1. A method of stimulating hair growth in humans, comprising applying to the human skin an effective amount of a compound of 3.7 or 3 and 7 of thia or oxo-prostanoic acid represented by the formula I where the dashed lines represent the α configuration, the triangle represents the β configuration, and the dashed line indicates the presence or absence of a double bond； A and B are independently selected from the group consisting of O, S and CH； provided that at least one of A or B is S； D is a covalent bond or CH, O, S or NH； X is COR, CONR, CHOR, P (O) (OR), CONRSOR, SONR, tetrazole or triazole； Y is O, halogen or cyano； Z is CH or a covalent bond； R is H or R； R is H, R, or COR； and, R is C-C lower alkyl or alkenyl, and R is hydrocarbyl or a substituted derivative thereof, where the substituents can be selected from the group consisting of C-C1-6alkyl, halogen, CF, CN, NO, NR, COR, and OR in free form, or a pharmaceutically acceptable salt, in combination with a pharmaceutical carrier, adapted for topical application to the skin of a mammal. 2. The method according to claim 1, characterized in that Y is O.3. The method according to claim 2, characterized in that the concentration of the applied compound is from about 0.0000001% to about 50% by weight of the pharmaceutical carrier. The method according to claim 1, characterized in that the compound is selected from the group consisting of: methyl ester 3 - [(1R, 2S, 3R) -3-hydroxy-2 - ((S) - (E) -3- ( hydroxy) -5- (naphthyl) pent-1-enyl) -5-oxocyclopentylsulfanyl] propylsulfanyl} acetic acid； {3 - [(1R, 2S, 3R) -3-hydroxy-2 - ((S) - (E) -3- (hydroxy) -5- (naphthyl) pent-1-enyl) -5-oxocyclopentylsulfanyl] propylsulfanyl} acetic acid； isopropyl e1. Способ стимуляции роста волос у человека, включающий нанесение на кожу человека эффективного количества соединения 3,7 или 3 и 7 тиа- или окса-простановой кислоты, представленного формулой Iгде штриховые линии представляют α конфигурацию, треугольник представляет β конфигур
