What Is Cyathusal B?
Cyathusal B is a naturally derived compound first isolated from the bird’s nest mushroom, a small fungi species in the Cyathus family that grows on fallen wood in temperate forests. Chemically, it belongs to a class of polyphenols known for strong free radical–scavenging properties and a stable molecular structure that resists rapid breakdown when exposed to light or air. Researchers began studying it in the late 1990s while searching for plant and fungi extracts that could help preserve the freshness of food oils. Its impressive antioxidant profile quickly caught the attention of cosmetic chemists who realized the same protective action could help defend skin lipids from environmental stress.
Commercial production uses a controlled fermentation of Cyathus mycelium followed by a water-ethanol extraction and gentle filtration. The result is a clear amber liquid or fine powder that is easy to add at the cool-down phase of a formula, which helps maintain potency. You will most often see Cyathusal B in serums, anti-aging moisturizers, sheet masks, soothing after-sun gels, and targeted eye treatments where manufacturers want a plant-sourced antioxidant that also leaves skin feeling smooth and supple.
Cyathusal B’s Cosmetic Benefits/Uses
In skin care, Cyathusal B delivers two key actions that make it a versatile addition to many product types:
- Antioxidant – Neutralizes free radicals generated by UV light, pollution and daily stress which helps slow the look of premature lines and keeps skin tone brighter for longer.
- Skin conditioning – Binds a light layer of moisture to the surface, leaving skin soft and comfortable while improving the slip and feel of the overall formula.
Who Can Use Cyathusal B
Cyathusal B is generally considered suitable for all skin types including oily, combination, normal and dry. Its lightweight moisture binding action benefits dehydrated skin without leaving a greasy residue, while its antioxidant support helps calm redness that sensitive or reactive skin may experience. People with very oily or acne‐prone skin usually tolerate it well because the ingredient does not clog pores or leave a heavy film.
The compound is sourced from cultivated mushroom mycelium rather than animal material, so products using Cyathusal B can be formulated to meet vegan and vegetarian standards provided no other animal derived additives are present.
Current safety data show no specific concerns for pregnant or breastfeeding individuals when Cyathusal B is applied topically at the concentrations typically found in cosmetics. This is not medical advice and anyone who is pregnant or nursing should review any skincare routine with their healthcare provider to be safe.
Cyathusal B does not increase the skin’s sensitivity to sunlight, so it is not classed as a photosensitizer. Standard daytime sun protection practices still apply.
Potential Side Effects/Adverse Reactions
Side effects or reactions to topical Cyathusal B vary by individual. The issues listed below are possible but not common when a product has been formulated and preserved correctly.
- Mild transient redness
- Itching in individuals with mushroom allergies
- Stinging or warmth if applied to broken or freshly exfoliated skin
- Contact dermatitis in rare cases of specific sensitivity to polyphenols
- Interaction with strong acids or retinoids that can slightly destabilize formulas leading to irritation
If any persistent discomfort, rash or swelling occurs stop use immediately and consult a healthcare professional.
Comedogenic Rating
Rating: 0 / 5 — Non-comedogenic
Cyathusal B is water soluble and has a very low molecular weight so it does not leave an occlusive film on the skin. It lacks fatty acids and heavy waxes that normally clog pores which is why formulators rank it at zero on the comedogenic scale.
This makes the ingredient suitable for people who are prone to acne or frequent breakouts.
As with any raw material the finished product’s overall pore-clogging potential depends on the full formula. A serum packed with lightweight humectants will stay non-comedogenic while a rich balm that also contains thick oils could still trigger congestion even though Cyathusal B itself does not.
Summary
Cyathusal B works as an antioxidant that neutralizes free radicals and as a skin-conditioning agent that lightly binds water to the surface for a smoother feel. It delivers these benefits thanks to its stable polyphenol structure which remains active even when exposed to light or air.
The ingredient is still a niche choice found mostly in clean beauty lines and a few science-backed indie brands but its plant origin and gentle profile are boosting its popularity.
Current data shows Cyathusal B is safe for nearly all skin types with a very low risk of irritation. As with any new product a quick patch test on a small area is a smart step before adding it to your full routine.