1 citations
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February 2022 The researchers reported that lavender shampoo activated alpha brain waves, suggesting calming and memory effects, while geranium shampoo enhanced arousal and memory by stimulating brain waves in the laryngeal lobe.
45 citations
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December 2006 in “Biopolymers” This study found that permanent waving treatment induces structural changes in the cortex proteins of white human hair, significantly reducing its tensile strength without altering the S-S band intensity.
October 2025 in “Journal of the Endocrine Society” This study observed that finasteride, while lowering cholesterol levels, did not decrease the prevalence of clinical cardiovascular events or new ECG abnormalities in men with benign prostatic hyperplasia compared to controls, suggesting a potential disconnect between cholesterol management and cardiovascular risk reduction with this treatment.
70 citations
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June 1998 in “Polymer” This study found that permanent waving treatment partially disrupts the α-helical structure in human hair microfibrils, primarily during the initial reduction phase, rather than just affecting disulphide bonds.
4 citations
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January 2007 in “Sen'i Gakkaishi” This study found that permanent wave treatment accelerates hair degradation after protease exposure, showing significant morphological differences compared to untreated hair and linked to damage from Alpha-helical region denaturation.