Introduction

Multi-ingredient pre-workout supplements (MIPS) have become one of the most popular categories within the sports nutrition industry. Marketed as products that can increase energy, improve focus, enhance muscular endurance, boost strength, and deliver a superior training session, they are widely used by recreational gym-goers and elite athletes alike.

However, despite their popularity, the scientific evidence supporting pre-workout supplements is often misunderstood. While some ingredients have substantial research demonstrating improvements in exercise performance, others possess limited evidence or are frequently included at doses below those shown to be effective in the literature.

Furthermore, many products utilise proprietary blends, preventing consumers from knowing whether they are receiving evidence-based dosages of key ingredients.

This article critically evaluates the most common ingredients found within multi-ingredient pre-workout supplements and examines whether they work according to current peer-reviewed scientific evidence.

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What Are Multi-Ingredient Pre-Workout Supplements?

Multi-ingredient pre-workout supplements are formulations designed to be consumed before exercise and typically contain a combination of:

• Stimulants
• Amino acids
• Ergogenic aids
• Nootropics
• Vitamins and minerals

The rationale behind these products is that combining multiple ingredients may produce synergistic effects that enhance both physical and cognitive performance.

Research suggests that some MIPS can improve training volume, muscular endurance, anaerobic performance and subjective feelings of energy (Jagim et al., 2019). However, many of these benefits appear to be driven primarily by a small number of evidence-based ingredients.

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Caffeine

What is it?

Caffeine is a naturally occurring stimulant found in coffee, tea, cocoa and numerous sports supplements.

Does it work?

Yes.

Caffeine is arguably the most effective acute ergogenic aid available to athletes. Numerous systematic reviews and meta-analyses have demonstrated improvements in:

• Strength
• Power output
• Muscular endurance
• Sprint performance
• Endurance performance
• Cognitive function
• Alertness and reaction time

Caffeine acts primarily through antagonism of adenosine receptors within the central nervous system, reducing perceptions of fatigue and increasing alertness (Guest et al., 2021).

A meta-analysis by Grgic et al. (2020) concluded that caffeine supplementation significantly improves maximal strength and muscular power across a range of exercise modalities.

Effective Dose

Current recommendations suggest:

3–6 mg·kg⁻¹ body mass

Consumed approximately 30–60 minutes before exercise (Guest et al., 2021).

For a 75 kg athlete this equates to approximately 225–450 mg of caffeine.

Verdict

★★★★★

Strong evidence.

If a pre-workout supplement improves performance acutely, caffeine is often the primary reason.

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Beta-Alanine

What is it?

Beta-alanine is a non-essential amino acid that increases intramuscular carnosine concentrations.

Carnosine acts as an intracellular buffer, helping to reduce the accumulation of hydrogen ions during intense exercise.

Does it work?

Yes, but not immediately.

Unlike caffeine, beta-alanine does not provide an acute performance benefit following a single serving. Instead, benefits occur following chronic supplementation over several weeks.

Research suggests improvements in exercise lasting approximately 60–240 seconds, where metabolic acidosis contributes to fatigue (Saunders et al., 2017).

The tingling sensation commonly associated with beta-alanine supplementation (paresthesia) is harmless but unrelated to performance enhancement.

Effective Dose

3.2–6.4 g per day

For at least 4–8 weeks (Trexler et al., 2015).

Verdict

★★★★☆

Strong evidence for chronic use.

Less relevant as an acute pre-workout ingredient.

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Citrulline Malate

What is it?

Citrulline is a non-essential amino acid involved in nitric oxide production.

Nitric oxide promotes vasodilation, potentially increasing blood flow and nutrient delivery to working muscles.

Does it work?

Current evidence suggests that citrulline supplementation can:

• Increase training volume
• Reduce perceived fatigue
• Improve muscular endurance
• Enhance recovery between repeated efforts

A systematic review by Trexler et al. (2019) reported that citrulline may improve resistance training performance, particularly during higher-volume sessions.

Effective Dose

6–8 g citrulline malate

or

6 g L-citrulline

Consumed approximately 60 minutes before exercise.

Common Problem

Many commercial pre-workout products contain substantially less than the recommended dosage, limiting the likelihood of meaningful physiological benefits.

Verdict

★★★★☆

Good evidence when adequately dosed.

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Creatine Monohydrate

What is it?

Creatine is a naturally occurring compound stored within skeletal muscle as phosphocreatine.

Its primary role is to facilitate rapid ATP regeneration during high-intensity exercise.

Does it work?

Absolutely.

Creatine is one of the most extensively researched sports supplements available and consistently demonstrates improvements in:

• Strength
• Power
• Sprint performance
• Lean mass gains
• Training adaptations

A comprehensive review by Kreider et al. (2022) concluded that creatine remains one of the safest and most effective nutritional supplements for improving exercise capacity and increasing lean tissue mass.

Effective Dose

3–5 g daily

Timing is considerably less important than consistent daily consumption.

Verdict

★★★★★

Exceptional evidence.

One of the few supplements that consistently improves training adaptations.

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Betaine

What is it?

Betaine (trimethylglycine) is a naturally occurring compound found in foods such as beetroot and spinach.

It functions as an osmolyte and methyl donor within the body.

Does it work?

Research remains mixed.

Some studies have demonstrated improvements in:

• Muscular endurance
• Power production
• Training volume

However, evidence remains less consistent than that supporting caffeine or creatine.

Effective Dose

Approximately 2.5 g daily.

Verdict

★★★☆☆

Promising but requires further investigation.

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Taurine

What is it?

Taurine is an amino acid involved in numerous physiological processes including:

• Muscle contraction
• Calcium regulation
• Cellular hydration
• Antioxidant defence

Does it work?

Evidence suggests taurine may improve endurance performance and reduce fatigue under certain conditions.

However, findings remain inconsistent and effects appear relatively modest compared with caffeine or creatine.

Effective Dose

1–3 g prior to exercise.

Verdict

★★★☆☆

Potentially beneficial but not a primary performance enhancer.

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L-Tyrosine

What is it?

Tyrosine is a precursor for dopamine, adrenaline and noradrenaline.

It is often included in pre-workout supplements to improve focus and cognitive performance.

Does it work?

Tyrosine appears most effective during situations involving:

• Mental fatigue
• Sleep deprivation
• Psychological stress

Evidence supporting direct improvements in physical performance is limited.

Effective Dose

500–2000 mg pre-exercise.

Verdict

★★★☆☆

May support cognitive performance rather than physical performance.

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B Vitamins

What are they?

Many pre-workout supplements contain large doses of:

• Vitamin B6
• Vitamin B12
• Niacin
• Riboflavin

Manufacturers often market these ingredients as “energy boosters.”

Do they work?

Not in individuals who are already meeting nutritional requirements.

B vitamins play essential roles in energy metabolism, but supplementation beyond physiological requirements does not appear to enhance exercise performance in healthy individuals.

Verdict

★★☆☆☆

Important for health but unlikely to improve performance unless a deficiency exists.

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The Problem with Proprietary Blends

One of the greatest concerns surrounding many commercial pre-workout supplements is the use of proprietary blends.

These blends allow manufacturers to disclose the total weight of a mixture without revealing individual ingredient quantities.

Consequently, consumers cannot determine whether evidence-based dosages are present.

Research analysing commercially available pre-workout supplements found that many ingredients are under-dosed relative to scientifically supported recommendations (Jagim et al., 2019).

When selecting a pre-workout supplement, transparency is often a positive indicator of product quality.

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Should Athletes Use Pre-Workout Supplements?

For athletes, context is critical.

Before Strength Training

A caffeine-containing pre-workout may improve:

• Training quality
• Power output
• Resistance training performance

Before Technical Training

Benefits may be smaller, particularly if training intensity is moderate.

Before Matches

Caffeine can enhance performance, but individual tolerance must be assessed carefully.

Potential drawbacks include:

• Gastrointestinal discomfort
• Increased anxiety
• Sleep disruption following evening fixtures

For many players, targeted caffeine supplementation may be more appropriate than a highly stimulant-based pre-workout product.

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Practical Recommendations

When evaluating a pre-workout supplement, look for:

Ingredient

Evidence-Based Dose

Caffeine

3–6 mg·kg⁻¹

Creatine Monohydrate

3–5 g daily

Beta-Alanine

3.2–6.4 g daily

Citrulline Malate

6–8 g

Betaine

2.5 g

Taurine

1–3 g

Be cautious if:

• Ingredient amounts are hidden
• Proprietary blends dominate the label
• Marketing claims exceed the available scientific evidence

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Conclusion

Multi-ingredient pre-workout supplements can improve exercise performance, but their effectiveness depends largely on the ingredients and dosages they contain.

The strongest evidence supports caffeine, creatine monohydrate, beta-alanine and citrulline. These ingredients have consistently demonstrated meaningful performance benefits within peer-reviewed research.

Many other ingredients commonly found in pre-workout supplements show promise, but currently possess weaker evidence bases.

Rather than selecting a product based on marketing claims, athletes should evaluate supplements according to transparent labelling and evidence-based dosing strategies.

Ultimately, no pre-workout supplement can compensate for poor nutrition, inadequate sleep, or suboptimal training. Supplements should enhance an already robust performance programme rather than serve as its foundation.

References

Grgic, J., Trexler, E.T., Lazinica, B. and Pedisic, Z. (2020) ‘Effects of caffeine intake on muscle strength and power: A systematic review and meta-analysis’, Journal of the International Society of Sports Nutrition, 17(1), pp. 1–10.

Guest, N.S., VanDusseldorp, T.A., Nelson, M.T., Grgic, J., Schoenfeld, B.J., Jenkins, N.D.M., Arent, S.M., Antonio, J., Stout, J.R., Trexler, E.T. and Smith-Ryan, A.E. (2021) ‘International Society of Sports Nutrition Position Stand: Caffeine and Exercise Performance’, Journal of the International Society of Sports Nutrition, 18(1), pp. 1–37.

Jagim, A.R., Harty, P.S., Camic, C.L. and Kerksick, C.M. (2019) ‘Common ingredient profiles of multi-ingredient pre-workout supplements’, Nutrients, 11(2), pp. 254–266.

Kreider, R.B., Kalman, D.S., Antonio, J., Ziegenfuss, T.N., Wildman, R., Collins, R., Candow, D.G., Kleiner, S.M., Almada, A.L. and Lopez, H.L. (2022) ‘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, 19(1), pp. 1–46.

Saunders, B., Elliott-Sale, K., Artioli, G.G., Swinton, P.A., Dolan, E., Roschel, H., Sale, C. and Gualano, B. (2017) ‘β-Alanine supplementation to improve exercise capacity and performance: A systematic review and meta-analysis’, British Journal of Sports Medicine, 51(8), pp. 658–669.

Trexler, E.T., Smith-Ryan, A.E., Stout, J.R., Hoffman, J.R., Wilborn, C.D., Sale, C., Kreider, R.B., Jäger, R., Earnest, C.P., Bannock, L. and Campbell, B.I. (2015) ‘International Society of Sports Nutrition Position Stand: Beta-Alanine’, Journal of the International Society of Sports Nutrition, 12(30), pp. 1–14.

Trexler, E.T., Keith, D.S. and Smith-Ryan, A.E. (2019) ‘Citrulline supplementation and exercise performance: A systematic review and meta-analysis’, Journal of Strength and Conditioning Research, 33(12), pp. 3574–3586.