What is platelet rich plasma?
Blood is made up of red cells, white cells, platelets, and plasma - the straw-coloured liquid they float in. Platelet rich plasma is plasma with a much higher concentration of platelets than normal blood. Platelets carry proteins known as growth factors, which help signal repair and new blood vessel growth when tissue is injured.
In platelet rich plasma hair restoration, those growth factors are delivered directly to the scalp. The goal is to prolong the growth phase of hair follicles, increase blood supply around them, and help miniaturized follicles produce thicker hairs. It's the same principle used in some sports medicine and wound-healing treatments.
How is PRP prepared for hair treatment?
- Blood draw. A nurse or doctor draws blood from your arm into tubes containing an anticoagulant, which stops it from clotting. The amount varies by system, from a couple of small tubes to a larger syringe.
- Centrifuge. The tubes are spun at high speed. Heavier red cells sink to the bottom, and the plasma rises to the top, with a thin platelet-rich layer in between.
- Separation. The platelet-rich portion is drawn off. Some systems use a second spin to concentrate the platelets further.
- Optional activation. Some providers add calcium chloride or another activator to trigger growth factor release; others rely on the body to activate platelets after injection.
- Injection. The PRP is injected into the scalp in many small deposits across the thinning area, usually within minutes of preparation.
The whole process, from blood draw to finished injections, typically takes under 90 minutes.
Why does the preparation method matter?
Because there's no universal standard, two clinics can both say they offer PRP while delivering quite different products. Researchers suspect this is one reason study results are inconsistent. The main variables are:
| Variable | What it means | Question to ask |
|---|---|---|
| Blood volume | How much blood is drawn to start with | How much blood do you draw per session? |
| Spin protocol | Single or double spin, speed and duration | Do you use a single or double spin, and why? |
| Platelet concentration | How many times more platelets than in whole blood | Do you know the platelet concentration your system produces? |
| White blood cell content | Leukocyte-rich or leukocyte-poor PRP | Is your PRP leukocyte-rich or leukocyte-poor? |
| Activation | Whether an activator is added before injection | Do you activate the PRP, and with what? |
| Delivery | Injection depth and spacing, or microneedling | How and where is the PRP delivered? |
You don't need perfect answers to every question, but a knowledgeable provider should be able to explain their choices clearly.
It's tempting to assume that a higher platelet concentration must be better, but that hasn't been clearly established for hair. Some research in other areas of medicine suggests there may be an optimal range, beyond which extra platelets don't add benefit. Similarly, whether white blood cells help or hinder scalp results remains debated. Be cautious of clinics that sell a "premium" PRP tier purely on the basis of bigger numbers, without explaining what evidence supports the extra cost.
Are PRP systems regulated?
The centrifuge systems and kits used to prepare PRP are medical devices, and many are FDA-cleared for preparing platelet rich plasma from a patient's blood. However, PRP itself is not FDA-approved as a treatment for hair loss, so using it on the scalp is considered off-label. That's legal and common in medicine, but it means the treatment's effectiveness for hair hasn't gone through the FDA approval process. Ask which system your clinic uses and whether it's cleared for PRP preparation.
What does the research say about how PRP affects hair?
Laboratory and clinical studies suggest PRP growth factors can stimulate the cells that surround hair follicles and support blood vessel formation. Several randomized trials in people with androgenetic alopecia have reported increased hair density or thickness compared with placebo, while others have shown less benefit. Overall, the evidence is promising but mixed, and outcomes vary from person to person. Studies with standardized preparation and longer follow-up are still needed. For a practical overview of results and candidacy, see PRP hair restoration.
Who should not have PRP?
Because PRP depends on healthy platelets, it isn't suitable for everyone. Tell your provider if any of these apply:
- A platelet disorder or low platelet count
- A bleeding or clotting disorder
- Blood-thinning medication that can't be safely paused
- Active infection, especially on the scalp
- Active cancer or chemotherapy
- Chronic liver disease or significant anaemia
- Pregnancy or breastfeeding - many providers postpone treatment
- Undiagnosed or sudden patchy hair loss
Does it matter who performs the treatment?
Yes. Preparing PRP is a clinical process that requires sterile technique, correct handling, and an understanding of scalp anatomy for injection. It also matters that someone diagnoses your hair loss before you're treated - PRP is aimed at pattern thinning, and it won't help conditions such as thyroid-related shedding or iron deficiency. Choose a board-certified dermatologist or hair restoration physician, or a practice where a physician directly supervises treatment. The choosing a company hub has a full vetting checklist.
How much does platelet rich plasma hair restoration cost?
US pricing is typically $500–$1,500 per session. Clinics using more advanced preparation systems or double-spin protocols sometimes charge toward the higher end, as do practices in major metro areas. Insurance rarely covers it. For a full-year budget, see PRP hair restoration therapy.
What should you do next?
If you're considering PRP, shortlist two or three physician-led providers and ask each how they prepare and deliver it, what results they expect for your stage of hair loss, and what the full plan costs. To compare vetted US providers quickly, request a free quote.
Related guides
Frequently asked
It depends on the system. Many clinics draw roughly the amount of a standard blood test, while some protocols use a larger syringe. The draw takes only a few minutes.
Yes. PRP for hair is autologous, meaning it's prepared from your own blood during the same visit. That's why allergic reactions and rejection are very unlikely.
Double-spin PRP is centrifuged twice - first to separate red cells, then to concentrate platelets further. Some providers believe it produces a stronger preparation, though no single method is proven best for hair.
Many do. Rules on who can inject vary by state. Whoever performs it, make sure a physician diagnoses your hair loss and supervises treatment, and that sterile technique is followed.
Blood thinners can increase bruising and may affect platelet function. Never stop a prescribed blood thinner on your own - your prescribing doctor and PRP provider should decide together whether treatment is safe.
Differences in preparation, platelet counts, the stage and type of hair loss, age, and whether other treatments are used all play a role. Early to moderate thinning tends to respond best.
About this guide
This is an independent overview to help you decide. Figures are typical US ranges, not a quote, and general information is not medical advice - confirm details at a consultation. See our methodology and disclosure.
