Dihydrotestosterone

This impact of dihydrotestosterone (DHT) (androgenic hormones) on hair loss (androgenic alopecia).

Decreased blood flow to follicle, causing follicle to progressively shrinks
Decreased keratin (hair protein) production
Cell division is disrupted; hair stem anchors itself less firmly to follicle
Oil/Sebum invades less differentiated (disrupted epithelial cells) with toxins

Hair Loss DHT Hair Follicle

Also see Stages of Hair Loss