May 25, 2026
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Created by Ryan Hale

Evidence-Based Supplements: The 6 That Work and How to Judge the Rest

Evidence based supplements guide about research recovery and performance
SUPPLEMENTS · THE FRAMEWORK

Evidence-Based Supplements: The 6 That Work and How to Judge the Rest

Of the thousands of sports supplements on sale, six have strong, replicated evidence for performance in healthy trained adults: creatine monohydrate, caffeine, protein, beta-alanine, sodium bicarbonate and dietary nitrate. A second group works in specific situations, and everything else runs on marketing. This guide gives you the tiered list, the doses the research used, and the four-question framework MuscleScience applies to every product review on this site so you can rank any new supplement yourself.

Independent editorial guide. MuscleScience has no commercial relationship with any supplement manufacturer and does not sell products.

R
Ryan Hale
Research Notes Editor · Updated September 2026
THE DATA IN BRIEF

Evidence-Based Supplements: 3 Things the Literature Agrees On

The two most authoritative reviews of sports supplements, the IOC consensus statement (Maughan 2018) and the ISSN exercise and sports nutrition review (Kerksick 2018), were written by different groups with different methods and reached nearly the same short list. That agreement is the starting point for every list of evidence-based supplements, including the one below.

6 supplements, strong evidence

Creatine, caffeine, protein, beta-alanine, sodium bicarbonate and nitrate appear on both lists. Each has multiple independent randomized trials, a known effective dose and a plausible mechanism.

Effects are small

Even the best evidence-based supplements add a few percent to performance. Creatine adds roughly 5 to 10 percent to strength gains over a training block; caffeine improves endurance by about 2 to 4 percent. A supplement that promises 30 percent is promising something no trial has found.

Dose decides everything

Most products built around evidence-based supplements under-dose the ingredient. Beta-alanine works at 3.2 to 6.4 g per day; most pre-workouts carry 1.6 to 2 g. The ingredient is evidence-based; the product is not.

ARTICLE SCOPE

What This Evidence-Based Supplements Guide Covers

This evidence-based supplements page is the reference behind every product review on MuscleScience. When a review says an ingredient is "at threshold" or "under-dosed", the threshold comes from the tier table below and the studies listed at the end. It is written for healthy adults who train; clinical uses of supplements are outside its scope.

Covered

A tiered table of the supplements people actually buy, with the effective dose and the evidence grade for each.

What "evidence-based" means in practice: the four questions that separate a replicated finding from a press release.

Red flags that mark weak evidence dressed as strong, from proprietary blends to rodent studies.

How to apply the framework to a product in the shop in under a minute.

Not covered

Medical supplementation. Vitamin D, iron and B12 for diagnosed deficiency are clinical decisions made with bloodwork, not sports supplements.

Anabolic drugs and peptides. Covered in their own sections of the site; they are not supplements and are not judged by this framework.

Brand recommendations. The framework judges ingredients and doses; brands are compared in individual reviews.

THE TIER TABLE

Evidence-Based Supplements Ranked: What Works, What Might, What Does Not

Tier reflects the independent peer-reviewed literature on evidence-based supplements for the primary marketed claim in healthy trained adults, not manufacturer studies and not mechanism alone. Doses are the amounts used in the trials that produced the effect.

● Tier 1 = strong: replicated RCTs, known dose, consensus support   ● Tier 2 = moderate: works in specific contexts or the evidence is mixed   ● Tier 3 = weak: no consistent human benefit at any tested dose   ● Situational = only if deficient or in a narrow use case
SupplementEvidence-based doseWhat it does (and does not do)Tier
Creatine monohydrate3 to 5 g per day (optional 20 g per day for 5 to 7 days)Increases strength, power and lean mass gains from training. Most studied supplement in the field. See our creatine HCL vs monohydrate analysis.● Tier 1
Caffeine3 to 6 mg per kg, 30 to 60 min before exerciseImproves endurance, strength and perceived effort. Dose above 6 mg per kg adds side effects, not performance.● Tier 1
Protein (whey, milk, soy, blends)1.6 to 2.2 g per kg per day, 0.4 g per kg per mealSupports muscle gain when daily intake is otherwise short. Adds nothing above 2.2 g per kg. See protein drinks for muscle gain.● Tier 1
Beta-alanine3.2 to 6.4 g per day for 4 or more weeksSmall improvement in efforts lasting 1 to 4 minutes. Acute doses do nothing; tingling is not the effect.● Tier 1
Sodium bicarbonate0.2 to 0.3 g per kg, 60 to 180 min beforeBuffers acidity in high-intensity efforts of 30 s to 12 min. Gastrointestinal side effects are the limiting factor.● Tier 1
Dietary nitrate (beetroot)6 to 12 mmol nitrate, 2 to 3 h beforeSmall endurance benefit, larger in less-trained people; minimal in elite endurance athletes.● Tier 1
L-citrulline3 to 6 g (or 8 g citrulline malate)Modest increase in reps to failure and reduced soreness in some trials; results mixed. Most pre-workouts under-dose it.● Tier 2
HMB3 g per dayPossible benefit in untrained or older people or during energy deficit; minimal in trained lifters. See creatine and HMB.● Tier 2
Omega-3 (EPA/DHA)2 to 3 g per daySome evidence for recovery and muscle protein synthesis in older adults; performance data weak. Reasonable for general health.● Tier 2
Vitamin DTo correct a measured deficiencyCorrects deficiency, which can improve strength; no benefit when levels are adequate.● Situational
Electrolytes / sodiumPer sweat lossUseful in long sessions in heat; irrelevant for a 60-minute lift.● Situational
BCAAsAnyNo added muscle gain when daily protein is adequate; leucine alone cannot build muscle without the other essential amino acids.● Tier 3
GlutamineAnyNo effect on muscle gain or strength in healthy adults; clinical uses only.● Tier 3
"Testosterone boosters" (tribulus, fenugreek, D-aspartic acid)AnyNo meaningful rise in testosterone or performance in healthy men in controlled trials.● Tier 3
Fat burners (stimulant blends)AnyThe measurable effect is the caffeine. The rest adds cost and cardiovascular load.● Tier 3
Collagen for muscleAnyLow in leucine, no tryptophan; does not stimulate muscle protein synthesis. Separate evidence for connective tissue is emerging.● Tier 3 for muscle

How to read this table: a Tier 1 ingredient inside an under-dosed product is still an under-dosed product. Before buying anything, find the ingredient here, note the dose, then check the label. Our guide to reading supplement labels shows where manufacturers hide the shortfall.

THE FRAMEWORK

What "Evidence-Based" Means: 4 Questions We Ask of Every Supplement

A supplement earns a place among evidence-based supplements when the answer to all four of these questions is yes. Most products fail at question two or three, and the failure is usually visible on the label once you know where to look.

1

Has the effect been shown in humans, in randomized controlled trials, more than once?

The hierarchy runs from meta-analyses of randomized trials at the top, through single randomized trials, to observational studies, then animal and cell work, then mechanism and anecdote at the bottom. A rodent study or a "clinically studied ingredient" claim built on a single manufacturer-funded trial does not clear this bar. Creatine clears it with hundreds of trials; most botanical "performance" extracts never get past one.

2

Is the dose in the product the dose in the trials?

This is where most products fall. The trials that support beta-alanine used 3.2 to 6.4 g per day; the trials for L-citrulline used 3 g or more; for creatine 3 to 5 g. A pre-workout with 2 g of beta-alanine, 1.2 g of citrulline and 1 g of creatine nitrate contains three evidence-based ingredients and delivers none of them at an evidence-based dose. Proprietary blends exist to hide exactly this arithmetic.

3

Was the effect measured in people like you, on an outcome you care about?

A supplement that helps untrained older adults may do nothing for a trained 25-year-old; HMB is the textbook case. A supplement that raises a blood marker is not the same as one that raises a lift; "testosterone boosters" that nudge a hormone within the normal range have never been shown to add muscle. Check the population and the outcome, not only the direction of the result.

4

Is the effect large enough to matter, and is it safe at that dose?

Real effects from evidence-based supplements are small: a few percent on a lift or a time trial, which is meaningful for a competitor and modest for everyone else. Anything advertised as transformative should be treated as a claim about marketing, not physiology. Safety is the other half: sodium bicarbonate works but causes gastrointestinal distress in many users, and high-stimulant products carry a cardiovascular load that the performance gain does not justify for most people.

DOSE DATA

Evidence-Based Ingredients, Under-Dosed Products: A Real Example

The chart shows the gap between question one and question two using a product we have checked against its own label. Every ingredient plotted is Tier 1 or Tier 2; only one of the four is dosed near the level the research used. The animated bars underneath show the overall shape of the evidence: how the sixteen supplements in the tier table split by grade.

Evidence-based supplements: label dose of a best-selling pre-workout as a percentage of the research dose, caffeine 89 percent, beta-alanine 63 percent, citrulline 40 percent, creatine 23 percent

A different view: how the 16 supplements in the tier table above divide by evidence grade.

Tier 1, strong evidence6 of 16 (38 percent)
Tier 2, moderate or context-dependent3 of 16 (19 percent)
Situational, only if deficient or in a narrow use2 of 16 (12 percent)
Tier 3, no consistent benefit5 of 16 (31 percent)

The evidence-based supplements table is weighted toward popular products, and even so fewer than half of them have strong evidence. Across the full supplement market the share is far lower; the IOC consensus lists only a handful of performance supplements with adequate support.

RED FLAGS

7 Signs of Weak Evidence Dressed as Strong

These are the patterns that show up again and again in products sold as evidence-based supplements that fail the framework. Any one of them is a reason to read more carefully; three or more together is a reason to walk away.

  • A proprietary blend. Ingredients listed with a single combined weight and no individual doses. The only reason to hide doses is that they are too small to defend.
  • "Clinically studied" without a citation. If the study existed and supported the claim, the brand would link it. Ask for the PubMed ID.
  • Rodent, cell or in vitro evidence presented as human results. Most compounds that work in a dish never work in a person at a tolerable dose.
  • Mechanism as proof. "Increases nitric oxide" or "supports testosterone" describes a pathway, not an outcome. The question is whether anyone lifted more.
  • A single manufacturer-funded trial. Industry funding does not make a result wrong, but a result that has never been replicated by an independent group is a hypothesis, not evidence.
  • Effect sizes that no supplement has ever produced. Real ergogenic effects are a few percent. Claims of 20 to 50 percent improvements have no precedent in the literature.
  • Athlete endorsements in place of data. A sponsored physique is evidence of a contract, not of the product.
IN PRACTICE

How to Use the Evidence-Based Supplements Framework in the Shop

The evidence-based supplements framework takes under a minute per product once the tier table is familiar. Here is the order of operations, and the outcome you should expect for the two most common situations.

Buy when

Every active ingredient is Tier 1 or Tier 2 and each is listed with its own dose.

Each dose is at or above the trial dose in the table, for your body weight.

The claim matches the evidence: creatine for strength, caffeine for a session, beta-alanine for 1 to 4 minute efforts.

The price reflects the ingredient, not the packaging. Single-ingredient creatine and caffeine cost cents per dose.

Walk away when

Doses are hidden in a blend or the label lists an ingredient at a fraction of the research dose.

The headline ingredient is Tier 3 (BCAAs, glutamine, tribulus, most fat-burner botanicals). Traditional resins sit here too: our shilajit resin guide shows that every controlled trial used a purified extract, not the resin itself.

The evidence cited is a mechanism, a rodent study or a testimonial.

You already meet the need from food: protein above 2.2 g per kg, or caffeine from coffee, adds nothing further.

What most lifters actually need: creatine monohydrate at 3 to 5 g per day, enough protein to reach 1.6 to 2.2 g per kg, and caffeine before hard sessions if it agrees with you. That is the entire Tier 1 stack for strength training. Beta-alanine, bicarbonate and nitrate matter for repeated high-intensity or endurance work and can be added when the goal calls for them.

COMMON MISTAKES

4 Mistakes People Make With Evidence-Based Supplements

  • Treating the ingredient as the evidence. Creatine is evidence-based; a pre-workout with 1 g of creatine nitrate is not. The tier applies to the dose, not to the word on the label.
  • Stacking Tier 2 and Tier 3 before Tier 1 is covered. Buying citrulline, HMB and a fat burner while eating 1.2 g per kg of protein and skipping creatine gets the order backwards. The basics carry nearly all of the available benefit.
  • Expecting supplement-sized effects from a supplement. A few percent is the honest range. Training, sleep and total nutrition move the needle by far more; supplements polish an already sound program.
  • Extrapolating from a different population. Results in older adults, clinical patients or untrained beginners often vanish in trained lifters. Check who was in the study before applying it to yourself.
FREQUENTLY ASKED

Evidence-Based Supplements: Common Questions Answered

Which supplements are actually evidence-based for building muscle?

Creatine monohydrate (3 to 5 g per day) and adequate protein (1.6 to 2.2 g per kg per day) have the strongest evidence for muscle and strength gains. Caffeine improves training performance acutely. Beta-alanine, sodium bicarbonate and dietary nitrate have strong evidence for specific performance outcomes rather than muscle gain directly.

What is the best evidence-based supplement stack for beginners?

The evidence-based supplements stack is short: protein to reach your daily target, creatine monohydrate at 3 to 5 g per day, and caffeine before hard sessions if you tolerate it. Nothing else is needed until training, sleep and total nutrition are consistent; adding more products before then spends money on effects too small to notice.

Are pre-workouts evidence-based?

The caffeine in them is. Most other ingredients in pre-workouts are evidence-based compounds at doses below the amounts used in research, which is why our reviews of products such as C4 and Mother Bucker check every ingredient against its trial dose. A pre-workout with fully dosed caffeine, beta-alanine and citrulline exists, but it is the exception.

Are BCAAs evidence-based?

Not for muscle gain in people who eat enough protein. Branched-chain amino acids supply only three of the nine essential amino acids, so they cannot build muscle protein on their own, and trials in adults with adequate protein intake show no added benefit over protein alone.

How do I tell whether a supplement study is reliable?

Look for a randomized, placebo-controlled design in humans, a population similar to you, an outcome that matters (strength, time to exhaustion, lean mass), a dose you can match, and at least one independent replication. Meta-analyses and position stands from bodies such as the ISSN and IOC summarize this work and are the fastest reliable check.

Do evidence-based supplements have side effects?

At research doses evidence-based supplements are generally well tolerated in healthy adults, with predictable exceptions: caffeine disturbs sleep and raises heart rate, beta-alanine causes harmless tingling, sodium bicarbonate causes gastrointestinal upset in many users, and creatine raises serum creatinine, which can confuse kidney blood tests. People with medical conditions should check with a clinician first.

REFERENCES

Sources & Further Reading

The tier assignments above follow the consensus documents and position stands listed here; each PMID was verified against the PubMed record before publication.

1
IOC Consensus Statement: Dietary Supplements and the High-Performance Athlete Verified
Maughan RJ et al. Int J Sport Nutr Exerc Metab. 2018. PMID 29589768
View on PubMed →
2
ISSN exercise & sports nutrition review update: research & recommendations Verified
Kerksick CM et al. J Int Soc Sports Nutr. 2018. PMID 30068354
View on PubMed →
3
International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine Verified
Kreider RB et al. J Int Soc Sports Nutr. 2017. PMID 28615996
View on PubMed →
4
International society of sports nutrition position stand: caffeine and exercise performance Verified
Guest NS et al. J Int Soc Sports Nutr. 2021. PMID 33388079
View on PubMed →
5
International Society of Sports Nutrition Position Stand: protein and exercise Verified
Jäger R et al. J Int Soc Sports Nutr. 2017. PMID 28642676
View on PubMed →
6
International society of sports nutrition position stand: Beta-Alanine Verified
Trexler ET et al. J Int Soc Sports Nutr. 2015. PMID 26175657
View on PubMed →
7
International Society of Sports Nutrition position stand: sodium bicarbonate and exercise performance Verified
Grgic J et al. J Int Soc Sports Nutr. 2021. PMID 34503527
View on PubMed →
8
Ergogenic Effect of Nitrate Supplementation: A Systematic Review and Meta-analysis Verified
Senefeld JW et al. Med Sci Sports Exerc. 2020. PMID 32936597
View on PubMed →
KEEP READING

More from the Supplements series

The evidence-based supplements framework applied: category guides and label-checked product reviews that use the tiers on this page.

1How to Read Supplement Labels 2Performance Supplements Guide 3Recovery Supplements 4C4 Pre Workout Ingredients
DISCLAIMER

Final Educational Note

This article is for educational purposes and does not constitute medical advice. Tier assignments summarize the peer-reviewed literature for healthy trained adults as of the date above and will be revised as new trials are published. Effective doses vary with body weight and individual tolerance.

MuscleScience has no commercial relationship with any supplement manufacturer. Individuals with medical conditions, those taking medication, and anyone under 18, pregnant or breastfeeding should consult a licensed clinician before using any supplement. For how we read a label, see how to read supplement labels; for the category overview, see what are supplements.

R
Ryan Hale
Research Notes Editor at MuscleScience. Covers supplements, peptides and evidence-based performance topics, translating clinical research into clear educational context for gym-focused readers. Reviews all supplement content for accuracy against the label and the primary literature before publication.
Writen by
Ryan Hale

Ryan Hale focuses on research notes, mechanisms, supplements, peptides, and evidence breakdowns. His articles translate studies and technical concepts into clear educational context for performance-focused readers.

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