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Dietary supplement

Chaga Extract Ingredients & Drug Interactions

by Host Defense Organic Mushrooms

Chaga Extract label
See full label image
Liquid Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Chaga Extract 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

Chaga Extract is a dietary supplement by Host Defense Organic Mushrooms with 1 active ingredient. Its ingredients are commonly taken for immune support, antioxidant support, general wellness/tonic.Based on those ingredients, 327 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are fresh Chaga (Inonotus obliquus) mycelium extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Chaga Extract by Host Defense Organic Mushrooms

Ask about any prescription or over-the-counter medication and we check it for interactions with Chaga Extract by Host Defense Organic Mushrooms — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Chaga Extract by Host Defense Organic Mushrooms

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 Jul 16, 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 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: fresh Chaga (Inonotus obliquus) mycelium extract, a fungal compound traditionally used in herbal medicine. The liquid also includes water, alcohol, and myceliated brown rice as inactive ingredients.

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

We hold no graded evidence for this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Antioxidant and DNA support.
  • We looked for evidence on: Oxidative stress, DNA damage, Cellular health.
  • Our graded evidence for these ingredients doesn't cover that particular purpose.

The evidence we hold doesn't establish that chaga works for cardiovascular disease, diabetes, or COVID-19—the data for those uses is rated insufficient. We don't have effectiveness ratings for other uses, so if you're considering chaga for something else, that safety or benefit question belongs with your doctor or pharmacist.

The evidence, ingredient by ingredient Chaga

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 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Chaga is generally used in foods and teas, but human safety data are limited. There have been two cases of kidney failure and one case of acute inflammation of the kidney (nephropathy) tied to excessive chaga consumption; chaga contains high concentrations of oxalate, which can build up in the body.

The safety data advises against use during pregnancy and while breastfeeding because there isn't enough information to know either way.

Side effects, ingredient by ingredient Chaga

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?
  • 1 of the 1 matched ingredient can interact with medications — Chaga.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications.
  • For scale: 327 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 with your doctor or pharmacist before taking this product if you're on blood thinners or antiplatelet drugs (warfarin, aspirin, clopidogrel), immunosuppressants (medications after transplant or for autoimmune conditions), or antidiabetes drugs. These are the medication types with documented interactions.

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.

Chaga Extract may be worth considering if you're interested in traditional mushroom supplements, but if you take blood thinners, immunosuppressants, or diabetes medications, you'll want to check with your doctor or pharmacist first. Avoid it during pregnancy and breastfeeding.

If you have a history of kidney issues, talk it over with your healthcare provider before starting.

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

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Sep 24, 2021.

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 Chaga Extract, straight from the product label.

Brand Host Defense Organic Mushrooms
Net contents 1 Fluid Ounce; 30 mL
Market status On market
Date entered into DSLD Sep 24, 2021
DSLD ID 255135
Product type Non-nutrient/non-botanical
Supplement form Liquid
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Organic
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 Chaga Extract by Host Defense Organic Mushrooms, 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:
1 mL
Maximum serving Sizes:
1 mL
Servings per container
30
IngredientAmount% DV
fresh Chaga (Inonotus obliquus) mycelium extract1 mL--

Other ingredients: Water, Alcohol, myceliated Brown Rice

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.
Formulation

The Source Full spectrum of active constituents Grown & processed in the USA Purity assured Double extracted Optimized, peak life cycle selection P-Value Certified for maximum growth

Antioxidant & DNA Support

USDA Organic

Certified Organic by the Washington State Department of Agriculture.

General Statements

From the Forest, to our Farm, to You

About the Founder Paul Stamets believes in the power of Mycelium, the network of thread-like cells that produces mushrooms. Paul wants everyone to share in the benefits from the Host Defense line of products. Mentored by the greatest mycologists of our time, he integrates and expands upon the knowledge of our ancestors.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Formula

Made with U.S. Grown, Double Extracted Organic Mushrooms

Host defense Chaga Embraced by Eurasians for centuries and found throughout boreal forests, Chaga grows primarily on birch trees. Studied and treasured worldwide for its health-enhancing and anti-oxidant properties Chaga is a unique species and the focus of recent and ongoing scientific research.

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

USDA Organic

Producer Certified Organic Washington State Department of Agriculture

Suggested/Recommended/Usage/Directions

Directions of Use: As a dietary supplement, take 1 mL twice per day. Can be taken with food or without, on an empty stomach or as recommended by your healthcare advisor.

Precautions

Consult your healthcare advisor regarding the use of this product during pregnancy.

Keep out of reach of children.

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

See for yourself

Chaga Extract by Host Defense Organic Mushrooms label

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

Chaga Extract 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 Chaga Extract by Host Defense Organic Mushrooms

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 mL Dosage formLiquid Servings per container30 Amounts shown are per serving.

Fresh Chaga (Inonotus obliquus) mycelium extract

Interacts with
327 drugs
1 mL per serving

Chaga is a fungus that grows mostly on birch trees and is used as a tea or supplement, mainly for immune and antioxidant support. Human evidence for i...

Fresh Chaga (Inonotus obliquus) mycelium extract monograph & interactions

Other (inactive) ingredients: Water, Alcohol, Myceliated Brown Rice. These complete the product’s ingredient list but are not active constituents.

Interaction report

Chaga Extract by Host Defense Organic Mushrooms Drug Interactions

Want to check YOUR meds against Chaga Extract?

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
327Drugs
327 Moderate

Ingredients driving the most interactions

fresh Chaga (Inonotus obliquus) mycelium extract 327

Individual Drug Interactions

The ingredients in Chaga Extract interact with 327 drugs. Click any drug to see the details.

1 of the 1 ingredient in Chaga Extract interact with drugs. Each result below shows which ingredient is responsible. fresh Chaga (Inonotus obliquus) mycelium extract

Each ingredient & the kinds of drugs it affects

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

fresh Chaga (Inonotus obliquus) mycelium extract3 drug types · 327 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, chaga may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
In vitro and animal research suggests that chaga extract can inhibit platelet aggregation. This effect has not been reported in humans.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, taking chaga with antidiabetes drugs might increase the risk of hypoglycemia.
Animal research suggests that chaga might decrease blood glucose levels and increase insulin levels. This has not been reported in humans.

Likelihood Possible Evidence D
Immunosuppressants

Theoretically, chaga might interfere with immunosuppressive therapy.
In vitro research suggests that certain constituents of chaga stimulate immune function. This has not been reported in humans.

Likelihood Possible Evidence D
fresh Chaga (Inonotus obliquus) mycelium extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Chaga Extract, from the product label.

Host Defense Organic Mushrooms

See all Host Defense Organic Mushrooms products
Name
Fungi Perfecti, LLC
Street Address
PO Box 7634
City
Olympia
State
WA
ZipCode
98507
Web Address
HOSTDEFENSE.COM
Pharmacist Counseling Corner

Chaga Extract by Host Defense Organic Mushrooms: Common Questions

Does Chaga Extract by Host Defense Organic Mushrooms interact with any medications?
Yes. Based on its ingredients, Chaga Extract has a known interaction with 327 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Chaga Extract contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism 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.
Can I take Chaga if I'm on a blood thinner like warfarin?
Not without talking to your doctor first. Chaga may increase your bleeding risk when combined with blood thinners or antiplatelet drugs like warfarin or aspirin. The effect hasn't been seen in humans yet, but animal research suggests it's possible—it's a Moderate-severity concern worth clearing with your prescriber.
Is this safe during pregnancy?
No, the safety data advises against it. There isn't enough information to know whether chaga is safe in pregnancy, so it's best to avoid it and talk with your doctor or pharmacist if you're pregnant or planning to become pregnant.
Is this safe while breastfeeding?
No, the safety data advises against it. Not enough is known about chaga's safety during breastfeeding, so it's best to avoid it. Talk with your doctor or pharmacist for personalized advice if you're nursing.
What are the side effects?
Human safety data are limited, but there have been rare cases of kidney failure and kidney inflammation tied to excessive chaga use. This is because chaga contains high concentrations of oxalate, which can accumulate. If you have kidney issues or take large amounts, talk with your doctor first.
Can I take this if I'm on diabetes medication?
Check with your doctor or pharmacist before starting. Animal research suggests chaga might lower blood sugar and raise insulin, which could increase your risk of low blood sugar (hypoglycemia) if you're already on antidiabetes drugs. It's a Moderate-severity concern that needs clearing with your prescriber.
Does chaga actually work for heart disease or diabetes?
The evidence we hold doesn't establish that it does. For both cardiovascular disease and diabetes, the data is rated insufficient, so we can't say whether chaga is effective. If you're considering it for those conditions, talk it over with your doctor.

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

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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.

Chaga Extract label
Go deeper

The Full Monographs Behind Chaga Extract’s Ingredients

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

Herb & supplement monograph

Chaga

Interacts with 327 drugs

Chaga is a fungus that grows mostly on birch trees and is used as a tea or supplement, mainly for immune and antioxidant support. Human evidence for its benefits is very limited, and it may...

Read the full Chaga monograph →
Sources

Sources & How We Checked

Chaga Extract'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 9 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.

Chaga 9 references
  1. Sun JE, Ao ZH, Lu ZM, et al. Antihyperglycemic and antilipidperoxidative effects of dry matter of culture broth of Inonotus obliquus in submerged culture on normal and alloxan-diabetes mice. J Ethnopharmacol 2008;118(1):7-13. PubMed
  2. Hyun KW, Jeong SC, Lee DH, et al. Isolation and characterization of a novel platelet aggregation inhibitory peptide from the medicinal mushroom, Inonotus obliquus. Peptides 2006;27(6):1173-8. PubMed
  3. Kim YO, Han SB, Lee HW, et al. Immuno-stimulating effect of the endo-polysaccharide produced by submerged culture of Inonotus obliquus. Life Sci 2005;77(19):2438-56. PubMed
  4. Kikuchi Y, Seta K, Ogawa Y, et al. Chaga mushroom-induced oxalate nephropathy. Clin Nephrol 2014;81(6):440-4. PubMed
  5. Lee S, Lee HY, Park Y, et al. Development of end stage renal disease after long-term ingestion of chaga mushroom: case report and review of literature. J Korean Med Sci. 2020;35(19):e122.
  6. Kwon O, Kim Y, Paek JH, et al. Chaga mushroom-induced oxalate nephropathy that clinically manifested as nephrotic syndrome: A case report. Medicine (Baltimore) 2022;101(10):e28997. PubMed
  7. Su L, Xin C, Yang J, et al. A polysaccharide from Inonotus obliquus ameliorates intestinal barrier dysfunction in mice with type 2 diabetes mellitus. Int J Biol Macromol 2022;214:312-323. PubMed
  8. Chen S, Ma Y, Li H, et al. Anti-diabetic e?ects of Inonotus obliquus extract in high fat diet combined streptozotocin-induced type 2 diabetic mice. Nutr Hosp 2022;39(6):1256-1263. PubMed
  9. Ye X, Wu K, Xu L, et al. Methanol extract of Inonotus obliquus improves type 2 diabetes mellitus through modifying intestinal flora. Front Endocrinol (Lausanne) 2023;13:1103972. PubMed

See these in context on the Chaga 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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