Mushrooms in skincare have gone from a niche ingredient to a trend ingredient over the past few years, riding the same wave of interest in adaptogens and fungi that has driven the functional mushroom supplement market. Unlike some wellness trends, the skincare claims for specific mushroom species are reasonably well grounded in research, at least for some of them.
The key is knowing which mushroom, which extract, and what the evidence actually supports, rather than assuming that all mushroom-related marketing is equivalent.
What makes fungi interesting for skincare
Fungi produce a remarkable array of bioactive compounds: beta-glucans (complex polysaccharides), triterpenes, ergosterol, various polyphenols, enzymes, and adaptogenic compounds. Many of these have antioxidant, anti-inflammatory, immunomodulatory, and skin-barrier supporting properties that have been studied both in isolation and in whole-mushroom extracts.
The diversity of compounds is both the reason fungi are interesting and the reason “mushroom extract” on a label is not a sufficient description of what you’re getting. Extracts from different species, different parts (mycelium vs fruiting body), different extraction methods (water, alcohol, CO2), and different growing conditions produce dramatically different compound profiles.
Reishi (Ganoderma lucidum)
Reishi is one of the most studied medicinal mushrooms in the world, with centuries of use in traditional Chinese and Korean medicine. Its primary bioactive compounds include beta-glucans, triterpenes (particularly ganoderic acids), and polysaccharides.
For skin, the most relevant properties: anti-inflammatory activity (triterpenes inhibit histamine release and pro-inflammatory cytokines), antioxidant capacity (the polyphenol content scavenges free radicals), and anti-aging potential through inhibition of matrix metalloproteinases (the enzymes that break down collagen). A 2013 study demonstrated that Ganoderma lucidum extract inhibited collagen-degrading MMPs in cell culture, suggesting potential for reducing collagen breakdown.
Beta-glucans in reishi (and other medicinal mushrooms) have skin-conditioning and barrier-supporting properties. Beta-glucans bind to receptors on skin cells and can modulate immune responses, reducing inflammatory reactions. They also have water-binding properties that contribute to skin hydration.
Reishi extract appears in serums and moisturisers, typically for its anti-aging and anti-inflammatory positioning. The clinical evidence for topical reishi specifically is limited (most reishi research focuses on oral supplementation), but the in vitro and mechanistic evidence is reasonable.
Chaga (Inonotus obliquus)
Chaga is a parasitic fungus that grows primarily on birch trees in northern Europe, Siberia, and parts of North America. It has been used in Russian and Nordic folk medicine for centuries, which makes it particularly relevant in an Estonian context: birch trees and chaga are part of the same landscape that characterises the Baltic region.
Chaga has an exceptionally high antioxidant capacity, consistently ranking among the highest of any natural food or ingredient in ORAC (oxygen radical absorbance capacity) testing. Its primary antioxidant compounds include melanin (from the dense black outer layer), betulinic acid (absorbed from the host birch tree), polyphenols, and a variety of triterpenes.
Betulinic acid from chaga has been independently studied and shows anti-inflammatory and wound-healing properties in several research models. The birch-derived betulin in chaga’s composition creates an interesting link: the same tree that has been used in Estonian skincare traditions for centuries contributes compounds to the fungi that parasitises it.
For skin, chaga is positioned primarily for its antioxidant and anti-inflammatory effects, making it relevant for anti-aging and for sensitised or reactive skin. Its melanin content also means it may offer mild UV-absorbing properties, though this is not a substitute for SPF.
Tremella (Tremella fuciformis)
Tremella, sometimes called snow mushroom or silver ear mushroom, produces polysaccharides with exceptional water-holding capacity, estimated to hold up to 500 times their weight in water, comparable to hyaluronic acid. Tremella polysaccharides have smaller molecular weights than large hyaluronic acid molecules and may penetrate slightly better.
Several studies have compared tremella polysaccharides to hyaluronic acid for skin hydration and found comparable results. A 2021 study found tremella polysaccharides produced equivalent improvements in skin hydration, smoothness, and elasticity to hyaluronic acid in a four-week clinical trial.
Tremella is one of the more convincing skincare mushroom ingredients because of this direct comparison research. It’s positioned as a natural alternative to synthetic hyaluronic acid and has the evidence to support this positioning reasonably well.
Snow algae and shiitake
Shiitake (Lentinus edodes) contains kojic acid, a natural tyrosinase inhibitor that reduces melanin production and fades hyperpigmentation. This is a functional, evidence-based benefit that makes shiitake extract relevant for brightening products. Kojic acid from any source (including synthetic production) works the same way, but naturally-occurring kojic acid from shiitake is a meaningful functional ingredient.
Cordyceps, lion’s mane, and several other medicinal mushrooms are increasingly appearing in skincare. The research for these species in topical skin applications specifically is thin. The oral health research for some of them (lion’s mane for cognitive function, cordyceps for athletic performance) doesn’t automatically translate to skin benefits from topical application.
What to look for when buying mushroom skincare
Species specificity: a product that names Ganoderma lucidum, Inonotus obliquus, or Tremella fuciformis is providing more useful information than one that just says “mushroom extract.”
Fruiting body versus mycelium: the fruiting body (the actual mushroom) generally contains higher concentrations of the active compounds (beta-glucans, triterpenes) than the mycelium (the root-like structure). Some cheaper supplements and extracts use mycelium grown on grain rather than the fruiting body; the compound profile is different and generally less potent.
Extraction method: water extraction pulls polysaccharides efficiently; alcohol extraction pulls triterpenes; dual extraction gets both. For the full spectrum of each mushroom’s activity, dual-extracted whole mushroom extracts are more comprehensive.
Mushroom skincare is one of the more legitimately interesting trend ingredients in recent years. The research foundation is real for several key species, and the compounds involved are bioactively relevant to skin health in specific, documentable ways.