Platelet-Rich Plasma Therapy for Hair Restoration

Part of our complete guide to Hair Loss and Restoration.

Hair loss affects approximately 6.5 million men and 8 million women in the United Kingdom, according to the NHS. Whilst the emotional impact of hair thinning is well documented, advances in regenerative medicine have introduced promising non-surgical options. Platelet-rich plasma (PRP) therapy has emerged as one of the most evidence-backed treatments for hair restoration. This offers a biological approach that harnesses the body’s own healing mechanisms. Practitioners are trained in the latest PRP protocols for both male and female pattern hair loss.

What is platelet-rich plasma?

PRP is an autologous blood product, meaning it is derived from the patient’s own blood, that contains a concentrated preparation of platelets suspended in a small volume of plasma. Platelets are best known for their role in blood clotting, but they also contain over 300 bioactive proteins, including growth factors that are fundamental to tissue repair and regeneration.

The key growth factors present in PRP that are relevant to hair restoration include:

• Platelet-derived growth factor (PDGF)stimulates cell proliferation and angiogenesis
• Transforming growth factor-beta (TGF-β)regulates cell differentiation and extracellular matrix formation
• Vascular endothelial growth factor (VEGF)promotes new blood vessel formation around hair follicles
• Epidermal growth factor (EGF)stimulates cell growth and differentiation
• Insulin-like growth factor (IGF-1)promotes hair follicle growth and delays catagen phase entry

The science behind PRP for hair loss

The scientific rationale for PRP in hair restoration is grounded in the understanding that androgenetic alopecia (pattern hair loss) involves not just hormonal miniaturisation of follicles and perifollicular inflammation and reduced blood supply to the hair follicle unit. PRP addresses multiple aspects of this pathology simultaneously.

A landmark meta-analysis published in Dermatologic Surgery (Giordano et al., 2018) reviewed 11 randomised controlled trials and concluded that PRP treatment produced statistically significant improvements in hair density and thickness compared to placebo. The pooled data showed an average increase in hair count of 33.6 hairs per square centimetre after a course of PRP treatments.

Further research by Gentile et al. (2015), published in Stem Cells Translational Medicine, demonstrated using immunohistochemistry that PRP injections increased the number of follicles in the active growth (anagen) phase, enhanced perifollicular vascularity, and upregulated the expression of fibroblast growth factor-7 (FGF-7), a key signalling molecule in the hair growth cycle.

The PRP treatment process

Our PRP hair restoration protocol follows established clinical guidelines to ensure optimal platelet concentration and patient comfort:

Blood collection and preparation

A small volume of blood (typically 20-60ml depending on the system used) is drawn from the patient’s arm using standard phlebotomy technique. The blood is then placed in a specialised centrifuge system that separates it into its component layers. The platelet-rich layer is carefully extracted, yielding a concentrate typically 3-7 times the baseline platelet count.

Scalp preparation and injection

The treatment area is mapped and topical anaesthesia or nerve blocks are applied to ensure patient comfort. The PRP is then injected into the scalp at the level of the hair follicle bulge, the region containing stem cells that drive follicle regeneration, using a series of microinjections spaced approximately 1cm apart across the affected area.

Treatment Schedule

The standard evidence-based protocol involves an initial course of three to four treatments spaced 4-6 weeks apart, followed by maintenance sessions every 3-6 months. Research by Rodrigues et al. (2019) in the International Journal of Trichology demonstrated that this phased approach produces superior results compared to single treatments, with peak improvements typically visible at 6-12 months from the start of therapy.

Who is a suitable candidate?

PRP therapy is most effective for patients in the early to moderate stages of hair thinning where follicles are miniaturised but still present. Ideal candidates include:

• Men with Norwood-Hamilton stages II-V androgenetic alopecia
• Women with Ludwig stages I-II female pattern hair loss
• Patients with diffuse thinning who wish to avoid or supplement medical therapy
• Post-hair transplant patients seeking to optimise graft survival and native hair preservation
• Individuals with traction alopecia where the follicles remain viable

PRP is generally not effective for areas of complete baldness where follicles have been permanently lost, as it cannot regenerate follicles that no longer exist. A thorough scalp assessment with dermoscopy is performed during the initial consultation to determine candidacy.

Safety profile and considerations

Because PRP is derived from the patient’s own blood, the risk of allergic reaction or immune rejection is essentially nil. The treatment has an excellent safety profile, with the most commonly reported side effects being mild scalp tenderness, temporary swelling at injection sites, and occasional bruising, all of which typically resolve within 24-48 hours.

Contraindications include blood disorders, active scalp infections, anticoagulant therapy, platelet dysfunction syndromes, and chronic liver disease. A detailed medical history is taken before any PRP treatment to ensure patient suitability.

Combining PRP with other hair restoration strategies

PRP works together with other evidence-based hair loss treatments. Many of patients benefit from a multimodal approach that may include medical therapy (finasteride, minoxidil), low-level laser therapy (LLLT), nutritional optimisation, and scalp microneedling. Published evidence in Hair Therapy and Transplantation suggests that combining PRP with microneedling may enhance growth factor penetration and improve clinical outcomes beyond either treatment alone.

Frequently asked questions

How many PRP sessions are needed for hair restoration?

The standard protocol involves an initial course of 3-4 treatments spaced 4-6 weeks apart, followed by maintenance sessions every 3-6 months. Most patients begin to see improvements after the second or third session, with optimal results at 6-12 months.

Is PRP for hair loss painful?

Most patients report only mild discomfort during PRP scalp injections. Topical anaesthesia or nerve blocks are applied before treatment to minimise sensation. The procedure typically takes 30-60 minutes and patients can return to normal activities immediately afterwards.

Can PRP regrow hair on completely bald areas?

PRP is most effective for areas of thinning hair where follicles are still present but miniaturised. It cannot regenerate hair follicles that have been permanently lost. This is why early intervention is recommended, the sooner treatment begins after the onset of thinning, the better the potential outcomes.

Are there any side effects of PRP hair treatment?

Because PRP uses the patient’s own blood, the risk of allergic reactions is negligible. Common side effects are mild and temporary, including scalp tenderness, minor swelling, and occasional bruising at injection sites. These typically resolve within 24-48 hours.