Use of glycosides to increase hair mass

A cosmetic method for increasing the diameter of hair fiber of an individual desiring such, which comprises applying to the scalp of said individual in order to increase the diameter of hair fiber at least one glycoside have the following formula (II):

• X being —O—, —C(Ra)=N—O— or —C(Rb)(Rc)-
• i is 0 or 1;
• Ra representing H or a linear or branched (C1-C6)alkyl group,
• Rb and Rc, are identical or different, representing H or a group chosen from the group consisting of hydroxy, alkoxy(C1-C6), alkoxy(C1-C6)amino, alkoxy(C1-C6)ammonium, alkoxy(C1-C6)-diamino, amino, (C1-C6)alkylamino, di((C1-C6)alkyl)amino, hydroxy(C1-C6)alkylamino, di(hydroxy(C1-C6)alkyl)amino, and (hetero)arylamino groups;
• R represents a (C1-C10)alkyl, linear or branched, said alkyl group being possibly substituted by at least one substituent chosen from the group consisting of ORa, —C(O)OH and —C(O)OR″2, R″2 being a linear or branched (C1-C4)alkyl group;
• or R represents a (C1-C4)alkyl(C6-C10)aryl group, said aryl group being optionally substituted by at least one substituent ORe, Re representing H or a linear or branched (C1-C6)alkyl group;
• the bond representing a bond of a C-anomeric nature, which is α or β,
• as well as the salts thereof, the solvates thereof and the optical and geometric isomers thereof.