The short answer here is that the science isn’t 100 percent conclusive that PRP can help regrow your hair or preserve the hair that you have.

Here’s an overview of some promising results from research on PRP and hair loss:

• A 2014 study Trusted Source of 11 people with androgenic alopecia found that injecting 2 to 3 cubic centimeters of PRP into the scalp every 2 weeks for 3 months could increase the average number of follicles from 71 to 93 units. This study is too small to be conclusive, but it shows that PRP may be able to help increase the number of hair follicles that can actively support healthy hair.
• A 2015 study by Trusted Source of 10 people receiving PRP injections every 2 to 3 weeks for 3 months showed improvements in the number of hairs, the thickness of those hairs, and the strength of the hair roots. This study helps provide extra support to the findings of other PRP and hair loss studies. But 10 people is still too small a sample size to be conclusive.
• A 2019 study compared two groups of people using different hair treatments for 6 months. One group of 20 used minoxidil (Rogaine), and the other group of 20 using PRP injections. Thirty people finished the study and results showed that PRP performed much better for hair loss than Rogaine. But the study also found that your level of platelets can affect how well your own plasma works for hair loss. A lower level of blood platelets may mean that PRP isn’t as effective for you.