Interactions on record — worth a quick check against your medications. Based on 3 of 5 ingredients. Check your meds →
Dietary supplement

ChagaStrength Ingredients & Drug Interactions

by Physician's Strength

ChagaStrength label
See full label image
Capsule Category: 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 ChagaStrength 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

ChagaStrength is a dietary supplement by Physician's Strength with 5 active ingredients. Its ingredients are commonly taken for immune support, antioxidant support, general wellness/tonic.Based on those ingredients, 402 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are wild, raw Chaga Mushroom powder, wild, organic desiccated Oregano Oil, wild, raw White Birch bark powder. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against ChagaStrength by Physician's Strength

Ask about any prescription or over-the-counter medication and we check it for interactions with ChagaStrength by Physician's Strength — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of ChagaStrength by Physician's Strength

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 12, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 5 active ingredients.
  • “Proprietary Blend” is a proprietary blend — the label gives one combined amount (400 mg) without saying how much of each component you get.

ChagaStrength contains five active ingredients: wild, raw chaga mushroom powder; wild Black Siberian chaga powder; wild, organic desiccated oregano oil; wild, organic Mediterranean oregano; and wild, raw white birch bark powder. The product also includes pullulan as an inactive ingredient — that's a capsule binder.

Two of the actives are chaga (a type of mushroom that grows on birch trees), two are oregano (an herb commonly used in cooking), and one is white birch bark. The chaga and oregano are both sourced as wild varieties, and the oregano is certified organic.

Does it work?

Not established
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 established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use.

Why this rating?
  • The label markets this product for: immune support and physical wellness.
  • We looked for evidence on: Coronavirus disease 2019 (COVID-19), Upper respiratory tract infection (URTI), Bronchitis, Cough, Rhinosinusitis, Intestinal parasite infection — and 4 related terms.
  • The closest evidence on file: Birch is rated "Insufficient Reliable Evidence To Rate" for Urinary tract infections (UTIs) (Natural Medicines).
  • Also on file: Oregano is rated "Insufficient Reliable Evidence To Rate" for Bronchitis, Upper respiratory tract infection (URTI), Cough, Intestinal parasite infection, and more.

The evidence we hold doesn't establish that ChagaStrength works for any specific condition. The chaga ingredients are rated as having insufficient reliable evidence for cardiovascular disease, diabetes, and COVID-19.

Both oregano ingredients are rated as having insufficient reliable evidence for acne, bronchitis, asthma, headache, and upper respiratory infections. The birch bark ingredient is rated as having insufficient reliable evidence for joint pain, hair loss (alopecia), and dandruff.

In short, none of these ingredients have strong evidence backing their use in supplements right now.

The evidence, ingredient by ingredient Chaga Oregano Birch

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 3 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.

Chaga is generally used in foods and teas, but human safety data are limited. There have been rare cases of kidney problems from very high chaga intake because it contains high concentrations of oxalate, so if you have any kidney concerns, talk to us before you start.

Oregano is well tolerated in food amounts, but concentrated oregano oil supplements are stronger and less studied — you may see mild stomach upset. Serious allergic reactions (including anaphylaxis) have been reported rarely with oregano.

White birch bark is generally well tolerated in food-like amounts, but allergic reactions to birch and birch pollen do happen, and allergic contact dermatitis has been reported in rare cases. During pregnancy, the safety data advise against chaga and oregano — there isn't enough information to know it's safe.

Birch supplements are also best avoided in pregnancy. For breastfeeding, there isn't enough data for any of these ingredients, so talk with your doctor or pharmacist before using this product if you're nursing.

Side effects, ingredient by ingredient Chaga Oregano Birch

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 — Birch, Oregano, 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: 402 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 these medication types with your pharmacist before you start: blood thinners and antiplatelet drugs (moderate risk of increased bleeding), blood sugar medications (moderate risk of low blood sugar), immune-suppressing drugs (moderate risk of interference), and water pills or diuretics (minor risk). Because this product contains a proprietary blend, amounts aren't transparent — that's another reason to verify your specific medications using the tool on this page.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

ChagaStrength is a blend of mushroom and herb powders whose effectiveness isn't established yet in our data. It's a reasonable option if you're looking to explore these traditional ingredients, but you'll need to check your medications first — especially blood thinners, blood sugar drugs, and immune suppressants.

If you're pregnant or breastfeeding, talk with your pharmacist before starting.

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

Assessment coverage: 5 of 5 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jun 16, 2022.

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 ChagaStrength, straight from the product label.

Brand Physician's Strength
Net contents 90 Capsule(s)
Market status On market
Date entered into DSLD Jun 16, 2022
DSLD ID 268919
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, 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 ChagaStrength by Physician's Strength, 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 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
Servings per container
90
IngredientAmount% DV
Proprietary Blend400 mg--
wild, raw Chaga Mushroom powder0 NP--
wild, organic desiccated Oregano Oil0 NP--
wild, organic Mediterranean Oregano0 NP--
wild Black Siberian Chaga powder0 NP--
wild, raw White Birch bark powder0 NP--

Other ingredients: Pullulan

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.
Suggested/Recommended/Usage/Directions

Directions: Take one or more capsules daily with or without meals.

Formulation

ChagaStrength is the power of wild, raw chaga mushroom fortified with wild, raw birch bark and organic, wild oregano. This combination creates immense immune and physical power. Wild chaga is the world's top source of wild SOD, while birch bark is the richest source of betulin. Testing shows that the superoxide radical-quenching power of ChagaStrength is extrememly high. The wild oregano greatly fortifies the chaga. Take ChagaStrength capsules daily, and feel the difference.

Doctor's formula

100% GMO-free

Vegan

Formula

30,000 ORAC units per bottle

Wild, raw Chaga complex

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.

FDA Statement of Identity

Dietary Supplement

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

See for yourself

ChagaStrength by Physician's Strength label

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

ChagaStrength 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 ChagaStrength by Physician's Strength

These are the 5 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Servings per container90 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.

Other (inactive) ingredients: Pullulan. These complete the product’s ingredient list but are not active constituents.

Interaction report

ChagaStrength by Physician's Strength Drug Interactions

Want to check YOUR meds against ChagaStrength?

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
402Drugs
327 Moderate 75 Minor

Ingredients driving the most interactions

wild, raw Chaga Mushroom powder 327
wild, organic desiccated Oregano Oil 208
wild, raw White Birch bark powder 75

Individual Drug Interactions

The ingredients in ChagaStrength interact with 402 drugs. Click any drug to see the details.

3 of the 5 ingredients in ChagaStrength interact with drugs. Each result below shows which ingredient is responsible. wild, raw Chaga Mushroom powder wild, organic desiccated Oregano Oil wild, raw White Birch bark powder

Each ingredient & the kinds of drugs it affects

For each ingredient in ChagaStrength 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.

wild, raw Chaga Mushroom powder3 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
wild, raw Chaga Mushroom powder full monograph & interactions

wild, organic desiccated Oregano Oil2 drug types · 208 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, oregano might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
In vitro research shows that aristolochic acid isolated from oregano leaves has antithrombin activity. It has also been reported that oregano oil inhibits arachidonic acid-induced, and ADP-induced, platelet aggregation.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, oregano might increase the risk for hypoglycemia when taken with antidiabetes drugs.
In vitro and animal research shows that oregano extracts might lower blood glucose levels.

Likelihood Possible Evidence D
wild, organic desiccated Oregano Oil full monograph & interactions

wild, raw White Birch bark powder1 drug type · 75 drugs

Diuretic Drugs

Theoretically, birch might interfere with diuretic therapy.

Likelihood Possible Evidence D
wild, raw White Birch bark powder full monograph & interactions
The maker

Brand information

Manufacturer and brand details for ChagaStrength, from the product label.

Physician's Strength

See all Physician's Strength products
Name
Physician's Strength
Street Address
13900 W. Polo Trail Drive
City
Lake Forest
State
IL
ZipCode
60045
Phone Number
1-800-243-5242
Web Address
www.physicians-strength.com
Pharmacist Counseling Corner

ChagaStrength by Physician's Strength: Common Questions

Does ChagaStrength by Physician's Strength interact with any medications?
Yes. Based on its ingredients, ChagaStrength has a known interaction with 402 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
ChagaStrength contains 5 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.
Can I take ChagaStrength if I'm pregnant?
The safety data advise against it — there isn't enough information to know it's safe during pregnancy. Talk with your doctor or pharmacist about whether it's right for you.
Can I take ChagaStrength while breastfeeding?
Safety hasn't been established for any of these ingredients while breastfeeding. It's best to avoid this product or get personalized advice from your pharmacist or doctor first.
What's chaga, and what's it supposed to do?
Chaga is a mushroom that grows on birch trees. It's been used traditionally in teas and foods, but we don't have reliable evidence yet that it works for specific health conditions — the data on cardiovascular disease, diabetes, and other uses are rated as insufficient.
Could ChagaStrength upset my stomach?
Oregano, one of the main ingredients, can cause mild gastrointestinal upset, especially in larger amounts. Both ingredients are generally well tolerated, but if you have a sensitive stomach, start cautiously.
Do I need to worry about allergies?
If you have birch pollen allergies or are sensitive to oregano or plants in the mint family (Lamiaceae), you should be cautious — allergic reactions including serious ones have been reported, though they're rare. Talk to us if you have a history of plant allergies.
Why does the label list a 'proprietary blend' for some ingredients?
A proprietary blend means the exact amount of each ingredient inside isn't disclosed on the label — only the total blend weight is. That makes it harder to predict how strong the product is, which is why it's extra important to check your medications with us.

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

Not sure if ChagaStrength 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.

ChagaStrength label
Go deeper

The Full Monographs Behind ChagaStrength’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 → Herb & supplement monograph

Oregano

Interacts with 208 drugs

Oregano is a common Mediterranean cooking herb that is also sold as a concentrated oil or supplement, often standardized for a compound called carvacrol. While lab studies suggest it may hav...

Read the full Oregano monograph → Herb & supplement monograph

Birch

Interacts with 75 drugs

Birch is a tree whose leaves, bark, and sap are used in traditional remedies, most often as a mild diuretic or for joint and urinary complaints. Solid human evidence is limited, and birch is...

Read the full Birch monograph →
Sources

Sources & How We Checked

ChagaStrength'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 25 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 →

Oregano 12 references
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  2. Benito M, Jorro G, Morales C, et al. Labiatae allergy: systemic reactions due to ingestion of oregano and thyme. Ann Allergy Asthma Immunol 1996;76:416-8. PubMed
  3. Chevallier A. Encyclopedia of Herbal Medicine. 2nd ed. New York, NY: DK Publ, Inc., 2000.
  4. Ciganda C, and Laborde A. Herbal infusions used for induced abortion. J Toxicol.Clin Toxicol. 2003;41:235-239. PubMed
  5. Futrell, J. M. and Rietschel, R. L. Spice allergy evaluated by results of patch tests. Cutis 1993;52(5):288-290.
  6. Tognolini, M., Barocelli, E., Ballabeni, V., Bruni, R., Bianchi, A., Chiavarini, M., and Impicciatore, M. Comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. Life Sci. 2-23-2006;78(13):1419-1432. PubMed
  7. Goun, E., Cunningham, G., Solodnikov, S., Krasnykch, O., and Miles, H. Antithrombin activity of some constituents from Origanum vulgare. Fitoterapia 2002;73(7-8):692-694. PubMed
  8. Lemhadri, A., Zeggwagh, N. A., Maghrani, M., Jouad, H., and Eddouks, M. Anti-hyperglycaemic activity of the aqueous extract of Origanum vulgare growing wild in Tafilalet region. J Ethnopharmacol. 2004;92(2-3):251-256. PubMed
  9. McCue, P., Vattem, D., and Shetty, K. Inhibitory effect of clonal oregano extracts against porcine pancreatic amylase in vitro. Asia Pac.J Clin.Nutr. 2004;13(4):401-408.
  10. Ragi, J., Pappert, A., Rao, B., Havkin-Frenkel, D., and Milgraum, S. Oregano extract ointment for wound healing: a randomized, double-blind, petrolatum-controlled study evaluating efficacy. J.Drugs Dermatol. 2011;10(10):1168-1172.
  11. Singletary K. Oregano: overview of the literature on health benefits. Nutrition Today 2010;45(3):129-38.
  12. Silva MLAE, Lucarini R, Dos Santos FF, et al. Hypoglycemic effect of rosmarinic acid-rich infusion (RosCE) from Origanum vulgare in alloxan-induced diabetic rats. Nat Prod Res 2022;36(17):4525-4531.

See these in context on the Oregano monograph →

Birch 4 references
  1. Robbers JE, Tyler VE. Tyler's Herbs of Choice: The Therapeutic Use of Phytomedicinals. New York, NY: The Haworth Herbal Press, 1999.
  2. Lahti, A. and Hannuksela, M. Immediate contact allergy to birch leaves and sap. Contact Dermatitis 1980;6(7):464-465. PubMed
  3. Allam JP, Wuestenberg E, Wolf H, et al. Immunologic response and safety in birch pollen sublingual versus oral vestibule immunotherapy: a pilot study. J Allergy Clin Immunol. 2014;133(6):1757-9.e3. PubMed
  4. Meyer-Hoffert U, Brasch J. Allergic contact dermatitis caused by betulin-containing triterpene extract from the outer bark of birch (Betula alba). Contact Dermatitis. 2013;68(6):382-3.

See these in context on the Birch 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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