Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

Reishi Ingredients & Drug Interactions

by Ancient Nutrition

Reishi label
See full label image
Tablet Or Pill 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 Reishi 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

Reishi is a dietary supplement by Ancient Nutrition with 1 active ingredient. Its ingredients are commonly taken for immune support, fatigue and general well-being, stress and sleep.Based on those ingredients, 375 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Reishi Mushroom Extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Reishi by Ancient Nutrition

Ask about any prescription or over-the-counter medication and we check it for interactions with Reishi by Ancient Nutrition — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
Prefer a human? Send your question to our licensed pharmacists — free, answered by email within 24 hours.

HelloPharmacist Scorecard of Reishi by Ancient Nutrition

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 Sep 10, 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: reishi mushroom extract. Reishi is a fungus used traditionally in herbal medicine.

The tablet also contains several inactive ingredients — gum acacia, beet root powder, carnauba wax, agave inulin, guar gum, sunflower lecithin, glycerin, and rice hull concentrate — which serve as binders, fillers, and capsule material.

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 — see Reishi Mushroom's own graded uses on its monograph.

Why this rating?
  • The label markets this product for: Stress and immune system support.
  • We looked for evidence on: Stress, Psychological well-being, Chronic fatigue syndrome (CFS), Insomnia, Influenza, anxiety — and 3 related terms.
  • The closest evidence on file: Reishi Mushroom is rated "Insufficient Reliable Evidence To Rate" for Chronic fatigue syndrome (CFS) (Natural Medicines).
  • Also on file: Reishi Mushroom is rated "Insufficient Reliable Evidence To Rate" for Influenza, Insomnia, Stress, Psychological well-being.

The evidence for reishi is limited. Our data shows it is possibly ineffective for high cholesterol (hyperlipidemia).

For altitude sickness, Alzheimer disease, and athletic performance, there isn't enough reliable evidence to say whether reishi works or doesn't — the science just isn't there yet.

The evidence, ingredient by ingredient Reishi Mushroom

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.

Reishi mushroom is generally well tolerated in the short term, but how safe it is over the long haul isn't well studied. The most common side effects are dizziness, dry mouth, itching, nausea, rash, and stomach upset.

A small number of people may also experience respiratory allergy to reishi spores, sore throat, runny nose, insomnia, or headache. Not enough safety data exists for pregnancy or breastfeeding, so the safety information advises against it in both cases.

If you're pregnant, planning to become pregnant, or breastfeeding, talk with your doctor or pharmacist about whether this product is right for you.

Side effects, ingredient by ingredient Reishi Mushroom

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 — Reishi Mushroom.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications.
  • For scale: 375 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.

Before you take Reishi, double-check if you're on any blood thinners (anticoagulants or antiplatelet drugs) — higher doses may increase bleeding risk. If you take blood pressure medications, reishi could lower your pressure further, so your dose might need adjusting.

Also flag any diabetes medications with your doctor, since reishi's effect on blood sugar in humans isn't clear.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

Reishi is generally well tolerated short-term, but it's not a proven remedy for the conditions we have data on. The main concern is interaction with blood pressure, blood thinner, and diabetes medications — if you take any of these, check with your doctor or pharmacist before starting.

Pregnant or breastfeeding? The safety data isn't clear enough, so discuss it with your healthcare provider first.

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 Jan 23, 2023.

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 Reishi, straight from the product label.

Brand Ancient Nutrition
Barcode (UPC) 816401025500
Net contents 30 Tablet(s)
Market status On market
Date entered into DSLD Jan 23, 2023
DSLD ID 273358
Product type Botanical
Supplement form Tablet Or Pill
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 Reishi by Ancient Nutrition, 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 Tablet(s)
Maximum serving Sizes:
1 Tablet(s)
Servings per container
30
UPC/BARCODE
816401025500
IngredientAmount% DV
Reishi Mushroom Extract1 Gram(s)--

Other ingredients: Gum Acacia, Beet root powder, organic Copernicia cerifera Wax, Agave Inulin, Guar Gum, Sunflower Lecithin, Glycerin, Rice hull concentrate

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

Optimized for absorption

Stress and immune system support

Color and odor may vary from lot to lot.

Certified Organic by CCOF

Brand IP Statement(s)

Dr. Axe formula

Seals/Symbols

USDA Organic

Suggested/Recommended/Usage/Directions

Once daily

Suggested Use: Adults take 1 tablet per day.

FDA Statement of Identity

Whole Food Dietary Supplement

Precautions

Warning: As with any dietary supplement consult your healthcare practitioner before using this product, especially if you are pregnant, nursing or under medical supervision. If you are currently undergoing HIV treatment, chemotherapy, or allograft therapy, do not use before consulting your physician.

Do not use if safety seal is broken or missing.

Keep out of reach of children.

Notice: Use this product as a food supplement only. Do not use for weight reduction.

Storage

Store in a cool, dry place.

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.

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

See for yourself

Reishi by Ancient Nutrition label

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

Reishi 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 Reishi by Ancient Nutrition

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

Serving size1 Tablet(s) Dosage formTablet Or Pill Servings per container30 Amounts shown are per serving.

Reishi Mushroom Extract

Interacts with
375 drugs
1 Gram(s) per serving

Reishi is a traditional Asian mushroom widely used to support the immune system and overall wellness. Human evidence for most of its claimed benefits...

Reishi Mushroom Extract monograph & interactions

Other (inactive) ingredients: Gum Acacia, Beet root powder, Organic Copernicia cerifera Wax, Agave Inulin, Guar Gum, Sunflower Lecithin, Glycerin, Rice hull concentrate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Reishi by Ancient Nutrition Drug Interactions

Want to check YOUR meds against Reishi?

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
375Drugs
375 Moderate

Ingredients driving the most interactions

Reishi Mushroom Extract 375

Individual Drug Interactions

The ingredients in Reishi interact with 375 drugs. Click any drug to see the details.

1 of the 1 ingredient in Reishi interact with drugs. Each result below shows which ingredient is responsible. Reishi Mushroom Extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Reishi 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.

Reishi Mushroom Extract3 drug types · 375 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, high doses of reishi mushroom might increase the risk of bleeding.
A dose of 1.5 grams daily of reishi mushroom does not seem to decrease platelet aggregation, but a higher dose of 3 grams daily does.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, reishi mushroom might have additive effects with antidiabetes drugs.
Animal research suggests that reishi mushroom decreases blood sugar. However, in patients with type 2 diabetes, taking reishi mushroom does not reduce fasting glucose levels, and its effects on glycated hemoglobin are inconsistent.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, concurrent use of reishi mushroom with antihypertensive drugs might increase the risk of hypotension.
Reishi mushroom has shown hypotensive activity in animal research. Clinical evidence suggests that reishi mushroom reduces blood pressure in some, but not all, patients with hypertension.

Likelihood Possible Evidence D
Reishi Mushroom Extract full monograph & interactions
The maker

Brand information

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

Ancient Nutrition

See all Ancient Nutrition products
Name
Ancient Nutrition, LLC
Street Address
415 Duke Drive Suite 380
City
Franklin
State
TN
ZipCode
37067
Web Address
www.AncientNutrition.com
Pharmacist Counseling Corner

Reishi by Ancient Nutrition: Common Questions

Does Reishi by Ancient Nutrition interact with any medications?
Yes. Based on its ingredients, Reishi has a known interaction with 375 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Reishi 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 Reishi if I'm on blood pressure medication?
Possibly, but not without checking first. Reishi can lower blood pressure on its own, so combining it with your blood pressure drug might make your pressure drop too low. Talk with your doctor or pharmacist — they may need to monitor you or adjust your dose.
What are the most common side effects?
Most often, people report dizziness, dry mouth, itching, nausea, rash, or stomach upset. A small number also experience respiratory allergy to reishi spores, sore throat, runny nose, insomnia, or headache.
Is Reishi safe during pregnancy or while breastfeeding?
Not enough safety data exists for either. The safety information advises against it in both cases. If you're pregnant, planning to become pregnant, or breastfeeding, talk with your doctor or pharmacist before taking it.
Does Reishi actually work for high cholesterol?
Our data rates it as possibly ineffective for high cholesterol. For other conditions like altitude sickness or Alzheimer disease, there simply isn't enough reliable evidence to say whether it works.
Can Reishi interact with diabetes medication?
Possibly. Reishi might affect blood sugar, but human studies in type 2 diabetes show mixed or absent effects, so the actual risk in real life isn't clear. If you take diabetes medication, mention reishi to your doctor or pharmacist before starting.
What makes up this tablet besides reishi?
Several inactive ingredients act as binders and fillers: gum acacia, beet root powder, carnauba wax, agave inulin, guar gum, sunflower lecithin, glycerin, and rice hull concentrate.

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

Not sure if Reishi is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.

Reishi label
Go deeper

The Full Monographs Behind Reishi’s Ingredients

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

Herb & supplement monograph

Reishi Mushroom

Interacts with 375 drugs

Reishi is a traditional Asian mushroom widely used to support the immune system and overall wellness. Human evidence for most of its claimed benefits is limited or low-quality, so it should...

Read the full Reishi Mushroom monograph →
Sources

Sources & How We Checked

Reishi'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 17 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.

Reishi Mushroom 17 references
  1. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  2. Tao J, Feng KY. Experimental and clinical studies on inhibitory effect of ganoderma lucidum on platelet aggregation. J Tongji Med Univ 1990;10:240-3. PubMed
  3. Singh AB, Gupta SK, Pereira BM, Prakash D. Sensitization to Ganoderma lucidum in patients with respiratory allergy in India. Clin Exp Allergy 1995;25:440-7.
  4. Lee SY, Rhee HM. Cardiovascular effects of mycelium extract of Ganoderma lucidum: inhibition of sympathetic outflow as a mechanism of its hypotensive action. Chem Pharm Bull (Tokyo) 1990;38:1359-64. PubMed
  5. Kwok Y, Ng KFJ, Li, CCF, et al. A prospective, randomized, double-blind, placebo-controlled study of the platelet and global hemostatic effects of Ganoderma lucidum (Ling-Zhi) in healthy volunteers. Anesth Analg 2005;101:423-6. PubMed
  6. Wanmuang, H., Leopairut, J., Kositchaiwat, C., Wananukul, W., and Bunyaratvej, S. Fatal fulminant hepatitis associated with Ganoderma lucidum (Lingzhi) mushroom powder. J Med Assoc Thai. 2007;90(1):179-181.
  7. Seto, S. W., Lam, T. Y., Tam, H. L., Au, A. L., Chan, S. W., Wu, J. H., Yu, P. H., Leung, G. P., Ngai, S. M., Yeung, J. H., Leung, P. S., Lee, S. M., and Kwan, Y. W. Novel hypoglycemic effects of Ganoderma lucidum water-extract in obese/diabetic (+db/+db
  8. Chu, T. T., Benzie, I. F., Lam, C. W., Fok, B. S., Lee, K. K., and Tomlinson, B. Study of potential cardioprotective effects of Ganoderma lucidum (Lingzhi): results of a controlled human intervention trial. Br.J.Nutr. 2012;107(7):1017-1027.
  9. Jin, X., Ruiz, Beguerie J., Sze, D. M., and Chan, G. C. Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane.Database.Syst.Rev. 2012;6:CD007731.
  10. Kabir, Y., Kimura, S., and Tamura, T. Dietary effect of Ganoderma lucidum mushroom on blood pressure and lipid levels in spontaneously hypertensive rats (SHR). J Nutr Sci Vitaminol.(Tokyo) 1988;34(4):433-438. PubMed
  11. Kanmatsuse, K., Kajiwara, N., Hayashi, K., Shimogaichi, S., Fukinbara, I., Ishikawa, H., and Tamura, T. [Studies on Ganoderma lucidum. I. Efficacy against hypertension and side effects]. Yakugaku Zasshi 1985;105(10):942-947. PubMed
  12. Gao, Y., Lan, J., Dai, X., Ye, J., and Zhou, S. A Phase I/II Study of Ling Zhi Mushroom Ganoderma lucidum(W.Curt: Fr.) Lloyd (Aphyllophoromycetideae) Extract in Patients with Type II Diabetes Mellitus. International Journal of Medicinal Mushrooms 2004;6. DOI
  13. Jin H, Zhang G, Cao X, and et al. Treatment of hypertension by linzhi combined with hypotensor and its effects on arterial, arteriolar and capillary pressure and microcirculation. In: Niimi H, Xiu RJ, Sawada T, and et al. Microcirculatory Approach to Asi
  14. Klupp NL, Chang D, Hawke F, Kiat H, Cao H, Grant SJ, Bensoussan A. Ganoderma lucidum mushroom for the treatment of cardiovascular risk factors. Cochrane Database Syst Rev. 2015 Feb 17;2:CD007259. PubMed
  15. Zhao H, Zhang Q, Zhao L, Huang X, Wang J, Kang X. Spore Powder of Ganoderma lucidum Improves Cancer-Related Fatigue in Breast Cancer Patients Undergoing Endocrine Therapy: A Pilot Clinical Trial. Evid Based Complement Alternat Med. 2012;2012:809614.
  16. Pazzi F, Adsuar JC, Domínguez-Muñoz FJ, García-Gordillo MA, Gusi N, Collado-Mateo D. Ganoderma lucidum effects on mood and health-related quality of life in women with fibromyalgia. Healthcare (Basel) 2020;8(4):520. PubMed
  17. Kogure T, Koiwai A, Fukushi D, et al. Hypereosinophilia with hepatic nodule formation caused by Ganoderma lucidum. Intern Med 2021;60(24):3897-3903.

See these in context on the Reishi Mushroom 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

Keep exploring
Supplement interaction checker › Check any supplement or product against your medications Drug–drug interactions › Check two or more of your medications against each other Browse medications A–Z › Every drug we've checked against herbs & supplements NDC & pricing lookup › Find a drug’s NDCs, packaging and costs Ask a pharmacist › Free, personal answer from our licensed team