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.

Improve erectile function

What this outcome means

Erectile function is your ability to get and keep an erection firm enough for satisfying sex. On DoseRank it maps to a defined health outcome built from human studies on IIEF questionnaire scores, erection hardness ratings, and penile blood flow – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Age-related declineFirmness that has softened gradually with each passing decade.

Performance worryStress or anxiety in the moment that derails arousal.

Circulation-linkedMen with blood-pressure or vascular issues affecting blood flow.

Stack buildersAlready taking supplements such as L-Citrulline and want the dose right.

Evidence level

78Moderate-strong

L-Citrulline – 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 77 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

L-Citrulline is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 77

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: L-Citrulline 3 g vs 1.5-5 g.

Processed

1.6k

Available

1.6k

Ingredients

Brands

225

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.

Improve erectile function

What this outcome means

Who it's for

Age-related declineFirmness that has softened gradually with each passing decade.

Performance worryStress or anxiety in the moment that derails arousal.

Circulation-linkedMen with blood-pressure or vascular issues affecting blood flow.

Stack buildersAlready taking supplements such as L-Citrulline and want the dose right.

Evidence level

78Moderate-strong

Best available ingredients

L-Citrulline is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 77

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: L-Citrulline 3 g vs 1.5-5 g.

Processed

1.6k

Available

1.6k

Ingredients

Brands

225

Coverage

100%

Relevant ingredients

Which ingredient types matter for erectile functionOpen to see which ingredient types matter for erectile function

941 products across 2 ingredient types — open to filter the ranking.

Use types to filter ranked products

Amino Acids & Derivatives

658 products

The building blocks of protein, taken singly for targeted effects – leucine for muscle, theanine for calm. Free-form versions absorb fast on an empty stomach.

Typical: ,

Botanicals/Herbal Extracts

283 products

Concentrated plant and herbal extracts standardized to actives. Potency depends on the extract ratio and marker content, not raw weight.

Typical:

Top decision cards

Best products for erectile function

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for erectile function

Nutricost, L-Citrulline, Unflavored , 1.3 lb (600 g)

Nutricost$0.13 / serving4.8 · 1,330Available now

Also helps with

Nitric oxide bioavailability

Endothelial function

Blood pressure

Why this ranks here

Evidence fitL-Citrulline has moderate human evidence for this outcome.
Dose fitL-Citrulline at 3 g lands inside the studied 1.5-5 g window.
Price / serving$0.13 per serving — low 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

3 gIn rangeinside the studied 1.5-5 g window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

EVLution Nutrition, L-Citrulline 2000, Unflavored, 7.5 oz (200 g)

EVLution NutritionClinical87Dose fit70Popularity96$0.14/ serving

Doctor's Best, L-Citrulline Powder, 7 oz (200 g)

Doctor's BestClinical88Dose fit77Popularity96$0.30/ serving

NOW Foods, Panax Ginseng, 500 mg, 250 Veg Capsules

NOW FoodsClinical86Dose fit68Popularity89$0.20/ serving

Nutricost, L- Citrulline, 180 Capsules (750 mg per Capsule)

NutricostClinical86Dose fit67Popularity91$0.18/ serving

NOW Foods, L-Citrulline, 750 mg, 180 Veg Capsules

NOW FoodsClinical86Dose fit67Popularity96$0.32/ serving

Primaforce, L-Citrulline, 240 Tablets (1,250 mg per Tablet)

PrimaforceClinical87Dose fit73Popularity84$0.25/ serving

Nutricost, L-Citrulline, 120 Tablets (1,250 mg per Tablet)

NutricostClinical87Dose fit73Popularity91$0.30/ serving

EVLution Nutrition, L-Citrulline2000®, 90 Veggie Capsules (666 mg per Capsule)

EVLution NutritionClinical87Dose fit70Popularity80$0.30/ serving

NOW Foods, Sports, Arginine & Citrulline Powder, 12 oz (340 g)

NOW FoodsClinical86Dose fit67Popularity80$0.21/ serving