How does DoseRank decide what ranks #1?

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.

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 diarrhea

DOSERANKEVIDENCE-BASED SUPPLEMENTS

Best Supplements for Diarrhea — 11055 Ranked by Evidence | DOSERANK

Top decision cards

Best products for diarrhea

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for diarrhea

Paradise Herbs, Earth's Blend, Zinc Picolinate, 30 mg, 90 Vegetarian Capsules

Paradise Herbs$0.12 / serving4.8 · 7,590Available now

Also helps with

Immune function

Zinc status

Acne severity

Why this ranks here

Evidence fitZinc Picolinate and Probiotics are the strongest evidence signals for this outcome.
Dose fitZinc Picolinate at 30 mg is higher than the studied 10-20 mg window.
Price / serving$0.12 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.

Trade-offs

Dose fit is the weak spot on this listPopularity trails the other picks here

The numbers

30 mgAbove rangehigher than the studied 10-20 mg window

25 mg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Solgar, Zinc Picolinate, 22 mg, 100 Tablets

SolgarClinical88Dose fit90Popularity99$0.08/ serving

NOW Foods, Zinc Picolinate, 50 mg, 120 Veg Capsules

NOW FoodsClinical88Dose fit94Popularity99$0.09/ serving

California Gold Nutrition, Zinc Picolinate, 50 mg, 120 Veggie Capsules

California Gold NutritionClinical88Dose fit94Popularity99$0.09/ serving

Swanson Vitamins, Zinc Picolinate, 22 mg, 60 Vegan Capsules

Swanson VitaminsClinical88Dose fit90Popularity99$0.15/ serving

Country Life, Zinc Picolinate, 25 mg, 100 Tablets

Country LifeClinical88Dose fit91Popularity91$0.13/ serving

SMNutrition, Triple Action Clear 3, 120 Capsules

SMNutritionClinical97Dose fit72Popularity50$0.42/ serving

Nutricost, Zinc Picolinate, 30 mg, 240 Capsules

NutricostClinical88Dose fit91Popularity84$0.07/ serving

Nature's Life, Protecting Zinc Plus Copper, 250 Capsules

Nature's LifeClinical88Dose fit91Popularity80$0.09/ serving

Thorne, Zinc Picolinate, 30 mg, 180 Capsules

ThorneClinical88Dose fit91Popularity96$0.20/ serving

Top decision cards

Best products for diarrhea

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for diarrhea

Paradise Herbs, Earth's Blend, Zinc Picolinate, 30 mg, 90 Vegetarian Capsules

Paradise Herbs$0.12 / serving4.8 · 7,590Available now

Also helps with

Immune function

Zinc status

Acne severity

Why this ranks here

Evidence fitZinc Picolinate and Probiotics are the strongest evidence signals for this outcome.
Dose fitZinc Picolinate at 30 mg is higher than the studied 10-20 mg window.
Price / serving$0.12 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.

Trade-offs

Dose fit is the weak spot on this listPopularity trails the other picks here

The numbers

30 mgAbove rangehigher than the studied 10-20 mg window

25 mg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Solgar, Zinc Picolinate, 22 mg, 100 Tablets

SolgarClinical88Dose fit90Popularity99$0.08/ serving

NOW Foods, Zinc Picolinate, 50 mg, 120 Veg Capsules

NOW FoodsClinical88Dose fit94Popularity99$0.09/ serving

California Gold Nutrition, Zinc Picolinate, 50 mg, 120 Veggie Capsules

California Gold NutritionClinical88Dose fit94Popularity99$0.09/ serving

Swanson Vitamins, Zinc Picolinate, 22 mg, 60 Vegan Capsules

Swanson VitaminsClinical88Dose fit90Popularity99$0.15/ serving

Country Life, Zinc Picolinate, 25 mg, 100 Tablets

Country LifeClinical88Dose fit91Popularity91$0.13/ serving

SMNutrition, Triple Action Clear 3, 120 Capsules

SMNutritionClinical97Dose fit72Popularity50$0.42/ serving

Nutricost, Zinc Picolinate, 30 mg, 240 Capsules

NutricostClinical88Dose fit91Popularity84$0.07/ serving

Nature's Life, Protecting Zinc Plus Copper, 250 Capsules

Nature's LifeClinical88Dose fit91Popularity80$0.09/ serving

Thorne, Zinc Picolinate, 30 mg, 180 Capsules

ThorneClinical88Dose fit91Popularity96$0.20/ serving

Reduce diarrhea

Which ingredient types matter for diarrheaOpen to see which ingredient types matter for diarrhea

Probiotics & Microorganisms

Minerals & Trace Elements

Glandulars & Animal-Derived Extracts

Fibers & Prebiotics

Adsorbents & Inert Functional Materials

Best products for diarrhea

Paradise Herbs, Earth's Blend, Zinc Picolinate, 30 mg, 90 Vegetarian Capsules

Solgar, Zinc Picolinate, 22 mg, 100 Tablets

NOW Foods, Zinc Picolinate, 50 mg, 120 Veg Capsules

California Gold Nutrition, Zinc Picolinate, 50 mg, 120 Veggie Capsules

Swanson Vitamins, Zinc Picolinate, 22 mg, 60 Vegan Capsules

Country Life, Zinc Picolinate, 25 mg, 100 Tablets

SMNutrition, Triple Action Clear 3, 120 Capsules

Nutricost, Zinc Picolinate, 30 mg, 240 Capsules

Nature's Life, Protecting Zinc Plus Copper, 250 Capsules

Thorne, Zinc Picolinate, 30 mg, 180 Capsules

What every metric means

Compare the top 3, side by side

Not sure which is right for you?

Get a personal report

Frequently asked

Related outcomes

Best products for diarrhea

Paradise Herbs, Earth's Blend, Zinc Picolinate, 30 mg, 90 Vegetarian Capsules

Solgar, Zinc Picolinate, 22 mg, 100 Tablets

NOW Foods, Zinc Picolinate, 50 mg, 120 Veg Capsules

California Gold Nutrition, Zinc Picolinate, 50 mg, 120 Veggie Capsules

Swanson Vitamins, Zinc Picolinate, 22 mg, 60 Vegan Capsules

Country Life, Zinc Picolinate, 25 mg, 100 Tablets

SMNutrition, Triple Action Clear 3, 120 Capsules

Nutricost, Zinc Picolinate, 30 mg, 240 Capsules

Nature's Life, Protecting Zinc Plus Copper, 250 Capsules

Thorne, Zinc Picolinate, 30 mg, 180 Capsules

Related outcomes

Compare the top 3, side by side

Which ingredient types matter for diarrheaOpen to see which ingredient types matter for diarrhea

Probiotics & Microorganisms

Minerals & Trace Elements

Glandulars & Animal-Derived Extracts

Fibers & Prebiotics

Adsorbents & Inert Functional Materials