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The Growing Phase of Hair

Q: Someone told me that hair only grows at night when you are sleeping. Is this true?
 
A: No. This is not true. Your hair that is in its growing phase grows consistently throughout the 24-hour day. Of course, the hair of the average person only grows about half an inch per month (12.5 millimeters) which amounts to one-sixtieth of an inch (or .42 millimeters) per day. This is of course too little progress to really discern with the naked eye.
 
      According to Dr. Mike Philpott of the Centre for Cutaneous Research of Barts and the London Queen Maryís School of Medicine and Dentistry, ďThere is evidence," Philpott says, "that hair growth follows a circadian [24-hour] rhythm." "We have in fact found some of the circadian clock genes are expressed in hair follicles."
 
      It should be remembered that only 85-90% of the hairís follicles are in a growing phase at any given time. The remaining hairs are in a resting or shedding phase and are slated to be replaced when these phases complete. Itís the duration of these cycles that determines the ultimate length our hair can achieve and at what density it remains throughout its length.
 
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The hair growth phases
 
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