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.

Relieve constipation

What this outcome means

Constipation is when bowel movements turn infrequent, hard, or difficult to pass, often leaving you bloated or incompletely emptied. On DoseRank it maps to a defined health outcome built from human studies on bowel movement frequency, stool consistency scores, and straining and transit time – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Sluggish digestionGoing days between movements that feel hard and incomplete.

Low-fiber, low-movementDiets and sedentary routines that slow the gut down.

Routine-disruptedTravel, schedule shifts, or stress that throw off regularity.

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

Evidence level

92Strong

Magnesium Citrate – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 72 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

Magnesium Citrate is the best supported ingredient signal for this outcome.

Dose partly matchedDoseFit 72

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Magnesium Citrate 450 mg vs 300-1000 mg.

Processed

7.8k

Available

7.8k

Ingredients

Brands

569

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.

Relieve constipation

What this outcome means

Who it's for

Sluggish digestionGoing days between movements that feel hard and incomplete.

Low-fiber, low-movementDiets and sedentary routines that slow the gut down.

Routine-disruptedTravel, schedule shifts, or stress that throw off regularity.

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

Evidence level

92Strong

Best ingredients

Magnesium Citrate is the best supported ingredient signal for this outcome.

Dose partly matchedDoseFit 72

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Magnesium Citrate 450 mg vs 300-1000 mg.

Processed

7.8k

Available

7.8k

Ingredients

Brands

569

Coverage

100%

Relevant ingredients

Which ingredient types matter for constipationOpen to see which ingredient types matter for constipation

6k products across 5 ingredient types — open to filter the ranking.

Use types to filter ranked products

Minerals & Trace Elements

5.2k products

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

Typical: , , , ...

Fibers & Prebiotics

532 products

Indigestible carbs that feed gut bacteria and add bulk. Start low and ramp slowly – too much too fast means bloating and gas.

Typical: , , , ...

Adsorbents & Inert Functional Materials

53 products

Binding agents like charcoal and silica that adsorb or stabilize. Functional and non-nutritive – they can bind nutrients, so time them apart.

Typical: ,

Botanicals/Herbal Extracts

153 products

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

Typical: ,

Fatty Acids & Lipids

99 products

Dietary fats including omega-3s and structural lipids. Look at the active EPA/DHA amounts and freshness, since oils oxidize and turn rancid.

Typical:

Top decision cards

Best products for constipation

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for constipation

NOW Foods, Magnesium Citrate Pure Powder, 8 oz (227 g)

NOW Foods$0.15 / serving4.6 · 9,812Available now

Also helps with

Magnesium status

Bowel regularity

Blood pressure

Why this ranks here

Evidence fitMagnesium Citrate is the strongest evidence signal for this outcome.
Dose fitMagnesium Citrate at 450 mg lands inside the studied 300-1000 mg window.
Price / serving$0.15 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

450 mgIn rangeinside the studied 300-1000 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

NOW Foods, Magnesium Citrate, 200 mg, 250 Tablets

NOW FoodsClinical89Dose fit70Popularity98$0.19/ serving

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

Nature's BountyClinical88Dose fit71Popularity80$0.06/ serving

Solgar, Magnesium Citrate, 120 Tablets (200 mg per Tablet)

SolgarClinical89Dose fit70Popularity98$0.21/ serving

California Gold Nutrition, Magnesium Powder Beverage, Unflavored, 10 oz (283 g)

California Gold NutritionClinical88Dose fit68Popularity89$0.15/ serving

Natural Factors, Magnesium Citrate, 360 Capsules (150 mg per Capsule)

Natural FactorsClinical89Dose fit72Popularity89$0.22/ serving

NOW Foods, Magnesium Citrate, 240 Veg Capsules (133 mg per Capsule)

NOW FoodsClinical89Dose fit70Popularity99$0.28/ serving

Solgar, Magnesium With Vitamin B6, 250 Tablets

SolgarClinical87Dose fit67Popularity96$0.16/ serving

Best Naturals, Magnesium Citrate, 250 Tablets (200 mg per Tablet)

Best NaturalsClinical89Dose fit70Popularity76$0.12/ serving

Solaray, Magnesium Citrate, 180 VegCaps (133 mg per Capsule)

SolarayClinical89Dose fit70Popularity96$0.31/ serving