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Dietary supplement

Kidney Herbs Tea Ingredients & Drug Interactions

by Dr. Clark Research Association Dr. Clark Zentrum

Kidney Herbs Tea label
See full label image
Powder Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Kidney Herbs Tea against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Kidney Herbs Tea is a dietary supplement by Dr. Clark Research Association Dr. Clark Zentrum with 3 active ingredients. Its ingredients are commonly taken for kidney and bladder stones, urinary tract complaints, enlarged prostate symptoms.Based on those ingredients, 2,049 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Marshmallow, Gravel Root, Hydrangea. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum

Ask about any prescription or over-the-counter medication and we check it for interactions with Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Aug 13, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 3 of its 3 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

Kidney Herbs Tea is a 3-ingredient powder blend of hydrangea, marshmallow, and gravel root. All three are the active components; there are no other added fillers or inactive ingredients listed.

Does it work?

Couldn't assess
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not assessable

The label doesn't state a purpose we can grade — see each ingredient's own graded uses on its monograph instead.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

We have no effectiveness data on file for hydrangea or gravel root for any condition. Marshmallow has insufficient evidence to support its use for vaginal candidiasis, diarrhea, venous leg ulcers, atopic dermatitis (eczema), or respiratory tract infections—meaning studies haven't yet shown it works reliably for these purposes.

The evidence, ingredient by ingredient Hydrangea Marshmallow Gravel Root

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 2 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Hydrangea and marshmallow are generally well tolerated for short-term use, but human safety data are limited for both. Gravel root is the biggest concern: it contains liver-toxic compounds called pyrrolizidine alkaloids that can cause veno-occlusive disease (a serious liver condition with symptoms like belly pain, vomiting, diarrhea, and fluid buildup).

Lung damage and elevated blood pressure in the lungs are also possible. Because of this risk, gravel root should only be used cautiously and for short periods.

All three ingredients may cause dizziness; hydrangea may also cause stomach upset and chest tightness. All three are not recommended during pregnancy or breastfeeding—safety data are insufficient or show risk.

If you're pregnant, nursing, or planning to become pregnant, talk with your doctor or pharmacist before using this product.

Side effects, ingredient by ingredient Hydrangea Marshmallow Gravel Root

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 3 of the 3 matched ingredients can interact with medications — Hydrangea, Gravel Root, Marshmallow.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; lithium.
  • For scale: 2,050 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check before taking this product if you use lithium (all three ingredients may raise its level); blood thinners or antiplatelet drugs like warfarin or aspirin (marshmallow flower theoretically increases bleeding risk); CYP3A4 enzyme inducers such as carbamazepine, phenobarbital, phenytoin, rifampin, or rifabutin (gravel root may worsen its own liver toxicity); or any oral medications (marshmallow's mucilage may slow their absorption—wait 30–60 minutes between doses).

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This tea blends three diuretic herbs with limited human safety evidence. If you take lithium, are on blood thinners, or take medications that induce liver enzymes, you need to check with your doctor or pharmacist before starting.

Gravel root's liver-toxicity risk makes this a product to use cautiously and only short-term. Anyone pregnant or breastfeeding should not use it.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 3 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jun 24, 2020.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Kidney Herbs Tea, straight from the product label.

Brand Dr. Clark Research Association Dr. Clark Zentrum
Barcode (UPC) 7640116923119
Net contents 0.25 Pound(s); 113 Gram(s)
Market status On market
Date entered into DSLD Jun 24, 2020
DSLD ID 223508
Product type Botanical
Supplement form Powder
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
180 cc
Maximum serving Sizes:
180 cc
Servings per container
40
UPC/BARCODE
7640116923119
IngredientAmount% DV
Hydrangea38 Gram(s)--
Marshmallow38 Gram(s)--
Gravel Root38 Gram(s)--

Other ingredients: Hydrangea, Marshmallow, Gravel Root

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Herbal tea

Kidney Herbs Tea 1/4 pound (approx. 113 g)

FDA Statement of Identity

Dietary Supplement/Food Supplement

Suggested/Recommended/Usage/Directions

Prepare according to Dr. Hulda Clark's Kidney Cleanse Program.

Precautions

Store out of reach of young children.

Dietary supplements/food supplements should not be used as a substitute for a varied diet. Do not exceed the stated recommended daily dose.

Storage

Store in a dry, cool place.

Formulation

Made in the USA.

General Statements

Nominal weight: 113 g % DV = % Daily Value

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Kidney Herbs Tea label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size180 cc Dosage formPowder Servings per container40 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Hydrangea

Interacts with
1 drug
38 Gram(s) per serving

Hydrangea root has a long history in folk medicine, mainly for urinary and kidney stone complaints, but there is very little modern human research to...

Hydrangea monograph & interactions

Marshmallow

Interacts with
2,040 drugs
38 Gram(s) per serving

Marshmallow root is a traditional herb rich in soothing, gel-like fibers called mucilage, which is why it has long been used for coughs, sore throats,...

Marshmallow monograph & interactions

Gravel Root

Interacts with
88 drugs
38 Gram(s) per serving

Gravel Root is a traditional North American herb long used by herbalists for kidney stones and urinary problems, but there is very little modern scien...

Gravel Root monograph & interactions

Other (inactive) ingredients: Hydrangea, Marshmallow, Gravel Root. These complete the product’s ingredient list but are not active constituents.

Interaction report

Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum Drug Interactions

Want to check YOUR meds against Kidney Herbs Tea?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
2,049Drugs
88 Moderate 1,961 Minor

Ingredients driving the most interactions

Marshmallow 2,040
Gravel Root 88
Hydrangea 1

Individual Drug Interactions

The ingredients in Kidney Herbs Tea interact with 2,049 drugs. Click any drug to see the details.

3 of the 3 ingredients in Kidney Herbs Tea interact with drugs. Each result below shows which ingredient is responsible. Marshmallow Gravel Root Hydrangea

Each ingredient & the kinds of drugs it affects

For each ingredient in Kidney Herbs Tea with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Marshmallow3 drug types · 2,040 drugs

Lithium

Theoretically, due to potential diuretic effects, marshmallow might reduce excretion and increase levels of lithium.
Marshmallow is thought to have diuretic properties. To avoid lithium toxicity, the dose of lithium might need to be decreased when used with marshmallow.

Likelihood Probable Evidence D
Anticoagulant/Antiplatelet Drugs

Theoretically, marshmallow flower might have antiplatelet effects.
Animal research suggests that marshmallow flower extract has antiplatelet effects. However, the root and leaf of marshmallow, not the flower, are the plant parts most commonly found in dietary supplements. Theoretically, use of marshmallow flower with anticoagulant/antiplatelet drugs can have additive effects, and might increase the risk for bleeding in some patients.

Likelihood Unlikely Evidence D
Oral Drugs

Theoretically, mucilage in marshmallow might impair absorption of oral drugs.
Marshmallow contains mucilage which can affect oral drug absorption. To avoid changes in absorption, take marshmallow 30-60 minutes after oral medications.

Likelihood Possible Evidence D
Marshmallow full monograph & interactions

Gravel Root2 drug types · 88 drugs

Cytochrome P450 3A4 (Cyp3A4) Inducers

Hepatotoxic pyrrolizidine alkaloids (PA) are substrates of cytochrome P450 3A4 (CYP3A4). Theoretically, drugs that induce CYP3A4 might increase the conversion of PAs to toxic metabolites. Some drugs that induce CYP3A4 include carbamazepine (Tegretol), phenobarbital, phenytoin (Dilantin), rifampin, rifabutin (Mycobutin), and others.

Likelihood Possible Evidence D
Lithium

Gravel root is thought to have diuretic properties. Theoretically, due to these potential diuretic effects, gravel root might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.

Likelihood Probable Evidence D
Gravel Root full monograph & interactions

Hydrangea1 drug type · 1 drug

Lithium

Hydrangea is thought to have diuretic properties. Theoretically, due to these potential diuretic effects, hydrangea might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.

Likelihood Probable Evidence D
Hydrangea full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Kidney Herbs Tea, from the product label.

Dr. Clark Research Association Dr. Clark Zentrum

See all Dr. Clark Research Association Dr. Clark Zentrum products
Name
Dr. Clark Zentrum Limited
Street Address
152 Naxxar Road #7, SGN 9030
City
San Gwann
State
Malta
Web Address
www.drclark.com
Pharmacist Counseling Corner

Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum: Common Questions

Does Kidney Herbs Tea by Dr. Clark Research Association Dr. Clark Zentrum interact with any medications?
Yes. Based on its ingredients, Kidney Herbs Tea has a known interaction with 2,049 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Kidney Herbs Tea contains 3 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What does gravel root actually do in this tea?
We have no data on what gravel root is effective for. What we do know is it contains compounds that can damage your liver and lungs with regular or long-term use, so this ingredient is one to be cautious about.
Can I take this while pregnant or breastfeeding?
No. Gravel root is rated likely unsafe during both pregnancy and breastfeeding, and hydrangea and marshmallow don't have enough safety data to recommend them either. Talk with your doctor or pharmacist before considering it.
Why would marshmallow interact with my other medicines?
Marshmallow contains a thick, gummy substance called mucilage that coats your digestive tract. This coating can slow how your body absorbs oral medications. If you take this tea, space it at least 30–60 minutes away from your other drugs.
I'm on lithium. Is this safe for me?
No, not without talking to your doctor first. All three herbs in this blend may reduce how your body clears lithium, which could raise its level and cause toxicity. Your lithium dose might need to be adjusted.
What side effects might I notice?
The main ones reported are dizziness, stomach upset, and (with hydrangea) a feeling of chest tightness. The bigger concern is gravel root's potential to damage your liver or lungs if used regularly or long-term.
How long is it safe to use this tea?
The data we have recommend short-term use only, and gravel root should be used cautiously because of its liver-toxicity risk. Talk with your doctor or pharmacist about how long you should take it.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Kidney Herbs Tea is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Kidney Herbs Tea label
Go deeper

The Full Monographs Behind Kidney Herbs Tea’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Hydrangea

Interacts with 1 drug

Hydrangea root has a long history in folk medicine, mainly for urinary and kidney stone complaints, but there is very little modern human research to confirm it works for any condition. Beca...

Read the full Hydrangea monograph → Herb & supplement monograph

Marshmallow

Interacts with 2,040 drugs

Marshmallow root is a traditional herb rich in soothing, gel-like fibers called mucilage, which is why it has long been used for coughs, sore throats, and stomach irritation. Evidence for th...

Read the full Marshmallow monograph → Herb & supplement monograph

Gravel Root

Interacts with 88 drugs

Gravel Root is a traditional North American herb long used by herbalists for kidney stones and urinary problems, but there is very little modern scientific evidence to support these uses. Be...

Read the full Gravel Root monograph →
Sources

Sources & How We Checked

Kidney Herbs Tea's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 11 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Hydrangea 1 reference
  1. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.

See these in context on the Hydrangea monograph →

Marshmallow 5 references
  1. Monographs on the medicinal uses of plant drugs. Exeter, UK: European Scientific Co-op Phytother, 1997.
  2. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  3. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  4. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  5. Hage-Sleiman R, Mroueh M, Daher CF. Pharmacological evaluation of aqueous extract of Althaea officinalis flower grown in Lebanon. Pharm Biol 2011;49(3):327-33.

See these in context on the Marshmallow monograph →

Gravel Root 5 references
  1. WHO working group. Pyrrolizidine alkaloids. Environmental Health Criteria, 80. WHO: Geneva, 1988.
  2. Stickel F, Seitz HK. The efficacy and safety of comfrey. Public Health Nutr 2000;3:501-8. PubMed
  3. Chojkier M. Hepatic sinusoidal-obstruction syndrome: toxicity of pyrrolizidine alkaloids. J Hepatol 2003;39:437-46. PubMed
  4. Roeder E. Medicinal plants in Europe containing pyrrolizidine alkaloids. Pharmazie 1995;50:83-98.
  5. Wang YP, Yan J, Fu PP, Chou MW. Human liver microsomal reduction of pyrrolizidine alkaloid N-oxides to form the corresponding carcinogenic parent alkaloid. Toxicol Lett 2005;155:411-20. PubMed

See these in context on the Gravel Root monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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