Is Host Defense Legit? Refunds, Price, Ingredients and Evidence

Host Defense is a line of mushroom supplements that describes itself as the supplement line of Fungi Perfecti, LLC, and its site footer names Paul E. Stamets and Fungi Perfecti, LLC. The brand publishes a phone number and an email address, and its refund policy does not accept returns for products delivered more than 90 days before the return request. It shows label panels on its product pages, but the Lion’s Mane panel on this page is incomplete, so read the full panel on the bottle. Its products are sold on its own website and on Amazon. Because Host Defense sells mushroom supplement products, this page reads as a mushroom product page: it covers what the brand says, what each label lists, what independent sources say about those mushrooms, and what you pay and how refunds work.

Independence note: This site has no commercial relationship with Host Defense and is not paid by it. It has no business relationship with this brand, receives nothing from it, and has no purchase or affiliate links on this page.

At a glance

Who makes Host Defense and how to reach them

Host Defense describes itself as the supplement line of Fungi Perfecti, and its site footer reads “© 2026, Paul E. Stamets and Fungi Perfecti, LLC”. The company lists these ways to get in touch.

What Host Defense says its products do

Host Defense sells capsules, powders, liquid extracts and a spray. A trade publication, Nutraceutical Business Review, reports a company statement that the brand also launched gummies, starting with Lion’s Mane and Stamets 7 formulas. The product pages make these claims, quoted as the brand’s own wording.

Each product page carries the brand’s footnote that its statements “have not been evaluated by the Food and Drug Administration” and that the products are not intended to diagnose or treat any disease. Packaging images also carry the brand’s line “#1 best selling mushroom brand in the U.S.”, which is the company’s own claim, and the packaging does not name a source for that ranking.

What is in the capsules

Host Defense says it grows its mycelium on organic brown rice and that the fermented rice stays in the final product. The Reishi and Turkey Tail labels read “mycelium/fermented brown rice biomass”. The brand also says it does not isolate or concentrate compounds in its powders. Host Defense says it does not print beta-glucan figures on its labels because it considers current testing methods unreliable (brand blog). The MyCommunity panel lists 17 species, per serving of 2 capsules. Each line reads “mycelium/rice biomass” on the label.

The label lists other ingredients as pullulan (capsule), and it marks the organic ingredients as certified organic. The MyCommunity label shows a serving size of 2 capsules and 30 servings per 60-capsule bottle. The Reishi and Turkey Tail panels each show 1g per serving of 2 capsules. The Lion’s Mane panel shows 1g of Lion’s Mane mycelium/fermented brown rice, so check the serving size on your bottle. The brand’s FAQ gives a suggested daily amount of 2 capsules or 1 gram, or 2 mL of liquid extract split into two doses. It says the extracts contain 30 to 40 percent alcohol and that the powders are suggested at half a teaspoon one to three times a day.

For a deeper look at how mycelium-based products are described, see our Host Defense Mushrooms Guide: Ingredients, Price & Safety. For the broader question of how brands describe ingredient evidence, read Ingredient Evidence vs. Marketing Claims.

What the research says about the main ingredients

The National Center for Complementary and Integrative Health says evidence for dietary supplements varies widely, with some showing benefit and others little or none, and that products sold in stores or online may differ from the products tested in studies.

Lion’s Mane

Host Defense says its Lion’s Mane capsules promote focus and memory, and its footnote ties the clinical claim to a study that combined the mushroom with diet and exercise. Fungi Perfecti’s ingredient page for Lion’s Mane (fungi.com) says the research used 2 grams per day alongside other lifestyle changes, but it does not name that study. The Memorial Sloan Kettering lion’s mane summary describes limited clinical data suggesting possible benefits for memory and mood in overweight adults, mild cognitive impairment, cognitive function in older adults, mild Alzheimer’s disease, and mood in menopausal women. It reports subjective stress reduction in younger adults, and it notes that in one study supplementation had no effect on cognition. The summary does not list doses or study lengths for these trials, so the 2-gram figure comes from Fungi Perfecti’s ingredient page rather than from the summary. Most of the laboratory findings it describes come from animal and cell studies. For more on the cognitive research, see Mushrooms and Cognitive Health: Neuroprotection Research Across Species.

Reishi

Host Defense lists “Promotes cardiovascular health” for its Reishi capsules. The Memorial Sloan Kettering reishi summary reports clinical studies that found improvements in lower urinary tract symptoms in men, mild antidiabetic effects, and lower anxiety. It also notes that randomized trials did not support reducing cardiovascular risk factors in people with type 2 diabetes, which is the finding to weigh against the brand’s heart wording. A pilot study of reishi spore powder did not find it helpful for Alzheimer’s disease.

Turkey Tail

Turkey tail, also called coriolus, is the source of PSK, an extract Japan has approved as an add-on cancer treatment. The National Cancer Institute’s medicinal mushrooms summary describes studies of PSK in people with several cancers. The Memorial Sloan Kettering coriolus summary notes that the US Food and Drug Administration has not approved coriolus extracts as cancer treatments, and that many over-the-counter coriolus products are not standardized, which makes potency hard to compare between brands. PSK is a proprietary product, so the Turkey Tail capsules sold as supplements are a different product from PSK. Host Defense’s blog cites a 2019 NIH-funded study that it says confirmed immune activity of its Turkey Tail mycelium capsules, but the blog describes that study only in general terms.

Cordyceps

MyCommunity includes Cordyceps militaris at 100mg per serving, and the brand says Cordyceps “supports energy & stamina”. The Memorial Sloan Kettering cordyceps summary covers Cordyceps sinensis, a different species from the militaris on the label, so its findings do not transfer directly. That summary says studies of exercise performance in healthy people gave mixed results.

Does Host Defense support immune function?

Short answer: Host Defense says its products support immune function, but the independent sources below study mushrooms and immune health in general, not these products. Host Defense says MyCommunity offers “comprehensive immune support” and that its mushrooms “encourage a healthy and balanced immune response”. Harvard Health notes that so far there is no evidence that herbs or supplements like these bolster immunity to the point where you are better protected against infection and disease. It also says that boosting the number of immune cells is not necessarily a good thing. For what independent guidance suggests instead, the CDC’s immunity page lists six habits: eat well, be physically active, maintain a healthy weight, get enough sleep, do not smoke, and avoid excess alcohol. The CDC also says to talk to your health care provider if you think you need nutritional supplements. Neither source describes a fast way to boost immunity.

Side effects and who should check with a clinician

Is there a downside to taking lion’s mane? The Memorial Sloan Kettering summary reports abdominal discomfort, nausea and skin rash from one clinical study, and it does not say how often these happen. If you have felt something like that after taking lion’s mane, those are the effects the independent summary names, and it does not say what caused any particular person’s symptoms. If it continues, your clinician is the right person to ask, and it helps to tell them every supplement you take. For context on how adverse events are reported in studies, see Clinical Study Safety Data.

Host Defense’s own FAQ says there is not enough research to conclude that its mushroom supplements are safe during pregnancy or for children, so the company does not suggest them for those groups. The FAQ also says that if you are having surgery, have a medical condition, or take prescription drugs including blood thinners or insulin, you should consult your health practitioner before taking the products. The NCCIH guidance on using supplements wisely adds that supplements may interact with medicines or pose risks if you have certain medical problems.

Testing and heavy metals

Host Defense’s 2021 article “Why All Host Defense Supplements Are Powered by Mushroom Mycelium” says products are verified for identity, purity, composition and strength by independent labs, and that the company tests for pesticides, heavy metals and microbiological contaminants. The brand’s FAQ says its testing focuses on identity, composition, purity and strength rather than nutritional, mineral or other analyses.

A September 2025 article by Lead Safe Mama, a small business that runs community-funded lab testing, reports that a Host Defense MyCommunity supplement powder tested positive for traces of lead, cadmium and arsenic. The article says its results apply only to the product tested and links the full lab report at the bottom. The same site says some of its Amazon links are affiliate links, and its author argues that no level of lead exposure is safe. The article tested a MyCommunity powder only. The brand’s FAQ says its powders and capsules use the same mycelium powder, but the article did not test the capsules, so ask the company for lot-level third-party results for the capsules you are considering.

Prices, Amazon ratings and the discount code

Prices as of October 6, 2026 on the brand’s product pages and October 7, 2026 on the Amazon listing. Check checkout for today’s price, because prices and bundles change. Shipping is calculated at checkout on the brand’s site.

These are the Amazon listing’s own figures. The star rating and review count reflect what reviewers posted there, and the monthly sales number is Amazon’s estimate. Neither is a verdict on quality. The 30-capsule Lion’s Mane listing on Amazon is $15.71 as of October 7, 2026, while the brand’s 30-capsule Lion’s Mane price is $20.95 as of October 6, 2026, so compare both before you buy.

The brand’s own pages display these review figures as of October 6, 2026: Lion’s Mane 4.9 stars from 45 reviews, Reishi 5 stars from 12, Turkey Tail 5 stars from 17, and MyCommunity 5 stars from 9.

Is there a Host Defense discount code? The brand’s pages show a “Get 20% off” banner, and product pages say “Select a larger size to Subscribe and Save 20%!”, but no discount code appears on them. Check checkout for current offers, and read the brand’s subscription policy before you subscribe.

Refunds, returns and the 90-day guarantee

The brand’s refund policy refers to a 90-day satisfaction guarantee on a separate page, and the full terms of that guarantee are on that page, which this page does not cover. The policy says returns are not accepted for products delivered more than 90 days before the return request.

Before you order

• Confirm today’s price, bottle size and any subscription terms at checkout.
• Read the brand’s subscription policy and refund terms before you subscribe.
• Ask the company for third-party test results for the lot you are buying.
• Read the serving size on your bottle and compare it with the suggested amount.
• If you are pregnant, nursing, buying for a child, or taking prescription medicines, ask your clinician first, as the brand itself advises.

How to check Host Defense’s claims yourself

Start with the supplement facts panel on the bottle, which lists each ingredient and its amount. Ask the company for third-party test results for the lot you are buying, and compare the brand’s benefit wording with the Memorial Sloan Kettering summaries linked above for each ingredient. For the public rules that govern supplement labels and advertising, check the Food and Drug Administration’s dietary supplement pages and the Federal Trade Commission’s advertising guidance. Read the claims against the studies rather than the marketing alone.

By MushroomHealthBenefits.com Research & Editorial Team

This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.

Further reading

• Host Defense Mushrooms Guide: Ingredients, Price & Safety
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• Plant People Mushroom Gummies: Ingredients, Price & Safety Guide