Reduce colds

What this outcome means

Common cold incidence is how often you catch those familiar upper-respiratory bugs, the sniffles, sore throats, and congestion that circulate through a season. On DoseRank it maps to a defined health outcome built from human studies on cold episode counts, infection frequency, and number of illnesses per season – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Catches every bugSeems to pick up each cold that passes through home or work.

Crowded-environment exposureCommuters, teachers, and parents constantly around coughs and shared surfaces.

Run-down and susceptibleBusy, low-sleep stretches when colds seem to land more easily.

Stack buildersAlready taking supplements such as American Ginseng and want the dose right.

Evidence level

92Strong

American Ginseng – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 94 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

American Ginseng is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 94

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Above range: American Ginseng 1000 mg vs 200-400 mg.

Processed

5.9k

Available

5.9k

Ingredients

Brands

492

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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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 colds

What this outcome means

Who it's for

Catches every bugSeems to pick up each cold that passes through home or work.

Crowded-environment exposureCommuters, teachers, and parents constantly around coughs and shared surfaces.

Run-down and susceptibleBusy, low-sleep stretches when colds seem to land more easily.

Stack buildersAlready taking supplements such as American Ginseng and want the dose right.

Evidence level

92Strong

Best ingredients

American Ginseng is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 94

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Above range: American Ginseng 1000 mg vs 200-400 mg.

Processed

5.9k

Available

5.9k

Ingredients

Brands

492

Coverage

100%

Relevant ingredients

Which ingredient types matter for common cold incidenceOpen to see which ingredient types matter for common cold incidence

1.6k products across 3 ingredient types — open to filter the ranking.

Use types to filter ranked products

Botanicals/Herbal Extracts

429 products

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

Typical: ,

Probiotics & Microorganisms

991 products

Live beneficial bacteria and yeasts measured in CFUs. Strain identity and viability at expiry matter far more than headline colony counts.

Typical: ,

Fibers & Prebiotics

141 products

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

Typical:

Top decision cards

Best products for common cold incidence

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for common cold incidence

NOW Foods, American Ginseng Extract, 100 Veg Capsules (500 mg per Capsule)

NOW Foods$0.23 / serving4.6 · 1,853Available now

Why this ranks here

Evidence fitAmerican Ginseng is the strongest evidence signal for this outcome.
Dose fitAmerican Ginseng at 1000 mg is higher than the studied 200-400 mg window.
Price / serving$0.23 per serving — mid price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustSolid trust signals from buyer ratings, with room to grow.

Trade-offs

Popularity trails the other picks hereTrust signals sit below the other picks

The numbers

1000 mgAbove rangehigher than the studied 200-400 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products