PRP injections can be effective in treating male and female pattern baldness, both in preventing hair loss and promoting new hair growth. Most research on PRP for hair loss has focused on its use to treat androgenic alopecia (AGA). Also known as hormone-related baldness, this is a condition that can affect both men and women. In men with AGA, hair loss typically occurs on the top and front of the head. In women, thinning occurs on the top and crown of the head and often begins with the center hair part growing wider. PRP can also aid in the stimulation of hair growth after hair transplants. Growth factors, collagen and stem cells in PRP are used to help regrow thinning hair.