volfan6782
Pass the eggnog
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Beard hair growth, unlike the growth of head hair or other facial hair, like eyelashes, depends on compounds called androgens. Androgens are responsible for what are considered masculine features. The most famous androgen is our old friend we learned about in middle-school health class, testosterone.
Testosterone fueled your conversion from a boy to a man and took you through those hellish emotional changes and awkward physical changes we all had to suffer through. Now that you are an adult, your manly hormone keeps your muscles firm and useful and keeps your sex drive at a normal level. It is also beard food.
Inside each of your follicles is a structure called the dermal papilla. The dermal papillae are kind of like the brains of your hair follicles. The ones in your beard follicles respond to the messages that your androgens send and cause the surrounding parts of the hair follicles (called the hair matrix) to do their thing and make some damn beard hair. Guess what androgen tells the beard hair follicles to activate the hair matrix? Yep, testosterone.
Why You Have A Patchy Beard « The Beard Coach : Grow Your Beard