Platelet-rich plasma (PRP) has emerged as a new treatment modality in regenerative plastic surgery,
and preliminary evidence suggests that it might have a beneficial role in hair regrowth. Here, we report
the results of a randomized, evaluator-blinded, placebo-controlled, half-head group study to
compare, with the aid of computerized trichograms, hair regrowth with PRP versus placebo. The
safety and clinical efficacy of autologous PRP injections for pattern hair loss were investigated.
PRP, prepared from a small volume of blood, was injected on half of the selected patients’ scalps with
pattern hair loss. The other half was treated with placebo.
