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The Quest for More Effective Sunscreens

Isaac Willis, MD; Albert M. Kligman, MD, PhD

Arch Dermatol. 1970;102(4):405-417.

Abstract
The sunscreening efficacy of aminobenzoic acid and two of its best known esters was appraised on human subjects using solar-simulating radiation from the xenon lamp. Protection was measured in terms of the protective index, the ratio of the highest nonerythemogenic dose on the treated area to the minimal erythemal dose determined on a nearby untreated site.

Author Affiliations
Philadelphia

From the Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia. Dr. Willis is currently with the Letterman Army Institute of Research, San Francisco.

Footnotes
Accepted for publication May 9, 1970.

Reprint requests to 3600 Spruce St, Philadelphia 19104 (Dr. Kligman).

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