Does PRP actually work for hair loss?

Yes, prp is effective for hair loss.  I do prp with progesterone injections to get the best results with hair growth and quality. I also have all my patients use viviscal, rogaine, and propecia when getting prp. I recommend getting a formal evaluation with a hair loss expert. Best, Dr. Emer

Thank you for this great question.
As far as PRP and hair restoration, it works best when used in conjunction with a hair transplant. A good way to think about it is as a better fertilizer for the implanted hair follicles, improving survival, growth and density of the transplanted hair. As an isolated intervention, it has definitely shown in numerous high-quality studies to have a positive effect on the number of hairs and thickness of hairs in the treated regions compared to control, with most patients noting an improvement. However, the degree of improvement is limited. The concentration of the platelets in the PRP is something that has been studied extensively as well, and it has been shown that between 1-1.5 million platelets/uL is ideal for the purpose of hair restoration. This is anywhere between 4-7x concentration of platelets in our blood. Concentrations higher than 1.5 million platelets/uL are actually detrimental to the hair growth process. Many practitioners who offer PRP for hair restoration will have concentrations of 2-3x normal, which is certainly better than nothing but may not give maximal efficacy. Typically, you get 3-4 treatments every 4 weeks, then annually, as the effects of the PRP are generally lost by 12 months.
Topical Minoxidil (Rogaine) and oral Finasteride (Propecia) are still the mainstays for non-surgical hair restoration, and if you've already started using them, make sure to keep it up. Given the safety profile of PRP, it may be a good alternative for patients who have had little success with Minoxidil and Finasteride or cannot tolerate the associated side effects. Laser caps have also shown some promising results in slowing down hair loss, but again, typically used as an adjunctive (add-on) intervention.   
Ultimately, if you are able to afford it, are motivated and are getting increasingly concerned with your hair loss, I'd recommend visiting a hair restoration specialist to talk about a hair transplant as it is the only way to actually add new hair to the balding scalp. Hope that helped! Best, Dr. Roy.

PRP is excellent at reducing inflammation and supporting the hair follicle. Using your own growth factors, you are able to stimulate growth. I have many, many happy success stories. Where PRP fails is in treating purely hormonal hair loss. In your case, you are hormonally modulating with propecia and with minoxidil. It is possible reducing inflammation may help you as the pathway is different then what you are doing. I would NOT do a-cell as an additive as it is made from pig bladder and there are increasing number of cases of rejection...leading to way more hair loss as pig-bladder is a substance the body recognizes as foreign and attacks. I am happy to read that your combination of minoxidil and propecia are working, and you can try PRP to see if it will take you to that next level. Best of luck!