Is PRP treatment effective for hair loss?

Lately, I've been losing a lot of hair, and the crown of my head looks very thin, as if I have alopecia areata. I'm planning to visit a hair loss specialist clinic for treatment. I heard about PRP therapy, which uses your own platelets to strengthen hair roots and induce hair growth. For those who have actually received this treatment, how effective is it? Does it really strengthen the hair roots?