shaving stimulate hair growth / hypertrichosis
It is a common belief, but cutting or shaving hair does not stimulate
growth. Hair fiber is dead, if it is cut there is no way for the
dead hair to send a signal back to the hair follicle in the skin
to grow more hair. The studies to prove hair cutting did not stimulate
growth were done back in the 1920s but the belief still persists.
Several studies have been conducted where volunteers shaved half
of their beard or scalp hair and left the other half untouched.
The shavings were collected and measured and the hair left untouched
was also measured. The results showed that the amount of hair produced
was exactly the same whether the hair was regularly shaved or not.
shaving stimulate hair growth / hypertrichosis references
- Peereboom-Wynia JD. Effect of various methods
of depilation on density of hair growth in women with idiopathic
hirsutism. Arch Dermatol Forsch. 1972;243(3):164-76.
- Lynfield YL, Macwilliams P. Shaving and hair
growth. J Invest Dermatol. 1970 Sep;55(3):170-2.
- Trotter M. Hair growth and shaving. Anat
- Seymour RJ. The effect of cutting upon
the rate of hair growth. Am J Physiol. 1926;78:93-8
- Bulliard H. Influence de la section et
du rasage repete sur l'evolution du poil. Annales de Dermatologie
et de Syphiligraphie. 1923;Series 6:386-91