during 3 consecutive summers , patients from a total group of 40 persons with polymorphous light eruptions ( pmle ) participated in a randomized , double-blind , cross-over study comparing the sun-protective effect of placebo capsules , a chloroquine derivative ( 200 mg daily of oxychloroquine ) , and a carotenoid preparation ( betacarotene and canthaxanthine in a daily total dose of 100 mg ) .
C0007271
carotenoid
C0053396
betacarotene