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 hemoglobin

What this outcome means

Hemoglobin is the iron-rich protein in your red blood cells that carries oxygen from your lungs to the rest of your body. On DoseRank it maps to a defined health outcome built from human studies on blood hemoglobin concentration, hematocrit, and red cell oxygen-carrying capacity – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Running lowBlood work showing hemoglobin under the normal range for your age.

Tired and paleFatigue, breathlessness, or washed-out skin that points to low counts.

Heavy-loss monthsHeavy periods or recent blood loss that draw hemoglobin down.

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

Evidence level

96Strong

Ferrous Sulfate – 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

Ferrous Sulfate 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: Ferrous Sulfate 65 mg vs 65-200 mg.

Processed

2.8k

Available

2.8k

Ingredients

Brands

390

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.

Increase hemoglobin

What this outcome means

Who it's for

Running lowBlood work showing hemoglobin under the normal range for your age.

Tired and paleFatigue, breathlessness, or washed-out skin that points to low counts.

Heavy-loss monthsHeavy periods or recent blood loss that draw hemoglobin down.

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

Evidence level

96Strong

Best ingredients

Ferrous Sulfate 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: Ferrous Sulfate 65 mg vs 65-200 mg.

Processed

2.8k

Available

2.8k

Ingredients

Brands

390

Coverage

100%

Relevant ingredients

Which ingredient types matter for hemoglobinOpen to see which ingredient types matter for hemoglobin

2.3k products across 1 ingredient types — open to filter the ranking.

Use types to filter ranked products

Minerals & Trace Elements

2.3k products

Inorganic nutrients from calcium to zinc. The chemical form drives absorption – chelates and citrates usually beat cheap oxides.

Typical: , , , ...

Top decision cards

Best products for hemoglobin

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for hemoglobin

21st Century, Iron, 65 mg, 120 Tablets

21st Century$0.04 / serving4.7 · 24,859Available now

Also helps with

Anemia status

Ferritin

Iron status

Why this ranks here

Evidence fitFerrous Sulfate is the strongest evidence signal for this outcome.
Dose fitFerrous Sulfate at 65 mg lands inside the studied 65-200 mg window.
Price / serving$0.04 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

65 mgIn rangeinside the studied 65-200 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

California Gold Nutrition, Ferrochel® Iron (Bisglycinate), 36 mg, 90 Veggie Capsules

California Gold NutritionClinical89Dose fit71Popularity99$0.08/ serving

Doctor's Best, High Absorption Iron, 27 mg, 120 Tablets

Doctor's BestClinical89Dose fit69Popularity98$0.07/ serving

NOW Foods, Iron, 36 mg, 90 Veg Capsules

NOW FoodsClinical89Dose fit71Popularity99$0.10/ serving

Solgar, Chelated Iron, 100 Tablets (25 mg per Tablet)

SolgarClinical89Dose fit69Popularity96$0.08/ serving

Solgar, Gentle Iron®, 25 mg, 180 Vegetable Capsules

SolgarClinical89Dose fit69Popularity98$0.08/ serving

NOW Foods, Iron, 18 mg, 120 Veg Capsules

NOW FoodsClinical89Dose fit67Popularity99$0.07/ serving

NOW Foods, Iron Complex Caps, 100 Veg Capsules

NOW FoodsClinical89Dose fit69Popularity91$0.09/ serving

Source Naturals, Advanced Ferrochel™, 180 Tablets

Source NaturalsClinical89Dose fit69Popularity84$0.06/ serving

Nature's Bounty, Gentle Iron®, 90 Capsules

Nature's BountyClinical89Dose fit70Popularity84$0.09/ serving