaves a substantial fraction circulating at bedtime. Predict a measurable delay in sleep onset and predict you will not notice it subjectively, which is precisely why it is worth measuring.
4. Resting heart rate and blood pressure on training mornings against rest mornings. Predict a modest rise in both on dosing days. If a product raises resting heart rate by more than about ten beats a minute, the stimulant load is higher than the label suggests and that is worth knowing before a session rather than during one.
What will fool you: arousal. The scoop produces a state — tingling skin, warmth, alertness — that raises your rating of the session while the logbook stays flat. The paraesthesia in particular is a sensory receptor event with no relationship to muscle buffering, and it is the single most convincing placebo cue in sports nutrition.
What nobody has tested yet
Nobody has tested whether pre-workout beta-alanine loads muscle carnosine at all. The loading literature dosed daily for weeks Cesak 2023. The real-world pattern — 1.6 to 3.2 g on training days only, three to five times a week — has never been taken into a muscle biopsy or a magnetic resonance spectroscopy study. That is the most consequential unrun experiment in this category, because it decides whether an ingredient in millions of tubs does anything for the way it is actually used.
Nobody has run a blend against its own components. Every pre-workout trial compares the blend against placebo. The informative designs — blend against matched caffeine, blend against caffeine plus citrulline, full factorial — have not been published for any commercial product. The synergy claim on which the whole category rests has therefore never been tested.
Nobody has established a citrulline dose-response. The common 8 g of citrulline malate comes from early work rather than from a dose-finding study Gough 2021. Four grams against eight against twelve, with repetitions to failure as the endpoint, would tell the industry whether its standard serving is a quarter of an effective dose or twice one.
And nobody has looked at the CYP1A2 genotype question in this setting. Caffeine clearance differs several-fold between fast and slow metabolizers, which changes both the ergogenic window and the sleep cost of an evening session. Genotyping participants in a crossover with performance and actigraphy would turn a well-known pharmacogenetic fact into an actionable one.
Pre-Workout — its own safety story, not its category's
Caffeine addition is the commonest real problem and it is arithmetic. A large scoop plus two coffees plus a pre-training energy drink reaches 600 mg without anybody intending it. Above roughly 400 mg a day most people accumulate sleep debt, and the sleep debt costs more training quality than the stimulant returns. Write down the milligrams for one week before deciding the product is the problem or is not.
Paraesthesia is harmless and it is not a dose signal. Beta-alanine's tingle is MrgprD agonism on skin sensory neurons; it peaks within 20 minutes, is worse on an empty stomach and with a single large dose, and is reduced by splitting the dose or by sustained-release material. It tells you the ingredient is present. It does not tell you the amount is sufficient Cesak 2023.
Yohimbine is the ingredient to check hardest, and the reason is pharmacological. It is an alpha-2 adrenoceptor antagonist, which means it removes the presynaptic brake on noradrenaline release; the consequences are dose-dependent anxiety, tachycardia and blood pressure rise, and they are amplified by the caffeine sitting beside it in the same scoop. It has a narrow margin, it is unpredictable between individuals, and it has no place in a product taken before physical exertion.
A proprietary blend is a safety problem as well as an efficacy one. If the label will not state how much of each ingredient a scoop contains, you cannot add up your caffeine, you cannot judge whether the beta-alanine reaches a loading dose, and you cannot assess any stimulant against a cardiac history. That is sufficient reason to choose a different product, independent of anything else on this page.
What third-party certification does and does not cover. NSF Certified for Sport and Informed Sport test batches against banned substance lists, which is genuinely valuable in a category with a long adulteration history — stimulants and sympathomimetics have repeatedly been found in pre-workout products that did not declare them. Certification does not verify that the declared doses are effective, and no certification program claims it does.
And the one this page cannot check for you. With no filed Supplement Facts panel in the national label database for this product, the caffeine content the card warns you to add up is not publicly verifiable. Read the tub.
Sources read for this page
- Cesak O, et al. Carnosine and Beta-Alanine Supplementation in Human Medicine: Narrative Review and Critical Assessment. Nutrients 2023 · PMID 37049610
- Oppermann H, et al. Erythrocytes Prevent Degradation of Carnosine by Human Serum Carnosinase.. International Journal of Molecular Sciences 2021 · PMID 34884603
- Gough LA, et al. A critical review of citrulline malate supplementation and exercise performance.. European Journal of Applied Physiology 2021 · PMID 34417881
- Rogers PJ, et al. Absence of reinforcing, mood and psychomotor performance effects of caffeine in habitual non-consumers of caffeine. Psychopharmacology 2003 · PMID 12601503
- Yeomans MR, et al. Effects of caffeine on performance and mood depend on the level of caffeine abstinence. Psychopharmacology 2002 · PMID 12424547
- Blancquaert L, et al. Acute preexercise supplementation of combined carnosine and anserine enhances initial maximal power of Wingate tests in humans.. Journal of Applied Physiology 2021 · PMID 33914660
- Matthews JJ, et al. Effect of Carnosine or beta-Alanine Supplementation on Markers of Glycemic Control and Insulin Resistance in Humans and Animals: A Systematic Review and Meta-analysis. Advances in Nutrition 2021 · PMID 34333586
How you would know if it worked
There is no blood test for this one. That is not a criticism — it is a fact about the effect, and it changes how you should judge it.
- What to watch: Session volume — sets and reps at fixed loads — on days you use it against days you do not. And be clear what you are testing: the acute effect of a blend like this is dominated by its caffeine, so the informative comparison is not against nothing, it is against the same dose of caffeine on its own.
- How long before it means anything: Six comparable sessions, three with and three without, alternated rather than run in blocks — otherwise a good week lands entirely on one side and decides the answer for you.
- What will fool you: Arousal. A scoop that makes you feel switched on raises your rating of the session while the numbers in the log stay flat, and the beta-alanine tingle makes the whole thing feel more pharmacological than it is. The second confound is the expensive one: taken late, the caffeine takes the same bite out of that night's sleep, and a week of that outweighs whatever the blend adds in the gym.
Run it one variable at a time. Starting three things in one week means a result you cannot attribute, which is the same as no result.
Pre-Workout — safety & side effects
- Add up the caffeine across everything you take that day, including coffee — overshooting is the commonest problem with these products.
- Beta-alanine tingling is expected and harmless. Yohimbine, if present, is the ingredient to check hardest: it carries real cardiac and anxiety risk.
- Proprietary blends hide doses. If the label will not tell you how much of each ingredient you are taking, you cannot assess it — which is reason enough to choose a different product.
- Products in this category are among the most frequently found adulterated with unlabelled stimulants (DMAA, DMHA and relatives).
The same on every page it applies to. Read it here; it is not repeated research.
- This is one formula with several actives, and it carries the combined safety profile of everything on its panel — the risks do not average out, they add. Check the panel above against anything else you take, because the commonest way to overdose an ingredient is to meet it twice in one day under two different product names.
Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.
- When to take it, and what to take it with
- Which form actually absorbs
- Who it's worth it for
- Best-in-class brand pick
- Coach Cam's stacks and notes
- Fasted or with food, and when in the day
- Morning or night, and why that window
- Around training, or deliberately away from it
- What it must not share a window with
Everything above is free and stays free. Skool is where it becomes a plan — Pre-Workout in an order, with the rest of what you're running.
Unlock in Skool — $10/mo →Bloodwork to run alongside Pre-Workout
Baseline first, then again at 8–12 weeks.
| Marker | What it’s watching for |
|---|---|
| Complete Blood Count (CBC) with Differential | Hemoglobin sets your ceiling for endurance work |
| Ferritin | Low iron limits performance long before anemia shows |
| Total Testosterone | Drops under genuine overreaching |
| Comprehensive Metabolic Panel (CMP) | Kidney and electrolytes under heavy training load |
The Athletic Performance & Recovery panel covers these in one order — 12 markers, $207.90 with the discount applied.
Check results you already have → · All 103 markers A–Z
Pre-Workout — frequently asked questions
What is Pre-Workout?
Thorne Advanced Pre-Workout, NSF Certified for Sport -- which is a real guarantee about banned substances and no guarantee at all about doses. The performance ingredients and the amount of each are not listed on this page.
What is the suggested dose of Pre-Workout?
One serving 20–30 min before training. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.
Where can I find Pre-Workout dosing and the full breakdown?
The suggested dose and the full evidence — clinical, correlative and theoretical — are on this page. What's inside Skool is when to take it, which form actually absorbs, the brand worth buying and Coach Cam's stacks.
Where can I buy Pre-Workout?
Coach Cam sources Pre-Workout from Thorne, with 10% off auto-applied at checkout — use the buy link on this page.
What Pre-Workout is used for
Pre-Workout appears under 1 goal in the goal router.
Related Performance supplements
Where this goes next
The pages here are the frameworks. The protocols — the dosing, the order to correct things in, the week-by-week schedule and what to retest — are inside Skool.