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

    May 2008 in “ Journal of cosmetic dermatology ”
    Tania Cristina de Sá Dias, André Rolim Baby, Telma Mary Kaneko, Maria Valéria Robles Velasco
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    Studysummary This study found that adding certain conditioning agents, including jojoba oil and lauryl PEG/PPG‐18/18 methicone, to ammonium thioglycolate straightening emulsions protected Afro-ethnic hair from protein loss and improved resistance to breakage. Our plain-language summary of this paper — not a Tressless recommendation.
    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.
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