Antimicrobial
USNEA BARBATA CALLUS EXTRACT
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Old man's beard lichen callus extract — captures the antimicrobial usnic acid of the natural lichen but in a controlled biotech form. Usnic acid is a documented sensitizer, so this remains a cautious-use ingredient.
Function
Skin benefits
- Usnic acid antimicrobial activity
- Antioxidant lichen acids
- Sustainable biotech sourcing
- Reduced allergen vs raw lichen
Known concerns
- Usnic acid is a documented contact sensitizer
- Hepatotoxicity in oral usnic acid supplements
- Photosensitization possible
- Cytotoxic at higher concentrations
- EU restrictions on usnic acid in some products
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related antimicrobials
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.