case study

The Impact of Oral Polypodium Leucotomos Extract on Ultraviolet B Response: A Human Clinical Study


There is a rationale for adding systemic photoprotective agents to the current photoprotection regimen.


This study was designed to objectively evaluate the molecular and photobiologic effects of oraladministration of Polypodium leucotomos extract (PLE).


In all, 22 subjects with Fitzpatrick skin phototype I to III were enrolled. On day 1, subjects were irradiated with visible light, ultraviolet (UV) A1, and UVB (using 308-nm excimer laser). Evaluation wasdone immediately and 24 hours after irradiation. On days 3 and 4, irradiation and evaluation process was repeated after ingestion of PLE.Results: Clinical assessments and colorimetry data showed a decrease in UVB-induced changes in 17 of 22subjects post-PLE administration; histology findings demonstrated such a decrease in all 22 subjects.


Only 2 doses of PLE were given. Furthermore, subjects with skin photo types I to III only were studied.


The results suggest that PLE can potentially be used as an adjunctive agent to lessen thenegative photobiologic effects of UVB.

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