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Pre-Workout Ingredient Dosage Guide: Studied Doses, Timing, and Evidence
Disclosure: Connor Southworth owns 4 Gauge, which sells pre-workout and other sports supplements. This guide discusses ingredients both used and not used in 4 Gauge.
Pre-workout ingredient doses make sense only when you know the form, regimen, and outcome studied. Caffeine can affect performance during the workout in which it is taken. Creatine and beta-alanine are generally studied through consistent supplementation that changes muscle stores over time. Their amounts cannot be evaluated using the same rules. [1, 2, 3]
This guide compares research protocols for caffeine, citrulline, dietary nitrates, creatine, beta-alanine, betaine, taurine, L-theanine, and L-tyrosine.
The amounts below are research references, not universal recommendations or instructions to combine these ingredients. A studied dose is not necessarily an effective dose, an optimal dose, or an appropriate dose for you.
What to know before comparing doses
- The regimen matters. Taking an ingredient once before exercise does not reproduce a study that used daily supplementation for weeks.
- The form matters. Citrulline malate includes malate; beetroot powder contains more than nitrate. Their total weights do not tell you the amount of the component you are trying to compare.
- More is not automatically better. Higher amounts can increase side effects, and some dose comparisons show no additional performance benefit. [1, 2, 7, 19, 22]
For definitions of unfamiliar ingredients and label terms, see our pre-workout ingredient glossary.
Acute pre-workout doses: what researchers have tested
Acute use means taking a dose for its effects during a particular exercise session or test. Inclusion in this table does not mean the ingredient has a proven workout benefit.
The examples are selective. They do not represent every dose tested.
Swipe to compare all columns.
| Ingredient | Form studied | Studied dose or protocol | Timing used | Evidence and limitations | Sources |
|---|---|---|---|---|---|
| Caffeine | Frequently caffeine anhydrous in capsules; other delivery forms also studied | 3–6 mg/kg of body weight is a common exercise-research range. Some benefits occur at lower doses; a universal minimum is unclear. | Often 60 minutes before exercise; timing varies with delivery form and event. | Substantial evidence for several performance outcomes, particularly endurance. Responses vary, and higher doses increase the likelihood of side effects. | ISSN position stand, 2021. [1] |
| L-citrulline | Pure L-citrulline | One resistance-exercise trial tested 8 g as a single dose. This is an example, not an established target. | 60 minutes before testing in that trial. | The study found no improvement in isometric force or bench-press performance. An amount being studied does not establish its effectiveness. | Human trial, 2023. [4] |
| Citrulline malate | Citrulline combined with malate; ratios and composition vary | 6–8 g as a single dose in trials included in a resistance-training meta-analysis. | 40–60 minutes before exercise in those trials. | Some analyses find small benefits, such as more repetitions. Results vary. A 2026 review rated evidence certainty low to very low and did not establish a reliable optimal dose. | Repetition-performance meta-analysis, 2021; broader meta-analysis, 2026. [5, 6] |
| Dietary nitrate | Nitrate-rich beetroot juice or nitrate salts with quantified nitrate content | A 2022 expert consensus identified 8–16 mmol nitrate, approximately 496–992 mg, as an acute protocol. Individual trials have tested other amounts. | 2–4 hours before exercise in the consensus guidance. | Benefits depend on exercise demands and fitness level; they appear less consistent in highly aerobically trained athletes. These are amounts of nitrate, not beetroot powder. | Expert consensus, 2022. [7] |
| Taurine | Isolated taurine in capsules or beverages | Single doses commonly within 1–6 g in the trials summarized by a 2025 meta-analysis. | Timing varied; approximately one hour before exercise was explored. An optimum remains uncertain. | The analysis found an average performance benefit, but no significant dose-response relationship within the common range. Its apparent timing advantage was not robust in sensitivity analyses. | Acute-use meta-analysis, 2025. [8] |
| L-theanine | L-theanine, often combined with caffeine | Examples include 100 mg with 50 mg caffeine, and 200 mg with 160 mg caffeine. | Cognitive outcomes were assessed during the first and second hours after consumption across studies. | Some attention-task benefits are supported. These studies do not establish better lifting performance, an ideal caffeine-to-theanine ratio, or guaranteed protection from caffeine side effects. | Human trial, 2008; systematic review, 2025. [9, 10] |
| L-tyrosine | L-tyrosine | One working-memory study tested 2 g as a single dose. | Testing began approximately 60 minutes after intake. | Some findings concern cognition under demanding conditions. Evidence is insufficient to establish a reliable exercise-performance dose. | Working-memory trial, 2013; evidence assessment, 2015. [11, 12] |
Reading the caffeine units: mg/kg means milligrams per kilogram of body weight. Multiplying a research dose by body weight describes the study protocol; it does not establish your personal caffeine requirement.
Daily supplementation: dose and consistency work together
A daily protocol includes intake on rest days. Taking an ingredient only when you use pre-workout can produce a different regimen from the one studied.
Swipe to compare all columns.
| Ingredient | Form studied | Studied dose and regimen | Timing or consistency | Evidence and limitations | Sources |
|---|---|---|---|---|---|
| Creatine | Creatine monohydrate | Common maintenance protocols use 3–5 g/day. Optional loading uses approximately 0.3 g/kg/day for 5–7 days, divided into doses, followed by maintenance. | Consistent daily intake. A precise best time relative to exercise remains uncertain. | Strong evidence for repeated high-intensity exercise and training adaptations. Loading is optional; lower daily intake raises stores more gradually. Creatine is not an immediate stimulant. | ISSN position stand, 2017; timing review, 2022. [2, 16] |
| Beta-alanine | Beta-alanine; conventional and sustained-release formulations | The ISSN position stand describes 4–6 g/day, generally for at least four weeks to build muscle carnosine. | Daily intake, often divided into smaller doses. Immediate pre-workout timing is not its main mechanism. | Benefits are most relevant to particular high-intensity efforts, including tasks lasting roughly 1–4 minutes. Tingling is separate from the performance mechanism. | ISSN position stand, 2015. [3] |
| Betaine | Betaine anhydrous, also called trimethylglycine or TMG | One resistance-training trial used 2.5 g/day for six weeks, divided into two 1.25 g doses. | Repeated daily supplementation in that protocol. | A 2024 meta-analysis found a maximal-strength benefit, particularly for the lower body, but not significant benefits across several other performance outcomes. Betaine hydrochloride should not be treated as an equivalent exercise ingredient. | Human trial, 2013; meta-analysis, 2024. [13, 14, 15] |
| L-citrulline | Pure L-citrulline | One cycling trial used 2.4 g/day for seven days, then another 2.4 g on day eight. | The final dose was taken one hour before a cycling time trial. | That small trial reported a benefit. A broader 2022 meta-analysis found no significant overall aerobic-performance benefit, illustrating the limits of relying on one positive study. | Human trial, 2016; meta-analysis, 2022. [17, 18] |
| Dietary nitrate | Products with quantified nitrate content | The 2022 consensus described 4–16 mmol/day, approximately 248–992 mg nitrate, in repeated supplementation protocols. | Courses lasting several days or weeks; final dose 2–4 hours before exercise. | Fitness and exercise type influence results. These protocols do not establish the safety or usefulness of indefinite high-dose supplementation. | Expert consensus, 2022. [7] |
How to compare pre-workout doses accurately
1. Compare the actual ingredient form
Six grams of citrulline malate is not six grams of pure L-citrulline.
For a citrulline-to-malate ratio of 2:1 by weight, the nominal breakdown is:
| Listed amount | Nominal L-citrulline content |
|---|---|
| 6 g pure L-citrulline | 6 g |
| 6 g citrulline malate, 2:1 | 4 g |
| 8 g citrulline malate, 2:1 | Approximately 5.3 g |
These calculations assume the stated ratio is accurate. They do not verify a product's composition or establish that either form produces a particular benefit. Research has identified inconsistencies between some manufacturers' stated ratios and measured composition. [19]
Check the complete ingredient name and ratio before comparing the gram amounts.
2. Separate beetroot weight from nitrate content
A label stating 300 mg of beetroot powder tells you the powder's weight. It does not tell you that the serving provides 300 mg of nitrate.
To compare a product with nitrate research, you need its disclosed or measured nitrate content. Without that information, you cannot reliably match its beetroot ingredient to a nitrate-standardized study protocol. [7]
3. Compare the whole regimen
An ingredient can appear on a pre-workout label even when its main research protocols involve daily supplementation.
For example, creatine research has shown that 3 g/day for 28 days can raise muscle stores similarly to a faster loading protocol. An occasional serving before training does not reproduce that daily regimen. [20]
Beta-alanine also works through changes that accumulate with regular intake. The tingling some people feel shortly after taking it does not measure how much muscle carnosine they have accumulated. [3]
When comparing products, ask:
- How much does one serving contain?
- Was the research based on one dose or repeated intake?
- How long did participants take it?
- Does my intended use resemble that protocol?
Do not take extra servings of a multi-ingredient pre-workout to imitate a creatine or beta-alanine protocol. Extra servings also increase caffeine and every other ingredient.
4. Match the claim to the outcome studied
“Focus,” “strength,” “endurance,” and “muscle pump” are different outcomes.
L-theanine plus caffeine has shown benefits on some laboratory attention tasks. L-tyrosine has been investigated for cognition under demanding conditions. Those findings do not automatically establish more repetitions, greater strength, or better exercise performance. [10, 12]
Citrulline provides another useful example: a 2026 review found a small average performance benefit for citrulline malate, but considerable uncertainty remained. Its findings did not establish a dependable optimal dose or timing strategy. [6]
A plausible mechanism and a positive result on one test are useful pieces of evidence. They are not proof of every claim associated with an ingredient.
5. Keep caffeine research separate from daily intake guidance
A research protocol using 3–6 mg/kg caffeine can produce a substantial amount. For an 80 kg adult, that calculation equals 240–480 mg. This illustrates the protocol; it is not a recommendation to take that amount. [1]
The FDA cites 400 mg per day as an amount not generally associated with negative effects for most adults. That is daily intake across sources, not a suggested pre-workout serving or a guarantee that someone will tolerate it. [21]
Include coffee, tea, energy drinks, supplements, and other caffeine sources when considering total exposure. Individual sensitivity, sleep timing, medications, and health conditions also matter.
For more detail, see how much caffeine should be in pre-workout.
6. Do not assume a larger dose produces a larger benefit
A dose-response relationship must be demonstrated.
The 2025 taurine meta-analysis did not find a significant dose-response relationship within the commonly used 1–6 g range. That does not prove all doses are equivalent, but it does challenge the assumption that more necessarily works better. [8]
In one small beetroot-juice study, 16.8 mmol nitrate did not improve exercise tolerance more than 8.4 mmol, despite further changes in some physiological measures. That finding is specific to the trial, but it shows why more of a biomarker change does not necessarily mean more performance improvement. [22]
Applying the guide to the 4 Gauge label
The current 4 Gauge Supplement Facts panel lists a serving as one 10 g scoop.
Here is how selected ingredients compare with the distinctions in this guide:
| Ingredient | Listed amount per serving | How to interpret it |
|---|---|---|
| L-citrulline DL-malate 2:1 | 6,000 mg | This is the combined citrulline-malate weight. It should not be described as 6,000 mg of pure L-citrulline. |
| Creatine monohydrate | 1,000 mg | This contributes creatine, but is below the commonly studied 3–5 g daily maintenance amount. |
| L-theanine | 200 mg | An amount appearing in human cognitive research. Its inclusion does not guarantee better exercise performance or freedom from caffeine side effects. |
| Caffeine anhydrous | 150 mg | Count it toward total daily caffeine intake and consider individual sensitivity. |
| Red beetroot | 300 mg | The panel does not disclose a nitrate amount, so this cannot be matched directly to nitrate research doses. |
Label quantities checked against the current product panel on October 5, 2026. Research comparisons use the sources above. [7, 10, 20, 23, 24]
You can view the current 4 Gauge ingredient panel and apply the same comparisons to another product.
Ingredient research does not establish that the finished 4 Gauge formula reproduces those findings. That requires research on the actual formula and regimen. The same limitation applies to other multi-ingredient products. [15]
What dosage tables cannot tell you
Matching a study amount is only one part of evaluating a supplement.
You also need to consider who participated, how they trained, what outcome was measured, and how reliable the research was. Many sports-supplement trials have small samples, short durations, and limited representation of different populations.
A transparent label makes comparison easier. It does not independently verify ingredient purity, manufacturing accuracy, or effectiveness. [15]
Our guide to proprietary blends versus fully disclosed formulas explains that distinction.
Frequently asked questions
Is there one ideal pre-workout ingredient dose?
No. An appropriate amount depends on the ingredient, form, intended outcome, regimen, and person. For several ingredients, research has not established a reliable optimal dose.
Does “clinically dosed” mean a pre-workout is proven to work?
The phrase alone does not establish effectiveness. Ask which study supports the amount, whether the ingredient form and regimen match, and whether the finished formula itself was tested. [15]
Should I take pre-workout on rest days for creatine?
You do not need a caffeinated pre-workout to follow a daily creatine protocol. Creatine can be taken separately, allowing its daily intake to be managed independently of caffeine. [20]
Does stronger tingling mean beta-alanine is working better?
No. Tingling is not a measure of performance benefit or muscle carnosine stores. See why pre-workout makes you tingle. [3]
Safety and practical context
Use these tables to understand research and compare labels. Follow product directions rather than copying a high-dose experimental protocol or combining multiple products to reach a table value.
Discuss supplement use with a qualified healthcare professional if you have a medical condition or take medication. Pregnancy and breastfeeding also change caffeine considerations. Caffeine can cause jitters, anxiety, palpitations, digestive symptoms, and sleep disruption, including at amounts some other people tolerate. [21]
For practical symptom guidance, see pre-workout side effects: causes and what to do. Explore additional ingredient resources in the 4 Gauge Research Hub.
Sources
The tables summarize selected human research and published guidance. They are not an exhaustive list of all doses tested. Product sources establish label quantities; they do not independently establish performance benefits. Research checked October 5, 2026.
- Caffeine: International society of sports nutrition position stand: caffeine and exercise performance. Journal of the International Society of Sports Nutrition, 2021. Read source.
- Creatine: International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 2017. Read source.
- Beta-alanine: International society of sports nutrition position stand: Beta-Alanine. Journal of the International Society of Sports Nutrition, 2015. Read source.
- Acute pure L-citrulline trial: Acute Effect of L-Citrulline Supplementation on Resistance Exercise Performance and Muscle Oxygenation in Recreationally Resistance Trained Men and Women. Journal of Functional Morphology and Kinesiology, 2023. Read source.
- Citrulline malate and repetitions: Acute Effect of Citrulline Malate on Repetition Performance During Strength Training: A Systematic Review and Meta-Analysis. International Journal of Sport Nutrition and Exercise Metabolism, 2021. Read source.
- Citrulline malate evidence update: Effects of Citrulline Malate Supplementation on Exercise Performance: A Systematic Review and Three-Level Meta-Analysis. Nutrients, 2026. Read source.
- Nitrate protocols: Dietary Inorganic Nitrate as an Ergogenic Aid: An Expert Consensus Derived via the Modified Delphi Technique. Sports Medicine, 2022. Read source.
- Acute taurine: Does One Shot Work? The Acute Impact of a Single Taurine Dose on Exercise Performance: A Meta-Analytic Review. Scandinavian Journal of Medicine & Science in Sports, 2025. Read source.
- Theanine plus caffeine trial: The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 2008. Read source.
- Theanine evidence synthesis: Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrition Reviews, 2025. Read source.
- Tyrosine cognitive trial: Working Memory Reloaded: Tyrosine Repletes Updating in the N-Back Task. Frontiers in Behavioral Neuroscience, 2013. Read source.
- Tyrosine evidence assessment: Tyrosine for Mitigating Stress and Enhancing Performance in Healthy Adult Humans, a Rapid Evidence Assessment of the Literature. Military Medicine, 2015. Read source.
- Betaine daily protocol: Effects of betaine on body composition, performance, and homocysteine thiolactone. Journal of the International Society of Sports Nutrition, 2013. Read source.
- Betaine evidence synthesis: Effects of chronic betaine supplementation on exercise performance: Systematic review and meta-analysis. Journal of Sports Sciences, 2024. Read source.
- General evidence and safety context: NIH Office of Dietary Supplements, Dietary Supplements for Exercise and Athletic Performance — Health Professional Fact Sheet. Read source.
- Creatine timing: Creatine O'Clock: Does Timing of Ingestion Really Influence Muscle Mass and Performance? Frontiers in Sports and Active Living, 2022. Read source.
- Repeated L-citrulline trial: Oral L-citrulline supplementation enhances cycling time trial performance in healthy trained men: Double-blind randomized placebo-controlled 2-way crossover study. Journal of the International Society of Sports Nutrition, 2016. Read source.
- Citrulline aerobic-performance synthesis: Effects of Citrulline Supplementation on Different Aerobic Exercise Performance Outcomes: A Systematic Review and Meta-Analysis. Nutrients, 2022. Read source.
- Citrulline-malate formulation limitations: A critical review of citrulline malate supplementation and exercise performance. European Journal of Applied Physiology, 2021. Read source.
- Creatine protocols: Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition, 2021. Read source.
- Caffeine intake context: FDA, Spilling the Beans: How Much Caffeine is Too Much? Read source.
- Nitrate dose comparison: Beetroot juice and exercise: pharmacodynamic and dose-response relationships. Journal of Applied Physiology, 2013. Read source.
- Product-label context: 4 Gauge, current pre-workout product page. Checked October 5, 2026. This commercial source is used for product facts, not independent performance evidence. View source.
- Supplement Facts: 4 Gauge, Supplement Facts image displayed on the product page at the time of research. Checked October 5, 2026. View panel.
