Is a higher dose always better?

No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.

What does the Value score mean?

The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.

Why is the cheapest product not #1?

Cost is only one input. The cheapest pick here is a citrate form with weaker absorption and a stock-risk flag, so it leads on Value-for-cost but trails on the composite that also weighs evidence, dose fit and availability.

Are these affiliate links?

Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.

Is this medical advice?

No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.

Reduce perceived exertion

What this outcome means

Perceived exertion is how hard physical effort feels to you in the moment — the sense of strain, breathlessness, and fatigue during activity. On DoseRank it maps to a defined health outcome built from human studies on Borg RPE ratings, effort scores at fixed workloads, and time-to-exhaustion – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Gassed earlyEveryday effort that feels far harder than it should.

Endurance athletesPeople chasing the same pace at a lower sense of strain.

Easing back inThose rebuilding fitness where workouts still feel punishing.

Stack buildersAlready taking supplements such as Caffeine Anhydrous and want the dose right.

Evidence level

92Strong

Caffeine Anhydrous – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 67 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best ingredients

Caffeine Anhydrous is the best supported ingredient signal for this outcome.

Dose partly matchedDoseFit 67

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Caffeine Anhydrous 160 mg vs 150-600 mg.

Processed

270

Available

270

Ingredients

Brands

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

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Get a personal report

A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.

Questions

Frequently asked

Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Reduce perceived exertion

What this outcome means

Who it's for

Gassed earlyEveryday effort that feels far harder than it should.

Endurance athletesPeople chasing the same pace at a lower sense of strain.

Easing back inThose rebuilding fitness where workouts still feel punishing.

Stack buildersAlready taking supplements such as Caffeine Anhydrous and want the dose right.

Evidence level

92Strong

Best ingredients

Caffeine Anhydrous is the best supported ingredient signal for this outcome.

Dose partly matchedDoseFit 67

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Caffeine Anhydrous 160 mg vs 150-600 mg.

Processed

270

Available

270

Ingredients

Brands

Coverage

100%

Relevant ingredients

Which ingredient types matter for perceived exertionOpen to see which ingredient types matter for perceived exertion

229 products across 1 ingredient types — open to filter the ranking.

Use types to filter ranked products

Alkaloids & Stimulants

229 products

Plant-derived nitrogen compounds like caffeine that stimulate the nervous system. Effective but dose-sensitive, with real tolerance and dependence risk.

Typical:

Top decision cards

Best products for perceived exertion

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for perceived exertion

Applied Nutrition, Green Tea Fat Burner®, 90 Fast-Acting Liquid Soft-Gels

Applied Nutrition$0.36 / serving4.2 · 6,967Available now

Also helps with

Alertness

Reaction time

Fatigue

Why this ranks here

Evidence fitCaffeine Anhydrous is the strongest evidence signal for this outcome.
Dose fitCaffeine Anhydrous at 160 mg lands inside the studied 150-600 mg window.
Price / serving$0.36 per serving — mid price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustSolid trust signals from buyer ratings, with room to grow.

The numbers

160 mgIn rangeinside the studied 150-600 mg window

100 mg

200 mg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

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Hydroxycut, Weight Loss Original, 72 Rapid-Release Capsules

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Force Factor, Test X180 Boost®, 120 Tablets

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Nutricost, Guarana, 150 Capsules (500 mg per Capsule)

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MuscleTech, Hydroxycut® Hardcore Elite, 100 Capsules

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Nutricost, Caffeine, 200 mg, 120 Capsules

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EVLution Nutrition, ENGN Shred, Pre-Workout Engine Shred, Cherry Limeade, 8.8 oz (249 g)

EVLution NutritionClinical89Dose fit72Popularity68$0.54/ serving

Nutrex Research, LIPO-6, Hardcore, Maximum Strength, 60 Capsules

Nutrex ResearchClinical89Dose fit74Popularity50$0.45/ serving