Improve kidney function

What this outcome means

Kidney function is how well your kidneys filter waste, balance fluids, and clear toxins from your blood. On DoseRank it maps to a defined health outcome built from human studies on eGFR, serum creatinine, and urinary albumin – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Early declineAdults whose lab numbers show filtration slipping over time.

Diabetes or hypertensionPeople whose conditions put steady strain on the kidneys.

Aging kidneysOlder adults wanting to protect filtration as they age.

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

Evidence level

78Moderate-strong

Astragalus – has moderate public evidence for this outcome. This usually means there are smaller or mechanistic studies, but not randomized human trials. 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 available ingredients

Astragalus 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: Astragalus 1000 mg vs 1000-3000 mg.

Processed

602

Available

602

Ingredients

Brands

165

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.

Improve kidney function

What this outcome means

Who it's for

Early declineAdults whose lab numbers show filtration slipping over time.

Diabetes or hypertensionPeople whose conditions put steady strain on the kidneys.

Aging kidneysOlder adults wanting to protect filtration as they age.

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

Evidence level

78Moderate-strong

Best available ingredients

Astragalus 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: Astragalus 1000 mg vs 1000-3000 mg.

Processed

602

Available

602

Ingredients

Brands

165

Coverage

100%

Relevant ingredients

Which ingredient types matter for kidney functionOpen to see which ingredient types matter for kidney function

593 products across 2 ingredient types — open to filter the ranking.

Use types to filter ranked products

Botanicals/Herbal Extracts

541 products

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

Typical: , , , ...

Adsorbents & Inert Functional Materials

52 products

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

Typical:

Top decision cards

Best products for kidney function

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for kidney function

NOW Foods, Astragalus, 500 mg, 100 Veg Capsules

NOW Foods$0.14 / serving4.7 · 3,509Available now

Why this ranks here

Evidence fitAstragalus has moderate human evidence for this outcome.
Dose fitAstragalus at 1000 mg lands inside the studied 1000-3000 mg window.
Price / serving$0.14 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 listEvidence depth trails the rest of this list

The numbers

1000 mgIn rangeinside the studied 1000-3000 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products