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On your scalp it has nothing to do with Testosterone or other Androgens to my knowledge. But on your body an lower face absolutely your hair hair darkens on your body and face during adolescence. For example I used to have brown and thin arm hair but now it is black and thick thicker or darker body hair does not have anything to do with my Testosterone level other then fact i have enough. It has more to do with how my pores respond to androgens and how sensitive they are to them
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