Salerm Technique Salerm 21 B5 Silk Protein LEAVE-IN Conditioner Salerm 21 has been scientifically developed to add gloss (Provitamin B5) and life to damaged, treated, porous or dry hair. It also protects hair from harmful elements such as sunlight, heat, chlorine, salwater, etc. The silk proteins of SALERM 21 repair hair deeply because, due to their small size, reach the core. Provitamin B5 give you the natural shine of healthy, looked-after hair and is now incorporated in llposomes; makeing it 10 times more effective.