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Antimicrobial

USNEA LONGISSIMA EXTRACT

Updated
48

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

An extract of Usnea longissima, a usnic-acid-rich lichen. Same risk profile as other Usnea species — hepatotoxic in oral exposure and a documented contact allergen.

Function

SKIN CONDITIONING

Skin benefits

  • Lichen-derived antimicrobial compounds (usnic acid)
  • Traditional medicinal use
  • Antioxidant phenolics

Known concerns

  • Usnic acid hepatotoxicity — documented liver-failure cases from oral supplements (LiverTox/NIH)
  • Documented contact allergen on lichen patch-test panels
  • Photo-toxic potential
  • No CIR/SCCS dossier endorsing cosmetic use

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

Related antimicrobials

48
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ZIRCONIUM SILVER PHOSPHATE
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GERMANIUM DIOXIDE
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ALUMINUM BROMOHYDRATE
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ALUMINUM ZIRCONIUM PENTACHLOROHYDRATE
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ALUMINUM ZIRCONIUM PENTACHLOROHYDREX GLY
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AMMONIUM PHENOLSULFONATE
Antimicrobial

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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.