The use of ecdysteroid(s) or their analogs or derivatives (I) is claimed in the production of a cosmetic or dermatological composition (A) for preventing hair loss. An independent claim is included for a cosmetic treatment method for preventing hair loss, involving application of a composition containing (I) to the scalp. ACTIVITY : Antialopecia. MECHANISM OF ACTION : Hair follicle survival promoter. In tests in an in vitro model for evaluating the effects of test compounds on the survival and lengthening of human hair follicles as described in , ecdysterone (Ia) at concentrations of 0.01 mu g/ml, 0.1 mu g/ml and 10 mu g/ml significantly promoted survival.
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