Protective Effect of Conditioning Agents on Afro-Ethnic Hair Chemically Treated with Thioglycolate-Based Straightening Emulsion

The study evaluated the protective effects of various conditioning agents on Afro-ethnic hair treated with thioglycolate-based straightening emulsions. The research found that adding conditioning agents like lauryl PEG/PPG-18/18 methicone, cyclopentasiloxane (and) PEG-12 dimethicone cross-polymer, jojoba oil, and aqua (and) cystine bis-PG propyl silanetriol to the straightening emulsions reduced protein loss, improved combability, and increased resistance to breakage. Jojoba oil and lauryl PEG/PPG-18/18 methicone showed the best overall results, while emulsions containing aqua (and) cystine bis-PG propyl silanetriol and cyclopentasiloxane (and) PEG-12 dimethicone cross-polymer provided the highest breakage resistance.