The Effects of Epilation and Hormones on the Activity of Rat Hair Follicles

    January 1975 in “ Journal of Experimental Zoology ”
    Patricia A. Hale, Francis J. P. Ebling
    TLDR Epilation doesn't affect rat hair growth; thyroxine speeds it up, while estradiol slows it down.
    The study investigated the effects of epilation and various hormonal treatments on rat hair follicles using 35S-cystine pulse-labelling. Epilation did not alter the length, rate, or duration of hair growth in both untreated and hormone-treated rats. Thyroxine was found to shorten both the active and resting phases of the follicular cycle and increased the growth rate, resulting in hair lengths similar to untreated rats. Estradiol slightly shortened the active phase duration but prolonged the overall cycle and decreased the growth rate. When combined, estradiol and thyroxine acted independently on hair growth.
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