Composition based on hydrated lipidic lamelar phases or on liposomes containing at least one derivative of labdane, or a plant extract containing it; cosmetic or pharmaceutical, particularly dermatological composition containing it

A method for promoting hair pigmentation, comprising applying on the desired hair area, a hair treating effective amount of at least one composition comprising hydrated lipidic lamellar phases or liposomes containing at least in part a component selected from a derivative of labdane of formula I herebelow:

• ##STR11## in which:
• R.sub.1 and R.sub.2 are identical or different and each represent a hydroxy group or an --O--CO--R.sub.6 group in which R.sub.6 represents an alkyl radical having from 1 to 7 atoms of carbon, an alkoxy radical having from 1 to 7 atoms of carbon, or an alkenyl radical having from 1 to 7 atoms of carbon, optionally substituted by one or more hydroxy or ##STR12## groups in which R.sub.7 and R.sub.8 each represent an atom of hydrogen, an alkyl radical having from 1 to 4 atoms of carbon or R.sub.7 and R.sub.8 represent together and with the atom of nitrogen, a heterocyclic radical such as piperidino, morpholino, N'-methylpiperazino;
• R.sub.3 represents an atom of hydrogen or a hydroxy group;
• R.sub.4 represents an atom of oxygen to the assembly ##STR13## R.sub.5 represents an ethyl or vinyl radical;
• optionally in a pharmaceutically or cosmetically acceptable excipient.