Reishi for Skin: What the Research Shows (and Doesn't)

Is reishi good for your skin? On your skin, possibly a little. In a capsule, nobody knows. The research on reishi and skin comes almost entirely from cells, animals and a few cosmetic tests of creams or gels. We found no randomised human trial in which swallowing reishi improved any skin outcome. So if you want reishi for skin, a well-made topical product is the evidence-matched choice, and a capsule is a hope rather than a plan.

This guide looks at reishi specifically. For the wider picture across mushrooms, including tremella and chaga, see our roundup of the best mushrooms for skin.

Does Taking Reishi Improve Your Skin?

There's no evidence that it does. We searched for randomised trials in which people swallowed reishi and researchers measured wrinkles, hydration, acne, pigmentation or any other skin outcome. We didn't find one.

That's not proof that oral reishi does nothing for skin. It means nobody has properly tested it. The claims you'll see on supplement pages, about collagen, glow or anti-aging, come from lab work, traditional use or general antioxidant reasoning, not from skin trials.

Why is the gap so large? Partly because skin trials are expensive and slow. Partly because supplements don't need to prove skin claims in the way cosmetics need to show safety. And partly because the mechanism is a stretch: compounds swallowed in a capsule have to survive digestion, enter the blood and reach the skin in meaningful amounts.

What Does the Lab Research Show?

Some interesting results, all short of human proof. Here are the studies most often quoted.

Aging skin cells and wound healing

In a 2026 study, a reishi extract improved the survival of aged human skin cells called fibroblasts in the lab. At 100 micrograms per millilitre, it raised a marker of mitochondrial health and lowered reactive oxygen species. In injured animals, a gel with 2% reishi extract helped wounds heal (Tao 2026). The work was partly carried out by a company research centre, which is worth knowing.

Pigmentation and redness

A Taiwanese team tested beta-glucan-rich polysaccharides made from reishi mycelium. In skin pigment cells, they inhibited the enzyme tyrosinase by 32.4% and cut melanin production by 30.6%. In small human tests of the polysaccharides on skin, the authors reported no irritation, less redness, better hydration and fewer visible wrinkles, and up to 48% less redness after a heat patch (Huang 2026).

Note the details. These were purified mycelium polysaccharides, not reishi capsules, and they were applied to the skin. The abstract doesn't give the size or design of the human tests, so we can't judge how strong that part is.

Oily skin and the 5-alpha-reductase claim

In 2005, Japanese researchers screened mushroom extracts for their effect on 5-alpha-reductase. This enzyme converts testosterone into a stronger hormone linked to oily skin, acne and hair loss. Reishi showed the strongest inhibition of the mushrooms tested, and it reduced hormone-driven prostate growth in rats (Fujita 2005).

That study is often quoted on reishi pages for acne or hair. But it measured enzyme activity in the lab and prostate size in rats, not skin or hair in people. It's a reason for research, not a reason to expect clearer skin.

Is Topical Reishi Worth Trying?

Possibly, with modest expectations. Reishi extract appears in many Asian skincare products, usually in serums, essences and creams. If the lab and small human results hold up, the most likely benefits are soothing, hydration and a gentle antioxidant effect.

How to choose and use one:

• Look for the Latin name, Ganoderma lucidum or Ganoderma lingzhi, in the ingredient list.
• Check where it sits. Ingredients are listed in descending order. If reishi is near the end, there's very little of it.
• Patch-test first. Apply a small amount to the inner arm for two or three days before using it on your face.
• Keep your basics. Daily sunscreen, a moisturiser and, if suitable, a retinoid have far more evidence for skin aging than any mushroom.

If hydration is your main goal, tremella, the snow mushroom, has more direct topical evidence than reishi. Our article on tremella and skin hydration covers it.

Can Reishi Cause Skin Problems?

Yes, occasionally. Memorial Sloan Kettering's clinical monograph lists itching among reishi's reported adverse reactions, alongside nausea, insomnia, dry mouth, constipation and vertigo (MSKCC). These reactions are uncommon, but itchy skin is an awkward side effect for something taken to improve your skin, so it's worth knowing about.

Reishi spore powder and spore oil are concentrated products, and some people react to them differently from fruiting-body extracts. Any mushroom can also trigger an allergy in a sensitive person. Stop at once if you develop hives, swelling of the lips or face, or difficulty breathing, and seek urgent care.

Shiitake is a useful warning here. A 2017 review collected 50 cases of shiitake dermatitis, an itchy, whip-like rash, mostly after eating raw or undercooked shiitake. Reishi doesn't cause that particular reaction, but it's a reminder that mushrooms can affect skin in both directions. Our guide to reishi side effects and interactions covers the rest.

Why Is Reishi Marketed for Skin at All?

Mostly because of its reputation, not its skin research. Reishi has a long history in Chinese and Japanese traditional medicine as a general tonic, and "longevity" claims transfer easily to "youthful skin". It also contains triterpenes and polysaccharides with antioxidant activity in lab tests, and antioxidants are a popular selling point in skincare.

Antioxidant activity in a test tube is a weak predictor of anything in the body, though. Many common foods and plant extracts show strong antioxidant activity in the lab without proven skin effects when eaten. Topical use is a slightly better bet, because the ingredient is placed where it's needed, but it still depends on the formulation, the concentration and whether the ingredient penetrates.

There's also a cultural factor. In East Asian skincare, mushroom extracts are a familiar category, and reishi sits alongside ginseng and green tea as a traditional "premium" ingredient. That makes it attractive for marketing, independent of how much of it is in the bottle.

None of that means reishi is useless for skin. It means the reasons it's sold for skin are older and broader than the evidence, and you should weigh the claims accordingly.

Should You Take Reishi Capsules for Your Skin?

Not for your skin alone. If you already take reishi for sleep or stress and you notice your skin looks better, that's fine, though better sleep and less stress might explain it. But it's hard to justify buying reishi capsules specifically for skin when no trial supports it.

If you do take reishi, follow the usual cautions. It may affect blood clotting and blood sugar, so check with your doctor if you take blood thinners or diabetes medicine. Rare liver reactions have been reported. Our reishi dosage guide covers the amounts used in human studies.

What Actually Helps Skin?

The evidence-based basics are less exciting but far better supported:

• Daily broad-spectrum sunscreen, the most effective anti-aging step there is.
• A moisturiser suited to your skin type.
• Retinoids, under advice if you're new to them.
• Not smoking.
• Enough sleep, and treatment for skin conditions from a dermatologist when needed.

A reishi serum can sit alongside these. It can't replace them.

Frequently Asked Questions

Does reishi help with acne?

There's no human evidence. A lab and rat study found reishi inhibits 5-alpha-reductase, an enzyme linked to oily skin, but nobody has tested reishi on acne in people. Proven acne treatments, from a pharmacist or dermatologist, are a much better bet.

Is reishi good for wrinkles?

Topical reishi polysaccharides reduced visible wrinkles in small human tests reported in a 2026 study, but the details are limited. No trial shows that taking reishi orally reduces wrinkles. Sunscreen and retinoids have much stronger evidence.

Can I put reishi powder on my face?

We wouldn't. Kitchen powder isn't formulated for skin, can harbour microbes and may irritate. If you want reishi on your skin, use a finished cosmetic product and patch-test it first.

How long does reishi take to work on skin?

For oral reishi, there's no evidence of an effect to time. For topical products, give any new skincare at least four to eight weeks, which is roughly how long it takes the skin's outer layer to renew a couple of times.

Can reishi make your skin itch?

Occasionally, yes. Itching is listed among reishi's reported adverse reactions. Stop taking it if itching or a rash appears, and seek urgent help if you have swelling or breathing difficulty.

Related Articles

• Best Mushrooms for Skin
• Tremella and Skin Hydration
• Chaga for Skin Health
• Reishi Side Effects and Interactions
• How to Read a Reishi Label

Sources

1. Tao L, Tai M, Zhou Z, et al. A Ganoderma lucidum extract improves mitochondrial function in aging skin and promotes wound healing. Clin Cosmet Investig Dermatol. 2026;19:596475. PubMed 42088112
2. Huang CF, Chang JF, Yang HS, Hsu CP, Lin CC. In vitro and in vivo evaluation of the skincare bioactivity of β-1,3;1,6-glucans-rich Ganoderma lucidum polysaccharides. Molecules. 2026;31(10):1740. PubMed 42197294
3. Fujita R, Liu J, Shimizu K, et al. Anti-androgenic activities of Ganoderma lucidum. J Ethnopharmacol. 2005;102(1):107-112. PubMed 16029938
4. Nguyen AH, Gonzaga MI, Lim VM, Adler MJ, Mitkov MV, Cappel MA. Clinical features of shiitake dermatitis: a systematic review. Int J Dermatol. 2017;56(6):610-616. PubMed 28054338
5. Memorial Sloan Kettering Cancer Center. Reishi mushroom: Integrative Medicine herb monograph. mskcc.org