Abstract: According to the present invention there is provided a hair care composition comprising at least one tyrosine compound and at least one other amino acid compound selected from tryptophan compounds, histidine compounds and lysine compounds. The compositions of the present invention can improve the strength and condition of the hair.

Abstract: According to the present invention there is provided a hair care composition comprising: (a) at least one compound according to general formula (I): wherein each X is independently selected from substituted or unsubstituted, saturated or unsaturated carbon; n is 0-10; R1 is selected from hydrogen, alkyl, arylalkyl or alkaryl; R2 is selected from: (i) hydrogen; (ii) alkyl, preferably C1-C8 alkyl, more preferably C1-C4 alkyl; (iii) aryl, alkaryl, arylalkyl; (iv) hydroxyalkyl, hydroxyaryl, hydroxyalkaryl, hydroxyarylalkyl; (v) —Zm—N(R5)2; (vi) —Zm—Y—C(N(R5)2)═NR5; (vii) —Zm—S—Q; (viii) —Zp—S—S—Zp—CR5(N(R5)2—COOR6; (ix) —Zm—COOR5; each m is, independently 0-8, preferably 1-4; each p is, independently, 0-2, preferably 0; each Z is, independently, selected from substituted or unsubstituted, saturated or unsaturated carbon; Y is selected from a covalent bond and NR5; Q is selected from hydrogen or alkyl; R3 is select