Ceraceomyces Tessulatus Mycelium Extract: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 24, 2025
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All information on this page is verified using The Personal Care Products Council's (PCPC) INCI database. Our ingredient analyses are based exclusively on PCPC's technical data to ensure accuracy and reliability.

What Is Ceraceomyces Tessulatus Mycelium Extract?

Ceraceomyces Tessulatus Mycelium Extract comes from the mycelium, or root-like threads, of the Ceraceomyces tessulatus mushroom. While this mushroom is not a household name, its underground network is naturally rich in polysaccharides, amino acids and protective phenolic compounds that help the organism survive in harsh environments. Inspired by traditional use of mushroom preparations for skin soothing in East Asia, formulators began studying the species in the early 2000s for its antioxidant potential. The ingredient is produced by growing the mycelium in a controlled nutrient broth, harvesting it at peak activity then gently extracting the water-soluble fractions through filtration and low-heat concentration. The resulting liquid or powdered extract finds its way into hydrating serums, daily moisturizers, overnight masks, anti-aging creams and after-sun treatments where a light yet effective boost of moisture and protection is desired.

Ceraceomyces Tessulatus Mycelium Extract’s Cosmetic Benefits/Uses

This extract brings two key actions to skin care formulas

  • Antioxidant – the phenolic and flavonoid components help neutralize free radicals created by UV exposure and pollution which can otherwise lead to dullness and early signs of aging. By limiting oxidative stress the extract supports a brighter more even-toned complexion and helps preserve the stability of other sensitive ingredients in the product
  • Humectant – its natural sugars attract and bind water to the skin surface creating a lightweight moisture film that improves softness and plumps fine lines without a greasy feel. This extra hydration can enhance the skin barrier and improve the spreadability of the overall formula

Who Can Use Ceraceomyces Tessulatus Mycelium Extract

This mushroom-derived humectant suits most skin types. Dry or combination skin often appreciates the extra hydration while sensitive skin usually tolerates it because it is free of common irritants like fragrance and alcohol. Oily and acne-prone users can also benefit since the extract is lightweight and non-greasy, though those extremely prone to fungal acne may prefer to introduce it slowly and see how their skin responds.

The material is obtained from a cultivated fungus without animal derivatives so it is considered vegan and vegetarian friendly. No beeswax, dairy proteins or other animal inputs are used during the growth or extraction steps.

There are no specific warnings for pregnant or breastfeeding women, yet research on this exact extract is limited. This content is not medical advice. Anyone who is pregnant or nursing should show the full ingredient list of any product to their doctor before use just to be safe.

The extract has no known link to photosensitivity, meaning it does not make skin more prone to sunburn. Normal daytime sun protection practices are still recommended.

Potential Side Effects/Adverse Reactions

Responses to topical Ceraceomyces Tessulatus Mycelium Extract vary from person to person. The effects listed below are possible but uncommon if the ingredient is used at standard cosmetic levels in a well-formulated product.

  • Mild redness or warmth on application
  • Temporary itching or stinging, especially on broken or very dry skin
  • Allergic contact dermatitis in individuals sensitive to mushroom proteins
  • Rare clogged pores or fungal acne flare in those highly prone to Malassezia issues
  • Interaction with strong exfoliating acids or retinoids leading to added dryness in very reactive skin

If any persistent irritation, rash or discomfort occurs stop using the product and consult a healthcare professional or dermatologist.

Comedogenic Rating

Rating: 1/5 Ceraceomyces Tessulatus Mycelium Extract is water based and contains mostly low-molecular-weight sugars and phenolic compounds rather than heavy oils or waxes that tend to block pores. Most formulations use it at modest concentrations, so the overall risk of pore clogging is minimal. A handful of users who are extremely sensitive to fungal triggers might still experience congestion, which is why the rating is not a perfect zero.

Overall it is considered suitable for acne-prone or breakout-prone skin, especially when used in lightweight serums, gels or oil-free moisturizers.

Products that pair this extract with rich butters or high comedogenic oils could raise the pore-clogging potential, so the full ingredient list matters more than the extract itself.

Summary

Ceraceomyces Tessulatus Mycelium Extract acts as an antioxidant and a humectant. Its phenolic content mops up free radicals from UV exposure and pollution while its natural sugars latch onto water, boosting surface hydration and softening fine lines. Together these actions help maintain a brighter, more supple complexion and support the stability of other delicate ingredients in a formula.

Despite mushroom extracts gaining traction in wellness circles, this particular species is still a niche player compared with heavyweight actives like niacinamide or hyaluronic acid. Brands that lean into botanical innovation are slowly adding it to hydrating serums and soothing creams so you may see it pop up more often in the coming years.

The ingredient carries a low risk profile, with rare reports of irritation or pore blockage when used at normal cosmetic levels. As with any new skincare addition it is wise to perform a small patch test before full-face application to ensure your skin agrees with it.

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