Mushroom supplement benefits and side effects: turkey tail, reishi, chaga and blends

Medicinal mushroom supplements are powders or extracts of fungi such as turkey tail, reishi, chaga, maitake, shiitake, cordyceps and lion's mane, sold mainly for immune support. Their main shared ingredient is beta-glucans, long sugar chains that immune cells can recognize ¹. Evidence in healthy people is early: single small studies of one mushroom at a time, such as more active immune cells and lower CRP (a blood marker of inflammation) after 4 weeks of eating dried shiitake ². Most side effects are mild, but there are rare reports of liver injury with reishi and agaricus, and kidney failure from chaga at several grams a day ⁶⁸⁹. LifeFrom's Mushroom Immune is a 14-mushroom mycelium blend whose label does not give the amount of each mushroom.

What are medicinal mushrooms?

Medicinal mushrooms have been used for hundreds of years in Asia, and more than 100 kinds are used there in cancer care alone ¹. For the basics, what it is and what it does in your body has its own page, and this guide covers mycelium vs fruiting body, the evidence, how much studies use, when and how to take them, side effects and interactions.

Mushroom Immune also contains poria, fomes, mesima, tremella, velvet foot (enoki's wild form) and zhu ling mycelia, each with little or no human research as a supplement.

Mycelium, fruiting body and mycelium on grain

A mushroom has two main parts. The fruiting body is what you see above ground or on the tree. The mycelium is the network of fine threads it grows from. Both contain beta-glucans and other compounds, but the amounts differ, and they swing widely with the strain, the growing material and the stage of growth ¹⁴.

Mycelium is cheaper and faster to grow, often on sterilized grain such as rice or oats, and some products grind the mycelium and the grain together. A 2025 lab study of chaga supplements found that products made this way were rich in starch, and lacked the marker compounds (such as inotodiol and melanin) found in real chaga canker from birch trees ³.

What medicinal mushrooms are good for: the evidence, graded

Each use below gets a grade. Strong means several good randomized trials or a meta-analysis agree; Moderate means several randomized trials, mostly positive but small or short; Limited means few or small trials, or mixed results; Early means lab, animal or a single pilot study only; Not supported means good trials found no benefit. Our guide to how to read supplement evidence explains why a food study of one mushroom says little about a capsule blend.

The table has no row for a blend like Mushroom Immune because there is nothing to grade: we found no published trial of a 14-mushroom mycelium blend. Every row is about single mushrooms or a two-mushroom mix, in amounts far larger than a blend capsule holds.

What do mushroom supplements do for the immune system?

The clearest human study is a food study. Fifty-two healthy adults aged 21 to 41 ate 5 or 10 g of whole dried shiitake every day for 4 weeks ². Afterwards, two types of immune cells (gamma-delta T cells and natural killer T cells) multiplied about 60% and 2-fold more readily in the lab, salivary IgA (an antibody that guards the lining of the mouth and gut) rose, and CRP fell ². There was no placebo group, both groups ate shiitake, and the outcomes were lab measurements, not fewer infections.

Shop pages, ours included, describe mushroom blends as supporting the normal work of immune cells. That is a structure/function statement. It is not a claim that a mushroom supplement prevents, shortens or treats any infection, and no blend has been tested for that.

What benefits does turkey tail mushroom have?

Turkey tail grows on dead logs worldwide and is named for its brown and tan rings ¹. Its best-known compound, polysaccharide K (PSK), is an approved product in Japan used alongside surgery and chemotherapy, and a 2007 analysis of 8 randomized trials in 8,009 people having surgery for stomach cancer found longer survival when PSK was added to chemotherapy ¹. In the US, a phase 1 trial (an early safety study) gave women who had finished breast cancer treatment 3, 6 or 9 g a day of a turkey tail preparation for 6 weeks; it was well tolerated, with trends toward more lymphocytes and natural killer cell activity ¹⁵.

The FDA has not approved turkey tail or PSK as a treatment for cancer or any other medical condition ¹. Cancer is diagnosed and treated by an oncology team; a mushroom supplement is not a cancer treatment and is never a swap for one.

Nevertheless, the evidence is inconclusive to recommend the routine use of mushrooms for cancer patients.Narayanan S and colleagues, systematic review of medicinal mushroom supplements in cancer, Current Oncology Reports, 2023 ¹⁶

Reishi: what the research shows

Reishi (lingzhi) is a large, reddish-brown, fan-shaped mushroom that grows on living trees and has been used in East Asia for centuries to promote long life and energy ¹⁸. Human research on reishi alone is thin and mostly in people with cancer ¹. Its mix with lion's mane lowered anxiety scores more than lion's mane alone in one 2026 trial of young women, though not clearly more than placebo, a single result for a specific product ⁴. Reishi is the mushroom in this group with the longest list of cautions: liver injury reports, bleeding, and immune-suppressing medicines ⁸¹¹.

How much do studies use?

There is no recommended intake and no official upper limit for any of these mushrooms. The amounts below are what studies gave or what case reports describe, as history, not a dose for anyone reading.

One Mushroom Immune capsule holds a 525 mg proprietary blend of 14 mushroom mycelia. The label does not give the amount of each. Split evenly, that would be about 37 mg of each mushroom; the split could also be very uneven. Either way, it is a small fraction of the grams used in the single-mushroom studies above ²¹⁵.

For chaga, the arithmetic is reassuring, with one unknown. The chaga powder in the Korean kidney case held about 0.14 g of oxalate per gram ⁹. Even if a whole 525 mg capsule were that powder, it would hold about 74 mg of oxalate; at an even split, about 5 mg. Typical diets contain 200 to 300 mg of oxalate a day ⁹. The oxalate content of chaga mycelium, as opposed to the canker, is not known.

When and how to take mushroom supplements

No study tested timing or meals with a mushroom capsule; the shiitake study used mushrooms as food ². One reported case of acute liver injury followed reishi powder taken together with alcohol, in a 47-year-old man who recovered within two weeks ⁷, which is a reason to keep heavy drinking and reishi apart.

How long does a mushroom supplement take to work? The human studies measured changes after 4 to 6 weeks ²¹⁵. Most people will not feel a difference, and no study has tested how long a blend like Mushroom Immune might take, because no study has tested it at all.

Mushroom supplement side effects

In studies of mushroom supplements in cancer care, most side effects were mild (grade 2 or lower), mainly nausea, vomiting, diarrhea and muscle pain ¹⁶. Reishi can cause nausea and insomnia, and has also been linked to dry mouth, constipation, itching and dizziness ¹¹. Maitake was associated with a raised white blood cell count and a symptom-free rise in eosinophils (a type of white blood cell) ¹². The serious problems are rare and specific to certain mushrooms.

Who should avoid mushroom supplements or ask first

• Pregnancy and breastfeeding: there are no safety studies for these supplements in pregnancy or breastfeeding, so this is one to raise with your obstetric clinician or midwife.
• Children: no studies; ask a pediatrician.
• Mushroom or mold allergy: avoid them.
• Kidney disease or kidney stones: chaga's oxalate is the concern ⁹¹⁰; ask your kidney clinician first.
• Liver disease or heavy drinking: reishi and agaricus have rare liver injury reports ⁶⁷⁸.
• Autoimmune disease or a transplant: reishi can enhance the immune response and may not be safe with immune-suppressing medicines ¹¹.
• Myeloid blood cancers: Memorial Sloan Kettering advises against cordyceps, which Mushroom Immune contains ¹³.
• Cancer treatment: mushrooms are popular during cancer care, but reishi may interact with some chemotherapy in theory and agaricus has caused severe liver injury in patients ⁶¹¹; clear any mushroom with the oncology team.
• Bleeding disorders, surgery or dental work: reishi, maitake and cordyceps may raise bleeding risk ¹¹¹²¹³.
• Diabetes: maitake and cordyceps may lower blood sugar ¹²¹³; ask your clinician and keep checking your blood sugar as you usually do. Shakiness, sweating, confusion or a pounding heartbeat on diabetes medicine can be low blood sugar and needs prompt care.

Mushroom supplement interactions

Supplements to pair or keep apart

Blood tests worth knowing about

No blood test measures a mushroom supplement or shows whether it is working. The markers below are the ones a mushroom could move in a study, the safety checks that matter for the rare liver and kidney problems, and the tests a mushroom can interfere with.

A raised ALT, a high creatinine or falling eGFR, an INR out of range or an abnormal blood count goes to your clinician first, not to a supplement. If you have chronic kidney disease or fatty liver disease, a mushroom supplement is not a treatment for either, and those conditions are reasons to ask before taking one.

Mushroom Immune in the LifeFrom pouch

One capsule holds 525 mg shared across 14 mushrooms with no per-mushroom amounts on the label, so every mushroom is present at far less than the grams used in the single-mushroom studies, and the exact amount of chaga, reishi or agaricus cannot be known from the label ²¹⁵. The blend contains cordyceps and lion's mane, which LifeFrom also sells as separate capsules, and everything in a pouch is taken at once, so a pouch with Mushroom Immune plus Cordyceps doubles the cordyceps cautions. You can see the shop and its packs.

This guide is general education, not medical advice. Supplements, mushroom blends included, are not FDA-approved for safety or effectiveness, and the clinician who knows your history and medicines is the right person to decide whether a mushroom supplement makes sense for you. For more on how we write about health, see our medical disclaimer.

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