Using cephalopod‐inspired chemistry to extend long‐wavelength ultraviolet and visible light protection of mineral sunscreens

International Journal of Cosmetic Science

Clinical Summary

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What was studied

In a zinc oxide (ZnO) water‑in‑oil mineral sunscreen, investigators incorporated Xanthochrome (ammonium xanthommatin, XA) and evaluated coral safety (tested at 100 mg/L), formulation UV/visible performance, and human dermal tolerability via a repeat insult patch test (N=100).

Key findings

XA caused no adverse effects in coral cuttings at 100 mg/L; adding XA to ZnO sunscreen increased total UV absorbance by 28% and visible‑light blocking by 45% versus without XA, and produced no irritation or sensitization in a human RIPT (N=100).

Study limitations

No SPF or critical wavelength values were reported and there were no real‑world photoprotection outcomes; human testing was single‑arm without a comparator; coral safety was assessed only in cuttings at a single concentration.

Clinical implications

XA appears to boost visible‑light blocking in ZnO mineral sunscreens and showed no irritation/sensitization in a 100‑subject RIPT, with no coral‑cutting toxicity at 100 mg/L; however, clinical efficacy and comprehensive environmental data are not yet available.