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.

Reduce heartburn

What this outcome means

Gastroesophageal reflux is when stomach acid washes back up into the esophagus, leaving a burning chest or throat sensation often called heartburn. On DoseRank it maps to a defined health outcome built from human studies on reflux episode frequency, symptom severity scores, and acid-exposure measures – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

After-meal burnChest burning that rises after large or rich meals.

Nighttime refluxAcid creeping up when lying down that disrupts sleep.

Frequent heartburnRecurring burning several days a week despite care.

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

Evidence level

92Strong

Calcium Carbonate – 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

Calcium Carbonate 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: Calcium Carbonate 1000 mg vs 500-1000 mg.

Processed

3.5k

Available

3.5k

Ingredients

Brands

332

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.

Reduce heartburn

What this outcome means

Who it's for

After-meal burnChest burning that rises after large or rich meals.

Nighttime refluxAcid creeping up when lying down that disrupts sleep.

Frequent heartburnRecurring burning several days a week despite care.

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

Evidence level

92Strong

Best ingredients

Calcium Carbonate 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: Calcium Carbonate 1000 mg vs 500-1000 mg.

Processed

3.5k

Available

3.5k

Ingredients

Brands

332

Coverage

100%

Relevant ingredients

Which ingredient types matter for gastroesophageal reflux or heartburnOpen to see which ingredient types matter for gastroesophageal reflux or heartburn

2.7k products across 4 ingredient types — open to filter the ranking.

Use types to filter ranked products

Amino Acids & Derivatives

217 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

361 products

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

Typical: , , , ...

Minerals & Trace Elements

1.5k products

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

Typical: ,

Hormones & Hormone-like Compounds

620 products

Compounds that signal like the body's own hormones — melatonin, DHEA, pregnenolone. Powerful at tiny doses and easy to overdo; timing matters more than potency.

Typical:

Top decision cards

Best products for gastroesophageal reflux or heartburn

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for gastroesophageal reflux or heartburn

21st Century, Calcium Plus D3, 90 Tablets

21st Century$0.07 / serving4.7 · 11,015Available now

Also helps with

Bone mineral density

Fracture risk

Calcium status

Why this ranks here

Evidence fitCalcium Carbonate is the strongest evidence signal for this outcome.
Dose fitCalcium Carbonate at 1000 mg lands inside the studied 500-1000 mg window.
Price / serving$0.07 per serving — mid 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

1000 mgIn rangeinside the studied 500-1000 mg window

20 mcg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

21st Century, 600+D3, Calcium & Vitamin D3 Supplement, 400 Tablets

21st CenturyClinical88Dose fit71Popularity84$0.03/ serving

21st Century, Calcium Supplement 600, 400 Tablets (600 mg per Tablet)

21st CenturyClinical88Dose fit71Popularity80$0.03/ serving

NOW Foods, Calcium Carbonate Pure Powder, 12 oz (340 g)

NOW FoodsClinical88Dose fit71Popularity89$0.05/ serving

21st Century, Calcium Magnesium Zinc + D3, 250 Tablets

21st CenturyClinical89Dose fit90Popularity99$0.13/ serving

21st Century, One Daily, Women's 50+, 100 Tablets

21st CenturyClinical88Dose fit67Popularity91$0.09/ serving

21st Century, 600+D3 Plus Minerals, 120 Tablets

21st CenturyClinical88Dose fit71Popularity68$0.04/ serving

21st Century, Calcium 500 + D3, 400 Tablets

21st CenturyClinical88Dose fit67Popularity50$0.03/ serving

Nature's Bounty, Calcium Magnesium Zinc with Vitamin D3, 100 Coated Caplets

Nature's BountyClinical88Dose fit67Popularity99$0.16/ serving

Nature's Bounty, Magnesium, High Potency, 500 mg, 200 Coated Tablets

Nature's BountyClinical86Dose fit73Popularity80$0.06/ serving