Methods and compositions for stimulating the growth of hair are disclosed wherein said compositions include a cyclopentane heptanoic acid, 2- cycloalkyl or arylalkyl compound represented by the formula Iwherein the dashed bonds represent the presence or absence of a double bond which can be in the cis or trans configuration and A, B, Z, X, R1 and R2 are as defined in the specification and a penetration enhancer. Such compositions are used in stimulating hair growth of human or non-human animals.本發明揭示刺激毛髮生長之方法及組合物，其中該等組合物包含下式I表示之環戊烷庚酸、2-環烷基或芳烷基化合物，及滲透促進劑：其中虛線鍵表示存在或不存在之雙鍵，可呈順式或反式組態，且A、B、Z、X、R1及R2係如本說明書所定義。該等組合物係用於刺激人類或非人類動物之毛髮生長。
