Disclosed herein are personal care compositions having at least one oligopeptide self-assembled into nanofibers or macrostructures, wherein the oligopeptide is 2-20 amino acids in length, and wherein the oligopeptide has at least one 0- to 10-amino-acid block of hydrophobic amino acids alternating with at least one 1- to 10-amino-acid block of hydrophilic amino acid residues. The composition may further include a dermatologically acceptable carrier and at least one cosmetic skin care agent.