i-PRF: Hair Growth & Skin Rejuvenation Experiences
Injectable Platelet-Rich Fibrin (i-PRF) is an autologous blood therapy that has gained increasing attention in various medical fields in recent years. Based on laboratory studies, clinical work, and practical application in medical practices, i-PRF represents a distinct variant of platelet-rich concentrates. It is characterized by specific properties that differentiate it from other autologous blood products like classic PRP (Platelet-Rich Plasma).
Source: Own Representation
Introduction to i-PRF
i-PRF is an autologous blood preparation obtained from a small amount of venous blood without the addition of anticoagulants (Quelle). Centrifugation separates the blood into layers. The upper, yellowish-transparent part contains a concentrate of fibrin precursors, platelets (thrombocytes), leukocytes, and various growth factors. This liquid portion can be injected as i-PRF (Quelle, Quelle).
Unlike classic PRP, i-PRF rapidly forms a three-dimensional fibrin network after injection. Cells and growth factors are enclosed in this network and released over a longer period. (Quelle, Quelle). In vitro studies show that liquid PRF stimulates fibroblasts to migrate, proliferate, and produce collagen more strongly than PRP. (Quelle).
From a dermatological perspective, i-PRF is considered the 'second generation' of platelet-rich concentrates. It is produced without additives and with low centrifugation force to retain more cells and growth factors in the concentrate. (Quelle, Quelle).
The production of i-PRF is standardized: a small amount of blood (often 10–60 ml) is drawn into special glass or plastic tubes without anticoagulant. (Quelle, Quelle). The blood is then centrifuged at a low rotational speed ('low speed centrifugation concept') for a few minutes. The lighter, cell-rich fraction settles at the top. (Quelle, Quelle).
The liquid PRF fraction must be processed and injected quickly, as natural clotting begins within minutes, otherwise the material will solidify into a gel or clot. (Quelle). In aesthetic treatments, i-PRF is injected into the mid or deep dermis with fine needles or dull cannulas, for example, in the area of dark circles, cheeks, or nasolabial folds. (Quelle, Quelle).
Many practices combine i-PRF with microneedling: the skin is first treated with a needling pen, and then liquid PRF is introduced into the created microchannels or additionally injected. Systematic reviews describe this combination as a minimally invasive approach to skin rejuvenation with initial positive results. (Quelle, Quelle).
Source: YouTube
Areas of Application
i-PRF is used in various medical disciplines. The main areas include aesthetic dermatology, hair loss treatment, dentistry, and orthopedics and sports medicine.
Face and Skin Rejuvenation
In aesthetic dermatology, i-PRF is primarily used to improve skin texture, moisture, fine lines, and dark circles. (Quelle, Quelle). A prospective study on i-PRF in the face showed measurable improvements in wrinkle depth and skin texture after several sessions, recorded using objective skin analysis systems and patient questionnaires. (Quelle).
Reviews of PRF in aesthetic medicine conclude that platelet-rich fibrin preparations can stimulate collagen production and contribute to visible brightening and tightening in periorbital areas (tear troughs, dark circles). However, the data basis is still limited and heterogeneous. (Quelle, Quelle, Quelle).
An example from practice is the 'Gold Facial' or 'Cleopatra' treatment, which combines microneedling with topical and injectable PRF to treat the face, neck, and décolleté over large areas. (Quelle, Quelle).
Hair Loss (Androgenetic Alopecia)
Another important area of application is diffuse or hereditary hair loss. Growth factors such as PDGF and TGF-β from platelet-rich preparations can stimulate hair follicle stem cells and improve blood circulation in the scalp. (Quelle, Quelle).
A prospective study on i-PRF in androgenetic alopecia reported clinically visible increases in hair density and high patient satisfaction after several injection sessions spaced a few weeks apart. (Quelle). More recent studies directly compare i-PRF with PRP and suggest that i-PRF, due to its slower release of growth factors and fibrin component, could provide a longer-lasting stimulus to the follicles. However, these results still need to be confirmed by larger studies. (Quelle, Quelle, Quelle).
Source: hairpalace.de
i-PRF treatment is injected directly into the scalp to stimulate hair growth.
Practice reports from hair clinics describe that i-PRF is usually used as a series of three to six sessions and is often combined with standard therapies such as minoxidil or finasteride to stabilize the effect. (Quelle, Quelle).
Source: YouTube
Even in German-speaking countries, there are centers that use i-PRF together with microneedling for hair loss and explain the procedure to patients in video form. (Quelle).
Source: hairpalace.de
Impressive results: Before-and-after comparison after an i-PRF treatment for hair growth stimulation.
Dentistry, Oral Surgery, and Periodontology
In regenerative dentistry, i-PRF is used as an adjunct in bone augmentation, sinus lifts, implantations, and periodontal defects. (Quelle, Quelle). Laboratory studies show that i-PRF can promote the formation of new blood vessels and the activity of osteoblasts on bone surfaces and in combination with bone graft materials. (Quelle, Quelle).
Review articles on periodontal regeneration describe i-PRF as a promising adjunct to classic surgical procedures. However, they point out that the evidence for hard tissues (bone) is weaker than for soft tissues (gums, mucosa). (Quelle, Quelle).
Orthopedics and Sports Medicine
Currently, i-PRF is also being investigated in orthopedics, for example, in osteoarthritis, tendinopathies, or cartilage damage. A review article describes i-PRF as an easily obtainable, autologous concentrate with potentially regenerative effects on cartilage and connective tissue. (Quelle). Preclinical data and initial clinical series suggest that i-PRF can modulate inflammatory mediators and stimulate the matrix production of chondrocytes. However, large, controlled studies are still lacking in this area. (Quelle, Quelle).
Scientific Evidence
Basic research on i-PRF includes in vitro and animal models. Here, i-PRF showed an increased release of growth factors such as PDGF, TGF-β, and VEGF over several days and stimulated fibroblasts and other cells more strongly than PRP. (Quelle, Quelle, Quelle). A study on antibacterial effects found that i-PRF can inhibit the growth of various oral bacteria and biofilms, making it interesting for use in oral surgery. (Quelle).
Narrative and systematic reviews summarize the clinical experience of the last ten years: PRF (including i-PRF) appears to improve soft tissue healing after oral surgery, reduce pain, and stabilize peri-implant tissue. The benefit for bone augmentation varies depending on the study. (Quelle, Quelle).
For aesthetic dermatology, several clinical studies on i-PRF for facial aging are available. A prospective study on facial rejuvenation found significant improvement in wrinkles, skin elasticity, and pigmentation after several i-PRF sessions, measured with objective skin analysis systems. (Quelle). A systematic review on microneedling plus i-PRF reports consistent improvements in skin texture and fine lines, but emphasizes the low number of high-quality studies and the significant heterogeneity of protocols. (Quelle, Quelle).
In the field of hair loss, more recent studies conclude that i-PRF has increased hair density and improved patient satisfaction in several studies, sometimes with better results than PRP. However, this was observed in small sample sizes and short observation periods. (Quelle, Quelle, Quelle, Quelle). At the same time, meta-analyses on PRP in alopecia show that even for the more established PRP procedure, the results are not consistently positive in all studies. (Quelle, Quelle).
In dermatology, current reviews summarize PRF (including i-PRF) as a potent, but not yet fully understood tool. There is positive data for scars, chronic wounds, skin rejuvenation, and certain hair conditions, but with a clear need for larger, well-controlled studies. (Quelle, Quelle).
Opportunities and Limitations of i-PRF Compared to PRP
Theoretically, i-PRF offers several advantages over PRP: it is produced without anticoagulants, contains a fibrin network, and a higher density of leukocytes and possibly stem cells. This can lead to a longer release of growth factors and stronger cell stimulation. (Quelle, Quelle). Studies that directly compare i-PRF and PRP often find higher concentrations of certain growth factors and a more sustained release over several days with i-PRF. (Quelle, Quelle).
On the other hand, the production of i-PRF is more time-critical, as natural clotting sets in rapidly and the material then becomes non-injectable. (Quelle). Furthermore, the protocols (rotation speed, time, tube type) are less standardized than with many PRP systems, which makes comparing studies difficult and can affect reproducibility. (Quelle, Quelle).
It is important for patients to understand that both PRP and i-PRF are not yet supported by large Phase III studies for many indications and are often used as adjuncts to established therapies, not as replacements. (Quelle, Quelle).
Treatment Procedure
The typical course of an i-PRF treatment in many practices is as follows: First, there is an informational discussion with anamnesis, exclusion of contraindications (e.g., severe coagulation disorders), and photo documentation. (Quelle, Quelle). Subsequently, blood is drawn and centrifuged on-site. During this time, the treatment area is disinfected and usually locally anesthetized. (Quelle, Quelle).
After centrifugation, the i-PRF fraction is drawn up and injected immediately. In the face, this is often done in a fan-like pattern along wrinkles or to treat the tear trough. For hair loss, multiple small depots are placed into the scalp. (Quelle, Quelle). An instructive video demonstrating the practical handling and typical injection patterns for i-PRF comes directly from the team around one of the developers of the A-PRF/i-PRF technique. (Quelle).
Immediately after the treatment, swelling, redness, and small hematomas are possible, which usually subside within a few days. Serious complications are rarely reported in most studies but, as with other injection therapies, primarily involve vascular or nerve injuries. (Quelle, Quelle). Most protocols use a series of three to six sessions spaced two to six weeks apart, followed by maintenance treatments after a few months, depending on the indication and response. (Quelle, Quelle).
Important Information for Patients
Anyone considering i-PRF should check if the practice has experience with autologous blood therapies and, ideally, with the specific indication (e.g., hair conditions, scars, periodontal defects). (Quelle, Quelle). Medical professional societies generally point out that for aesthetic treatments with biostimulators, careful indication, clarification about the experimental nature of many procedures, and clean documentation are necessary. (Quelle, Quelle).
Source: lipsandskin.de
i-PRF can be used in both men and women to promote hair growth.
It is advisable to request studies or summaries on your specific concern beforehand – for example, data on i-PRF for periorbital rejuvenation if dark circles are the primary issue, or current work on i-PRF for androgenetic alopecia if hair loss is the main concern. (Quelle, Quelle, Quelle).
Conclusion
i-PRF is a liquid fibrin preparation with high cell and growth factor density, obtained without additives, and showing significant regenerative effects in vitro and in initial clinical studies. (Quelle, Quelle, Quelle). Soft tissues are currently the best studied: skin, mucous membranes, and hair follicles benefit from improved healing, structure, and density in many studies, although the quality and size of these studies vary greatly. (Quelle, Quelle, Quelle).
At the same time, i-PRF is not a miracle cure. The evidence base is still limited for many indications, protocols are inconsistent, and the treatment should always be part of a sensible overall concept – whether in aesthetic dermatology, hair clinics, dentistry, or orthopedics. (Quelle, Quelle, Quelle). Patients should discuss their situation with an experienced specialist and use the available studies as a guide.