Too bad they're not more specific with which type of hair (scalp, beard, torso, etc - though they kinda suggest beard) but I stumbled upon this by accident and found it interesting. I've been using peppermint during my shampooing for the last month or so and have noticed that it signifigantly retards sebum secretion on my scalp and face (along with slower beard growth)... but also thought my "donor areas" appeared to be growing slower, as well. Although initially spooked by the slow growth in my donor areas, I've continued using it and could swear that the flesh-colored, diffuse balding area that is my head has appeared to be getting darker, equaling some type of ground gaining, I'd assume.
This article suggests to me that maybe the potent anti-androgen properties of peppermint might be the cause of the perception of slower hair growth on the sides of my head... or would that not be the case because peppermint inhibits 5ar (resulting in reduced sebum secretion) and is not an anti-androgen? I don't know...
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Effects of Sex Steroid Deprivation/Administration on Hair Growth and Skin Sebum Production in Transsexual Males and Females
E. J. Giltay and L. J. G. Gooren
Research Institute for Endocrinology, Reproduction and Metabolism, University Hospital Vrije Universiteit, 1007 MB, Amsterdam, The Netherlands
Address correspondence and requests for reprints to: Erik J. Giltay, M.D., Department of Endocrinology, Division of Andrology, University Hospital Vrije Universiteit, P.O. Box 7057, 1007 MB, Amsterdam, The Netherlands. E-mail:
giltay@dds.nl.
To investigate androgen effects on the skin pilosebaceous unit, we studied 21 male-to-female transsexuals and 17 female-to-male transsexuals receiving cross-sex hormones. At baseline and after 4, 8, and 12 months, hair growth was evaluated by the Ferriman-Gallwey score; acne by the Leeds classification; hair growth rate, density, and shaft diameter by image analysis; and sebum production by Sebutape. In males, estrogens and antiandrogens reduced plasma testosterone to below 1.0 nmol/L. Though all parameters of hair growth and sebum production declined, facial hair growth continued. After 4 months, the decrease in shaft diameter had reached its maximum and seemed inversely associated with changes in hair growth length and density. In females, testosterone increased hair growth rate and sebum production. After 12 months, hairs on the cheek and abdomen had not yet reached diameters found in males. 5-Androstane-3,17ß-diol glucuronide levels were only weakly associated with hair growth and sebum production. In conclusion, administration of estrogens and antiandrogens affects length and diameter of hairs at different rates. In the virtual absence of androgens, hair growth continues but at a slower rate. In women, after 12 months of androgen administration, hair diameters have not reached values of adult men.
http://jcem.endojournals.org/cgi/conten ... /85/8/2913