Mushroom Coffee: What It Is, Caffeine, Claims and Cautions
Mushroom coffee is a drink that pairs coffee or a coffee-like base with mushroom extract. What the sources say about caffeine, claims, amounts and cautions, with no brands or rankings.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Before you start: three things worth knowing
- Caffeine may be in the cup. If a product contains coffee, it contains caffeine, and caffeine affects some people more than others. See side effects and who should be careful.
- A skin reaction has been reported. A 2026 dermatology report describes a whip-like rash linked to mushroom coffee as a new route to "shiitake dermatitis". [1] PubMed lists only the title of that report, so we cannot say more about the case.
- Some mushrooms carry their own cautions. Reishi and chaga both have case reports of harm, covered in mushroom tea and the safety pages linked below.
What "mushroom coffee" means
There is no single recipe. The sources we read do not define the term, so the label is the only reliable guide. Products described this way are drinks that include a medicinal or functional mushroom, usually as a powdered extract, and some also include coffee. Which mushroom, which part (fruiting body or mycelium), how it was extracted and how much is in a serving all change what a product contains. Mushroom ingredients explains those terms, and how to read a mushroom supplement label shows where to look.Caffeine: the one number you can usually estimate
Caffeine comes from the coffee, not the mushroom. For most adults the FDA has cited 400 milligrams a day, about two to three 12-fluid-ounce cups of coffee, as an amount not generally associated with negative effects. [2] The NHS lists about 100 mg in a cup of instant coffee and notes that filter and café coffee can contain more. [3] Decaf is not caffeine-free: the FDA gives 2 to 15 mg for an 8-fluid-ounce cup. [2]How much caffeine a mushroom coffee has depends on how much coffee is in it. Proper evidence not found: we searched PubMed and the regulator pages above and found no measured caffeine values for mushroom coffee products. Also, the FDA explains that caffeine must be listed in the ingredients when it is added on its own, but not when it comes from an ingredient that naturally contains it. [2] So a label may not state a caffeine number at all.
Which mushrooms, and what research says about them
Labels may name any of these. Each has its own guide.| Mushroom on a label | Scientific name | One thing to know |
|---|---|---|
| Lion's mane | Hericium erinaceus [4] | Study results depend on the form tested; see its guide |
| Reishi | Ganoderma lucidum [5] | A liver injury case report followed reishi powder with alcohol [6] |
| Chaga | Inonotus obliquus [7] | Kidney injury case reports with chaga powder (see mushroom tea) |
| Cordyceps | Cordyceps militaris [8] | Do not assume a result for one cordyceps species applies to another |
| Shiitake | Lentinula edodes [9] | Flagellate dermatitis is thought to be a reaction to lentinan, which heat breaks down [10] |
What research shows, kept to what we read:
| Question | What the source found | Strength of evidence |
|---|---|---|
| Does mushroom coffee as a product improve any health outcome? | Proper evidence not found. A PubMed search of titles and abstracts for "mushroom coffee" returned one item, the rash report above. | Insufficient evidence |
| Do fungal beta-glucans (a fiber found in mushroom cell walls) help health? | A review of 34 randomized trials reported inconsistent immune findings at the cellular and molecular level. [11] Amounts ranged from 2.5 to 1000 mg a day. [11] | Mixed; trials used supplements, not coffee |
| Does reishi help blood sugar or cholesterol? | A Cochrane review found trials did not support use for cardiovascular risk factors in people with type 2 diabetes. [12] | Insufficient evidence in that group |
| "Calm focus", "energy" or "immune support" from a cup | We found no trial of a mushroom coffee for these. | Marketing claim |
A trial of a capsule or powder cannot be carried over to a coffee, because the mushroom amount, extract type and caffeine all differ. For goal-by-goal summaries see mushrooms by wellness goal.
Frequently asked questions
Does mushroom coffee have caffeine?
If it is made with coffee, yes. Decaffeinated coffee still has some caffeine. [2] We found no measured values for mushroom coffee products, so read the label.
Is mushroom coffee healthier than regular coffee?
Proper evidence not found. We searched PubMed for trials of mushroom coffee and found none. [1] See mushroom coffee vs regular coffee.
Does mushroom coffee reduce anxiety or improve focus?
We found no trial of mushroom coffee for either. Any such statement on a label is a marketing claim unless a trial of that exact product supports it.
Can mushroom coffee cause a rash?
One 2026 dermatology report describes a flagellate (whip-like) rash linked to mushroom coffee. [1] Shiitake dermatitis is described as rare. [10] See a clinician for a new rash.
Is mushroom coffee approved by the FDA?
The FDA is not authorized to approve dietary supplements before they are sold. [13] We did not read a source that says how mushroom coffee is classified, so check the label.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How these products are regulated
Who should ask a clinician first
References
- Mijares J, Ramachandran V. Flagellate Erythema From Mushroom Coffee: A Novel Exposure Route for Shiitake Dermatitis. Int J Dermatol, 2026 (online ahead of print; PubMed lists a title only, no abstract). Read 2026-10-23.
- U.S. Food and Drug Administration. Spilling the Beans: How Much Caffeine Is Too Much? Consumer update, US. Read 2026-10-23.
- NHS (UK). Foods to avoid in pregnancy. Read 2026-10-23.
- Global Biodiversity Information Facility (GBIF), species match for Hericium erinaceus, usage key 5248508. GBIF species page. Read 2026-10-23 through the GBIF species-match service.
- Global Biodiversity Information Facility (GBIF), species match for Ganoderma lucidum, usage key 2549730. GBIF species page. Read 2026-10-23 through the GBIF species-match service.
- Guedikian R, et al. Ganoderma lingzhi (Reishi Mushroom)-Induced Acute Liver Injury in the Setting of Alcohol Use: A Case Report and Review of the Literature. Cureus, 2023. Read 2026-10-23.
- Global Biodiversity Information Facility (GBIF), species match for Inonotus obliquus, usage key 2521089. GBIF species page. Read 2026-10-23 through the GBIF species-match service.
- Global Biodiversity Information Facility (GBIF), species match for Cordyceps militaris, usage key 7567077. GBIF species page. Read 2026-10-23 through the GBIF species-match service.
- Global Biodiversity Information Facility (GBIF), species match for Lentinula edodes, usage key 2537743. GBIF species page. Read 2026-10-23 through the GBIF species-match service.
- Nette D, et al. Flagellate Dermatitis Induced by Shiitake Mushrooms: Clinical Features of a Rare but Characteristic Entity. Diagnostics (Basel), 2026. Read 2026-10-23.
- Vlassopoulou M, et al. Effects of fungal beta-glucans on health: a systematic review of randomized controlled trials. Food Funct, 2021. Read 2026-10-23.
- Klupp NL, et al. Ganoderma lucidum mushroom for the treatment of cardiovascular risk factors. Cochrane Database Syst Rev, 2015. Read 2026-10-23.
- U.S. Food and Drug Administration. Information for Consumers on Using Dietary Supplements. Read 2026-10-23.
- U.S. Food and Drug Administration. Questions and Answers on Dietary Supplements. Read 2026-10-23.