Many Factors Contribute to Hair Damage. Environmental elements, including the sun, the wind and dry, humid climates This damage affects a great percentage of amino acids in the protein chains, ultimately weakening the hair’s internal structure and cuticle. The most effective method of reconstructing the hair structure is through the use of keratin protein found in Joico’s exclusive Quadramine Complex. With the highest concentration of Quadramine Complex™ in its formulas, K-PAK delivers the ultimate in healthy hair. K-PAK products work synergistically to rebuild, reconstruct, strengthen and protect damaged hair.