What Is Cyathusal C?
Cyathusal C is a plant-derived compound found in the waxy outer layers of the Cyathus mushroom, a small cup-shaped fungus native to temperate forests in Asia. Chemically it belongs to the family of polyphenols, a group known for strong antioxidant activity. Beauty formulators first became interested in the molecule in the late 2000s after studies on traditional herbal preparations highlighted its ability to protect skin from environmental stress.
To obtain cosmetic-grade Cyathusal C, harvested mushrooms are dried and milled, then steeped in a food-grade alcohol that draws out the active polyphenols. The extract is filtered, the solvent is removed under gentle heat, and the concentrated material is standardized so every batch offers the same potency. Some suppliers further microencapsulate the ingredient to help it stay fresh in water-based creams.
Because of its stability and gentle nature, Cyathusal C shows up in a wide range of products such as anti-aging serums, daily moisturizers, sheet masks, soothing after-sun gels and brightening eye creams.
Cyathusal C’s Cosmetic Benefits/Uses
Below are the main ways Cyathusal C improves a formula
- Antioxidant: Helps neutralize free radicals created by UV light and pollution which can lead to dullness and early wrinkles. This protective action supports a more even tone and firmer look over time
- Skin Conditioning: Contributes a soft, smooth feel on application, reinforces the skin barrier and aids in maintaining moisture levels so the complexion appears plump and comfortable
Who Can Use Cyathusal C
Cyathusal C is gentle enough for most skin types including oily, dry, combination and sensitive skin thanks to its mild antioxidant profile and non-greasy finish. Those with very reactive or highly compromised skin should still start slowly because any new ingredient can sometimes cause irritation when the barrier is already impaired.
The compound is sourced from the Cyathus mushroom, not animals, and the extraction solvents are plant derived, so both vegans and vegetarians can use products containing Cyathusal C without concern about hidden animal by-products.
No data currently suggest that topical Cyathusal C poses a specific risk to pregnant or breastfeeding women. That said, this information is not medical advice and anyone who is pregnant or nursing should check with a doctor before adding new skincare products.
Cyathusal C does not make skin more sensitive to sunlight. Standard daily sunscreen use is still recommended, but extra sun avoidance measures are not needed solely because of this ingredient.
Potential Side Effects/Adverse Reactions
Side effects from topical Cyathusal C differ from person to person. The points below outline potential reactions, though most users will not run into these issues when the ingredient is formulated and used correctly.
- Mild redness or warmth shortly after application
- Temporary itching in people with very sensitive skin
- Allergic contact dermatitis in rare cases for those with a mushroom allergy
- Stinging on broken or freshly exfoliated skin
- Possible interaction with leave-on acid treatments that could heighten irritation for some users
If you notice persistent irritation or any unexpected reaction, stop using the product and consult a healthcare professional or dermatologist
Comedogenic Rating
Rating: 1/5
Cyathusal C is a water-soluble polyphenol that does not leave an oily film or create occlusive layers, so it has little tendency to block pores. Its antioxidant action works at the surface level and it is typically used at low percentages, both of which further reduce any clogging risk. For these reasons the ingredient is generally considered suitable for people who are prone to acne or frequent breakouts.
Keep in mind that the finished product formula counts just as much as the single ingredient. Heavy plant oils, waxes or silicones paired with Cyathusal C can still raise the overall pore-clogging potential.
Summary
Cyathusal C delivers two main benefits: it neutralizes free radicals to protect against early aging and strengthens the skin barrier so the surface feels smoother and stays hydrated. By scavenging oxidative molecules it helps maintain a more even tone while its mild conditioning effect supports softness and comfort.
The compound is gaining moderate popularity as brands look to mushrooms for novel actives. It shows up most often in antioxidant serums, calming lotions and after-sun products rather than across every category, so it is still considered a niche yet emerging ingredient.
Overall safety is high with only rare reports of irritation or allergy and no known photosensitivity. As with any new skincare addition a short patch test on a small area is a smart step before applying a full-face product that contains Cyathusal C.