Agents for inducing and/or stimulating the growth of human keratin fibers and/or preventing their loss and/or increasing their density include at least one 4-aminopiperidine compound of formula (I): in which: Alk<SUB>1 </SUB>and Alk<SUB>2 </SUB>are each, independently of one another, a linear saturated C<SUB>1</SUB>-C<SUB>10 </SUB>or unsaturated C<SUB>2</SUB>-C<SUB>10</SUB>, or branched C<SUB>3</SUB>-C<SUB>10 </SUB>saturated or unsaturated, alkylene radical (divalent radical); Ph<SUB>1 </SUB>and Ph<SUB>2 </SUB>are each, independently of one another, a phenyl group optionally substituted with one or more radicals, which may be identical or different, selected from among -F, -CF<SUB>3</SUB>, -R<SUB>1</SUB>, -OR<SUB>1 </SUB>and -NR<SUB>1</SUB>R<SUB>2</SUB>; R<SUB>1</SUB>, R<SUB>2 </SUB>and R<SUB>3 </SUB>are each, independently of one another, a linear saturated C<SUB>1</SUB>-C<SUB>7 </SUB>or unsaturated C<SUB>2</SUB>-C<SUB>7</SUB>, or branched or cyclic C<SUB>3</SUB>-C<SUB>7 </SUB>alkyl radical; or a salt, optical isomer or solvate thereof.
Administration of 4-aminopiperidine compounds for inducing and/or stimulating the growth of keratin fibers and/or preventing loss thereof