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 night vision

What this outcome means

Night vision is how well your eyes work in dim settings and how quickly they adjust when the lights go down. On DoseRank it maps to a defined health outcome built from human studies on dark adaptation time, low-light visual acuity, and rod sensitivity thresholds – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Night driversPeople who struggle with glare and dim roads after dark.

Slow to adjustThose whose eyes take a long time to settle in low light.

Aging eyesOlder adults finding dim-light vision harder than it once was.

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

Evidence level

92Strong

Retinyl Palmitate – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 90 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

Retinyl Palmitate is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Retinyl Palmitate 1500 mcg (calculated) vs 700-1500 mcg.

Processed

1.7k

Available

1.7k

Ingredients

Brands

238

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 →

Not sure which is right for you?

Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.

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.

Improve night vision

What this outcome means

Who it's for

Night driversPeople who struggle with glare and dim roads after dark.

Slow to adjustThose whose eyes take a long time to settle in low light.

Aging eyesOlder adults finding dim-light vision harder than it once was.

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

Evidence level

92Strong

Best ingredients

Retinyl Palmitate is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Retinyl Palmitate 1500 mcg (calculated) vs 700-1500 mcg.

Processed

1.7k

Available

1.7k

Ingredients

Brands

238

Coverage

100%

Relevant ingredients

Which ingredient types matter for night vision or dark adaptationOpen to see which ingredient types matter for night vision or dark adaptation

1.5k products across 2 ingredient types — open to filter the ranking.

Use types to filter ranked products

Vitamins

1.4k 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: , , , ...

Antioxidants & Bioactive Compounds

49 products

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

Typical:

Top decision cards

Best products for night vision or dark adaptation

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for night vision or dark adaptation

NOW Foods, Vitamin A, 3,000 mcg (10,000 IU), 100 Softgels

NOW Foods$0.05 / serving4.8 · 51,585Available now

Also helps with

Vitamin A status

Immune function

Why this ranks here

Evidence fitRetinyl Palmitate is the strongest evidence signal for this outcome.
Dose fitRetinyl Palmitate at 1500 mcg (calculated) lands inside the studied 700-1500 mcg window.
Price / serving$0.05 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

1500 mcg (calculated)In rangeinside the studied 700-1500 mcg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

NOW Foods, Vitamin A, 7,500 mcg (25,000 IU), 250 Softgels

NOW FoodsClinical89Dose fit94Popularity91$0.06/ serving

Solgar, Dry Vitamin A, 100 Tablets

SolgarClinical89Dose fit90Popularity91$0.07/ serving

NOW Foods, Vitamin A&D, 100 Softgels

NOW FoodsClinical89Dose fit93Popularity91$0.05/ serving

Bluebonnet Nutrition, Vitamin A, 3,000 mcg (10,000 IU), 100 Softgels

Bluebonnet NutritionClinical89Dose fit90Popularity91$0.08/ serving

Natural Factors, Vitamin A, 3,000 mcg (10,000 IU), 180 Softgels

Natural FactorsClinical89Dose fit93Popularity80$0.03/ serving

21st Century, Vitamin A, 3,000 mcg (10,000 IU), 110 Softgels

21st CenturyClinical89Dose fit93Popularity84$0.05/ serving

Swanson Vitamins, Vitamin A, 10,000 IU (3,000 mcg RAE), 250 Softgels

Swanson VitaminsClinical89Dose fit90Popularity80$0.04/ serving

21st Century, One Daily, Women's, 100 Tablets

21st CenturyClinical88Dose fit67Popularity99$0.07/ serving

Carlson, Vitamin A, 3,000 mcg RAE (10,000 IU), 250 Soft Gels

CarlsonClinical89Dose fit90Popularity68$0.05/ serving