PRP can restore hair loss in the scalp. In women one treatment produces a noticeable effect, but additional treatments make the hair even thicker. In men it is less effective, but still helps, so usually at least two treatments are required. PRP often works well with mild to moderate hair loss, but a man who is largely bald will not get a great result with PRP. PRP may be combined with a hair transplant procedure. Results are typically noticeable within 3-4 months of the first treatment and good within 6 months of the last treatment.