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.

Increase VO2 max

What this outcome means

Aerobic capacity is how much oxygen your body can take in and use at peak effort, setting the ceiling on your endurance. On DoseRank it maps to a defined health outcome built from human studies on VO2 max, oxygen uptake, and time-to-exhaustion during exercise – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Endurance athletesRunners and cyclists chasing a higher aerobic ceiling.

Winded easilyOut of breath during efforts that should feel manageable.

Fitness rebuildersRebuilding stamina after a long stretch of inactivity.

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

Evidence level

78Moderate-strong

Ashwagandha – has moderate public evidence for this outcome. This usually means there are smaller or mechanistic studies, but not randomized human trials. A DoseFit Score of 32 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 available ingredients

Ashwagandha is the best supported ingredient signal for this outcome.

Dose mismatchDoseFit 32

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Below range: Ashwagandha 250 mg vs 300-1000 mg.

Processed

1.4k

Available

1.4k

Ingredients

Brands

246

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.

Increase VO2 max

What this outcome means

Who it's for

Endurance athletesRunners and cyclists chasing a higher aerobic ceiling.

Winded easilyOut of breath during efforts that should feel manageable.

Fitness rebuildersRebuilding stamina after a long stretch of inactivity.

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

Evidence level

78Moderate-strong

Best available ingredients

Ashwagandha is the best supported ingredient signal for this outcome.

Dose mismatchDoseFit 32

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Below range: Ashwagandha 250 mg vs 300-1000 mg.

Processed

1.4k

Available

1.4k

Ingredients

Brands

246

Coverage

100%

Relevant ingredients

Which ingredient types matter for aerobic capacity (vo2 max)Open to see which ingredient types matter for aerobic capacity (vo2 max)

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

Use types to filter ranked products

Vitamins

92 products

Essential micronutrients the body can't make in sufficient amounts. Fat-soluble ones (A, D, E, K) store up; water-soluble ones need regular topping-up.

Typical:

Top decision cards

Best products for aerobic capacity (vo2 max)

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for aerobic capacity (vo2 max)

Swanson Vitamins, Ultimate Ashwagandha, 250 mg , 60 Veggie Capsules

Swanson Vitamins$0.21 / serving4.7 · 2,367Available now

Also helps with

Perceived stress

Cortisol

Anxiety symptoms

Why this ranks here

Evidence fitAshwagandha has moderate human evidence for this outcome.
Dose fitAshwagandha at 250 mg sits below the studied 300-1000 mg window.
Price / serving$0.21 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

250 mgBelow rangebelow the studied 300-1000 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

WishGarden Herbs, Ashwagandha, 2 fl oz (59 ml)

WishGarden HerbsClinical72Dose fit40Popularity30$0.67/ serving

Doctor's Best, Ashwagandha, 60 Veggie Caps (125 mg per Capsule)

Doctor's BestClinical66Dose fit32Popularity89$0.39/ serving

Om Mushrooms, Mushroom Powder, 10 Mushroom Complex, Master Blend + Ashwagandha, 6.34 oz (180 g)

Om MushroomsClinical66Dose fit32Popularity68$0.44/ serving

Paradise Herbs, Ashwagandha Extract, 60 Vegetarian Capsules (250 mg per Capsule)

Paradise HerbsClinical66Dose fit32Popularity50$0.27/ serving

Life Extension, Ashwagandha Plus , 60 Vegetarian Capsules

Life ExtensionClinical66Dose fit32Popularity80$0.68/ serving

Organic India, Peaceful Sleep®, 90 Vegetarian Caps

Organic IndiaClinical68Dose fit35Popularity30$0.69/ serving

Paradise Herbs, Ashwagandha, 250 mg, 180 Vegetarian Capsules

Paradise HerbsClinical66Dose fit32Popularity30$0.22/ serving

MRM Nutrition, Relax-All® Sleep, 60 Vegan Capsules

MRM NutritionClinical66Dose fit32Popularity50$0.51/ serving

Swanson Vitamins, Ultimate Performance Formula, Men's Health, 60 Veggie Capsules

Swanson VitaminsClinical66Dose fit32Popularity30$0.24/ serving