The use of extracts of Ambrosia peruvianaas active ingredient (I) for the preparation of cosmetic and/or dermopharmaceutical compositions (II) for treatment of the skin, nails and/or hair. Independent claims are also included for (1) compositions (II) as above containing 0.01-50 wt% extract (I) as active ingredient (2) compositions (II) obtained by a method involving hydroglycolic extraction and/or one or more successive or simultaneous enzymatic hydrolyses (3) compositions (II) in the form of creams, oil-in-water emulsions, water-in-oil emulsions, multiple emulsions, solutions, suspensions or powders .
