A cyclopeptide is disclosed, which is represented by the following formula (I) or (I’): wherein R1 and G’ are defined in the specification. In addition, a pharmaceutical or cosmetic composition comprising the same and a method for preparing the same are also disclosed.本發明揭露一種下列式(I)或式(I’)所表示之環胜肽:其中,R1和G’如說明書之定義。此外,也揭露包含其之醫藥或化妝品組成物及其製備方法。