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The Science Behind PRF: How Platelet-Rich Fibrin May Support Hair Growth

  • Hair Again Clinic
  • Aug 13
  • 6 min read

Hair thinning rarely has one simple cause. Genetics, hormones, stress, illness, nutritional deficiencies, ageing and some medical conditions can all affect the hair-growth cycle. That is why the best place to begin is with a careful assessment—not a one-size-fits-all treatment.




For suitable clients, Platelet-Rich Fibrin (PRF) offers a regenerative approach that uses a concentrated portion of the client’s own blood. Once prepared and placed into targeted areas of the scalp, PRF provides platelets, signalling proteins and a natural fibrin framework close to weakened or miniaturising follicles.

But what is happening beneath the surface, and what does the current research actually tell us?


What is PRF?

PRF stands for Platelet-Rich Fibrin. It is prepared from a small sample of your own blood using a centrifuge. The spinning process separates the blood into different components, allowing the practitioner to collect a platelet- and fibrin-rich portion for treatment.


Unlike many PRP preparation methods, injectable PRF is commonly prepared without an added anticoagulant. This allows fibrin to form naturally after preparation. The result is a fine three-dimensional matrix that can hold platelets and other cellular components within the treated area.

The exact composition of PRF varies according to the collection tubes, centrifuge, speed, time and clinical protocol used. For this reason, not every platelet-based treatment is identical, and results from one preparation method cannot automatically be applied to every other method.


Why platelets matter

Platelets are best known for helping blood clot, but they also contain signalling proteins involved in healing and tissue repair. Once activated, platelets release growth factors and cytokines that communicate with nearby cells.

These include:

  • Platelet-derived growth factor (PDGF), which is involved in cell signalling and tissue repair.

  • Vascular endothelial growth factor (VEGF), which supports the formation and function of small blood vessels.

  • Transforming growth factor beta (TGF-β), which plays a role in tissue remodelling and cell behaviour.

  • Fibroblast growth factors (FGFs), which participate in cell growth and repair processes.

These growth factors do not create brand-new follicles. Instead, they may help improve the biological environment around follicles that are still present and capable of responding.


The role of the fibrin matrix

The feature that gives PRF its name is fibrin. Think of fibrin as a delicate biological framework. It can help retain platelets and signalling molecules around the treatment area as the matrix gradually remodels.

Laboratory research suggests that injectable PRF can release growth factors over time and can encourage the proliferation and migration of human dermal papilla cells. Dermal papilla cells sit at the base of the follicle and help regulate hair formation and cycling. This is an encouraging biological mechanism, although laboratory findings do not guarantee the same degree of growth in every person.


How PRF may influence the hair-growth cycle

Each follicle moves through a repeating cycle:

  • Anagen: the active growing phase.

  • Catagen: a short transition phase.

  • Telogen: the resting phase.

  • Exogen: the stage in which the hair fibre is released or shed.


In pattern hair loss, genetically sensitive follicles gradually miniaturise. The active growth phase becomes shorter and each new hair may grow finer and shorter than the one before it.

PRF is being investigated as a way to support follicles through several connected actions:


1. Cellular signalling around the follicle

Platelet-derived growth factors may communicate with cells surrounding the follicle, including dermal papilla cells. Preclinical research suggests this signalling may support cell activity associated with follicle growth.


2. Support for local microcirculation

VEGF is involved in the development of small blood vessels. A healthy follicle depends on an adequate local supply of oxygen and nutrients, so vascular signalling is one proposed part of PRF’s effect.


3. A temporary regenerative scaffold

The fibrin network provides a local structure around which platelets and signalling proteins are held. This is one of the main biological differences between PRF and plasma preparations that contain less fibrin.


4. Support for tissue repair

PRF contains components involved in normal wound healing and tissue remodelling. This may help create a more supportive scalp environment, but it should not be described as a cure for an underlying hormonal, autoimmune, nutritional or medical cause of hair loss.


PRF compared with PRP

PRF and Platelet-Rich Plasma (PRP) are both autologous treatments, meaning they are prepared from the client’s own blood. Both aim to deliver concentrated platelets and growth-factor signalling to the scalp.


The main practical difference is the fibrin structure and the way each preparation is processed. PRF is typically collected using a lower-force protocol and commonly without anticoagulant, allowing a fibrin matrix to develop. PRP protocols usually use an anticoagulant and produce a more liquid plasma preparation.


PRF is sometimes described as “more advanced” or “stronger” than PRP. At present, that conclusion is not firmly established. Preparation methods vary widely, and high-quality head-to-head studies remain limited. The right option depends on the person, the diagnosis, the treatment protocol and the practitioner’s clinical assessment.


What does the research show?

Early human studies and case series report improvements in measures such as hair density, hair growth or patient satisfaction after injectable PRF. A 2024 systematic review identified encouraging results across a small group of studies, including research involving androgenetic alopecia. However, the authors also highlighted important limitations: small sample sizes, different PRF preparation methods, varying treatment schedules and inconsistent outcome measurements.


A 2021 laboratory study found that injectable PRF promoted the proliferation and migration of human dermal papilla cells and supported signals associated with their hair-inducing function. This helps explain a possible mechanism, but laboratory research is not the same as proving a predictable clinical outcome.


Overall, PRF is a promising treatment option, but the evidence base is still developing. Larger, well-controlled studies and more standardised protocols are needed to determine who benefits most, how PRF compares directly with PRP and which treatment schedule is optimal.


Who may be suitable for PRF?

PRF may be considered for men and women experiencing certain forms of non-scarring hair thinning, particularly when follicles are still present. This may include early male or female pattern hair loss and some cases of diffuse thinning, depending on the cause.


It may be less helpful where follicles have been permanently destroyed or where an untreated medical condition is driving the shedding. Sudden, patchy, painful or inflamed hair loss should be properly assessed before any regenerative treatment is planned.


At Hair Again Clinic, we look at the history of your hair loss, the pattern of thinning, scalp and follicle findings, relevant health factors and your treatment goals. Where appropriate, we may recommend blood tests or referral to a GP or dermatologist.


What happens during a PRF treatment?

Your appointment begins with confirmation that the treatment remains suitable for you. A small blood sample is then collected and processed in a centrifuge. The PRF portion is prepared and placed into targeted areas of the scalp using a series of small injections.


Mild tenderness, redness, swelling, pinpoint bleeding, tightness or a temporary headache can occur. These effects are generally short-lived, but every procedure carries risks and these will be discussed before treatment.


Hair growth is slow, so PRF is not an overnight treatment. Changes are assessed over several months using consistent photographs and, where appropriate, scalp imaging. A course of treatments is usually recommended rather than a single session. At Hair Again Clinic, our usual PRF plan is three treatments approximately one month apart, followed by a progress review and an individual maintenance discussion.


A treatment should support the diagnosis—not replace it

PRF may be one part of a wider hair-restoration plan. Depending on the diagnosis, that plan could also include correcting an identified deficiency, improving scalp health, using suitable home care, discussing prescription options with an authorised prescriber or considering another in-clinic treatment.

The most important step is understanding why your hair is changing. When the diagnosis and treatment plan are aligned, you can make a clearer and more realistic decision about PRF.


Considering PRF for hair thinning in Auckland?

Hair Again Clinic provides assessment-led hair-loss care for men and women in Auckland, including clients from Browns Bay, the North Shore and surrounding areas.

During your consultation, we will assess your scalp and hair, discuss the possible causes of your thinning and explain whether PRF—or another option—is likely to suit your needs. We believe in honest guidance, realistic expectations and a personalised plan.


Book a hair and scalp consultation with Hair Again Clinic to find the right way forward for your hair.


Platelet-Rich Fibrin uses platelets, growth factors and a natural fibrin matrix prepared from your own blood. Discover how PRF may support weakened hair follicles—and what the current research really shows.


References used for scientific review



Disclaimer

This information is general and educational and does not replace medical advice, diagnosis or treatment. Hair Again Clinic practitioners are hair-loss specialists, trichologists and registered nurses; we are not medical doctors. Results vary between individuals. If you have sudden, unexplained, painful, inflamed or medically concerning hair loss, please consult your GP or dermatologist.

 
 
 

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