Using cyclosporin derivatives in position 3 for hair growth.

A promoting agent for hair growth comprising a cyclosporine analogue substituted at position 3 represented by formula 1 as an active ingredient wherein: MeBmt represents N-methyl- (4R) -4 - -2-butenyl [(E) ] -4-methyl-L-threonine; Abu represents L-aminobutyric acid; MeLeu represents N-methyl-L-leucine; VA represents L-valine; Ala represents L-alanine; DAla represents D-alanine; MeVal represents N-methyl-L-valine; wherein X is [D-2-ethylthio-sarcosine], [D-2-propylthio-sarcosine], [D-2-isopropylthio-sarcosine], [D-2-allylthio sarcosine], [D-2-benciltio- sarcosine], [D-2- (4-nitrophenyl) thio-sarcosine] or [D-2- (dimethylthiocarbamyl) dithio-sarcosine].