Definition
In one sentence
PRF is an autologous (from-your-own-blood) concentrate of platelets, leukocytes, and fibrin that, when injected, releases growth factors gradually over approximately 10 days to drive tissue regeneration.
The "fibrin" in PRF is the key word. Fibrin is the structural protein of blood clots — a 3-D mesh that traps platelets and leukocytes. When PRF is prepared without anticoagulant additives, this mesh forms naturally during centrifugation. After injection, the mesh degrades slowly, releasing its trapped cargo over days. That sustained release is the whole point.
What's inside PRF
- Platelets — concentrated 2–3× over baseline blood. The cellular source of growth factors.
- Leukocytes — white blood cells. Drive immune-modulation and additional growth factor release. (Some protocols intentionally remove these; most aesthetic protocols keep them.)
- Fibrin matrix — the scaffold. Holds everything together; degrades gradually after injection.
- Plasma proteins — including albumin and clotting factors. In Alb-PRF specifically, heat-denatured albumin is used to create a denser, longer-lasting gel for volume.
- Stem-like cells — small numbers of mesenchymal stem cells and circulating progenitor cells, which may contribute to longer-term tissue effects.
The growth factors that do the work
Growth factors are signaling proteins. They tell cells what to do — proliferate, migrate, produce collagen, build new capillaries. PRF releases a coordinated cocktail:
| Factor | What it does |
|---|---|
| PDGF | Fibroblast proliferation, collagen synthesis |
| TGF-β1 | Extracellular matrix production, tissue repair coordination |
| VEGF | New capillary formation (angiogenesis) |
| EGF | Epithelial renewal, skin barrier repair |
| IGF-1 | Broad tissue regeneration; supports cell survival |
| BMP-2 / BMP-7 | Bone/tissue morphogenesis; relevant in dental/scar applications |
The clinically relevant point: it's not any single growth factor — it's the combination, delivered sustainably, that produces tissue remodeling.
How it's prepared
- Blood draw — typically 10–40 ml from a peripheral vein, into specialized tubes (glass or silica-coated) that allow clotting without anticoagulants.
- Centrifugation — protocol-specific. Modern horizontal centrifugation (per Dr. Miron) produces better cell yield and more uniform layering than older fixed-angle methods.
- Separation — the centrifuge produces visible layers: red blood cells at the bottom, a buffy coat (platelets + leukocytes), and a liquid plasma/fibrin layer on top.
- Collection — the PRF layer is drawn off, either as liquid (i-PRF), gel (Alb-PRF after heating with albumin), or solid clot (L-PRF for surgical use).
- Injection — within a short window (15–45 min depending on protocol) before the fibrin polymerizes too far.
The time pressure is real. PRF is prepared chairside and injected promptly — it doesn't sit on a shelf.
Why the fibrin matrix matters clinically
The biological difference between PRP and PRF can be summarized in one graph (not shown, but well-documented in the literature): PRP releases ~95% of its growth factors in the first hours after injection. PRF releases growth factors steadily over 10 days.
Why this matters for the tissue: cellular signaling that lasts 10 days produces sustained collagen synthesis, sustained angiogenesis, and a complete remodeling cycle. A 4-hour burst from PRP triggers an initial response but the signal is gone before the tissue finishes the work. This is the mechanistic reason behind the clinical observation that PRF outperforms PRP on most aesthetic indications.
FAQ
Is PRF the same as 'vampire facial'?
Vampire facial is a marketing term that originally referred to PRP applied topically after microneedling. The clinical concept survives but the modern version uses PRF — for the sustained-release reasons described above. If a clinic still uses 'vampire facial' to describe what they do, ask which protocol they're using.
Is the blood draw a problem if I'm anemic?
Mild anemia is usually fine. Severe anemia (Hgb < 10) reduces PRF cell yield and the resulting product is less effective. We discuss this in pre-treatment assessment.
How much blood is taken?
Typically 10–40 ml depending on what's being treated. Even the larger volumes are a small fraction of a routine blood test — no recovery time required.
Can PRF be frozen and saved for later?
No. The fibrin matrix begins polymerizing within minutes. PRF is prepared and used in the same session — it's not a stored product.
Want to know if this fits your case?
A short consultation clarifies whether PRF is the right tool — or whether a different approach fits better. No commitment.