DHT is the hormone responsible for hair loss, hair shed, and as we tend to call it "hair fall out". DHT, a derivative of the male hormone testosterone, is the enemy of hair follicles on your head. Simply put, under certain conditions, like those after pregnancy, DHT wants those follicles dead. DHT attaches itself to the follicle, shrinks it down, causing thinning, and ultimately hair shed and fall out. An all natural DHT blocker, like the Oh Hey Mama Hair Serum, uses natural ingredients, like Saw Palmetto and Stinging nettle to reduce and block DHT at the hair follicle, allowing your hair to return to its growing phase, instead of its shedding phase. Both Saw Palmetto and Stinging Nettle are scientifically proven to block DHT when applied topically.