Abstract: A hair and/or scalp treatment composition comprising an amino-oxo-indole-ylidene compound of general formula (I): (I) formula should be here in which: R1, R2, R3 and R4 are each, independently, hydrogen or a monovalent organic group selected from alkyl, alkenyl, alkynyl, aryl, alkylenearyl, cycloalkyl, cycloalkenyl, and heterocyclyl.

Abstract: The invention provides a hair and/or scalp care composition comprising a terpenoid compound of formula (I), (II) or (III) in which R1 to R11 are each, independently, —H, —F, —Cl, —Br, —I, —OH, lower alkyl (e.g. C1-6 alkyl) or lower alkoxy (e.g. C1-6 alkoxy).

Abstract: The invention provides a hair and/or scalp care composition comprising a flavonoid compound of general formula (I) in which: R1, R3 and R4 are each, independently, —H,—F,—Cl,—Br,—I,—OH, lower alkyl (e.g. C1-6 alkyl) or lower alkoxy (e.g. C1-6 alkoxy); and R2 is —H or an alkenyl group.

Abstract: A hair and/or scalp treatment composition comprising an amino-oxo-indole-ylidene compound of general formula (I): (I) formula should be here in which: R1, R2, R3 and R4 are each, independently, hydrogen or a monovalent organic group selected from alkyl, alkenyl, alkynyl, aryl, alkylenearyl, cycloalkyl, cycloalkenyl, and heterocyclyl.

Abstract: The invention provides a hair and/or scalp care composition which is a shampoo composition, comprising an anionic cleansing surfactant in an amount of from 5 to 30 wt % and visnadin. The invention also provides a hair and/or scalp care composition which is a conditioner composition, comprising a cationic conditioning surfactant in an amount of from 0.01 to 10 wt % and visnadin. The invention also a method of treating and/or preventing inflammatory skin conditions such as the scalp skin itching and flaking associated with dandruff, which method comprises topically applying a composition according to the invention to the hair and/or skin, preferably to the hair and/or scalp.