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.

Slow cataract progression

What this outcome means

Cataract progression is the gradual clouding of the eye's lens over years, slowly fogging and dimming what you see. On DoseRank it maps to a defined health outcome built from human studies on lens opacity grading, visual acuity changes, and rate of clouding – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Aging eyesOlder adults noticing colors dull and vision slowly hazing over.

Early lens changesPeople with first signs of clouding caught at an eye exam.

High sun exposureThose with years of bright outdoor light and little eye protection.

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

Evidence level

78Moderate-strong

Zeaxanthin – 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 78 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

Zeaxanthin is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 78

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Zeaxanthin 4 mg vs 2-6 mg.

Processed

2.5k

Available

2.5k

Ingredients

Brands

294

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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Take 60-sec quiz

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.

Slow cataract progression

What this outcome means

Who it's for

Aging eyesOlder adults noticing colors dull and vision slowly hazing over.

Early lens changesPeople with first signs of clouding caught at an eye exam.

High sun exposureThose with years of bright outdoor light and little eye protection.

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

Evidence level

78Moderate-strong

Best available ingredients

Zeaxanthin is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 78

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Zeaxanthin 4 mg vs 2-6 mg.

Processed

2.5k

Available

2.5k

Ingredients

Brands

294

Coverage

100%

Relevant ingredients

Which ingredient types matter for cataract progressionOpen to see which ingredient types matter for cataract progression

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

Use types to filter ranked products

Antioxidants & Bioactive Compounds

275 products

Molecules that neutralize free radicals and tune cell signaling. Helpful in balance; mega-doses can blunt the body's own adaptive defenses.

Typical:

Vitamins

1 product

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 cataract progression

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for cataract progression

Nutricost, Zeaxanthin with Lutein, 120 Softgels

Nutricost$0.11 / serving4.8 · 6,108Available now

Also helps with

Macular pigment optical density

Contrast sensitivity

Visual acuity

Why this ranks here

Evidence fitZeaxanthin has moderate human evidence for this outcome.
Dose fitZeaxanthin at 4 mg lands inside the studied 2-6 mg window.
Price / serving$0.11 per serving — low price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustStrong trust signals — consistently high marks from verified buyer ratings.

The numbers

4 mgIn rangeinside the studied 2-6 mg window

20 mg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Doctor's Best, Lutein, Lutemax 2020, 20 mg, 180 Softgels

Doctor's BestClinical83Dose fit78Popularity99$0.16/ serving

Vitamatic, Lutein & Zeaxanthin, 240 Softgels

VitamaticClinical84Dose fit92Popularity91$0.15/ serving

NOW Foods, Lutein & Zeaxanthin , 120 Softgels

NOW FoodsClinical84Dose fit84Popularity96$0.24/ serving

Sports Research, Lutein + Zeaxanthin, Plant-Based, 120 Veggie Softgels

Sports ResearchClinical83Dose fit78Popularity96$0.18/ serving

Natural Factors, Lutein, 60 Softgels

Natural FactorsClinical84Dose fit90Popularity89$0.35/ serving

Doctor's Best, Lutein, Lutemax 2020, 60 Softgels

Doctor's BestClinical83Dose fit78Popularity98$0.22/ serving

Natural Factors, Lutein With Zeaxanthin, 120 Softgels

Natural FactorsClinical83Dose fit75Popularity89$0.17/ serving

Jarrow Formulas, Lutein, 20 mg, 120 Softgels

Jarrow FormulasClinical83Dose fit78Popularity84$0.23/ serving

California Gold Nutrition, Lutein and Zeaxanthin Gummies, Tropical Fruit, 90 Vegetarian Gummies

California Gold NutritionClinical83Dose fit78Popularity91$0.31/ serving