How PRP (Platelet-Rich Plasma) Actually Heals Your Skin and Hair

Medically reviewed by Dr. Dan Xu, M.D., CCFP — CPSO Licensed Physician and Founder & Medical Director of ID Cosmetic Clinic, Markham. Last updated June 2026.

“How does PRP actually work?” is one of the most common questions we hear in our Markham clinic — usually right after someone has been told it can regrow hair or refresh aging skin and (understandably) wants to know whether that is real biology or marketing. The short version is that it is real biology, but it is not magic: PRP simply takes a healing process your body already runs and concentrates it. This article walks through exactly how PRP is made, what is inside it, what it can and cannot treat, what results and downtime to expect, and how it compares to the newer PRF. This is general information, not medical advice.

PRP at a glance

What PRP is (and is not)

PRP stands for platelet-rich plasma. It is a concentrated portion of your own blood, prepared fresh in the clinic on the day of treatment. It is not a drug, not a synthetic compound, and not a donor product — every active ingredient in PRP already exists inside your body. That is the whole appeal: because it is autologous (from you), the chance of an allergic or rejection reaction is extremely low.

Platelets are best known for clotting, but they do something just as important: when tissue is injured, platelets rush to the site and release a burst of growth factors that kick off the repair program — recruiting cells, building new collagen, and forming new blood vessels. PRP borrows that natural process. Instead of waiting for an injury, we concentrate your platelets and deliver them precisely to the tissue you want to rebuild: the dermis of aging skin, or the dermal papilla region of thinning hair follicles. Over the last two decades this idea has moved from sports medicine (healing tendons and joints) into dermatology and hair restoration.

How PRP works — step by step

The process is standardized, but small details determine the final platelet concentration and growth-factor content. Here is what actually happens during a session.

Step 1 — A small blood draw

The physician or nurse draws a modest amount of blood — usually 20 to 60 mL — from a vein in your arm, into tubes containing an anticoagulant (sodium citrate) so the blood does not clot before it is processed. This is the same kind of draw you would have for routine bloodwork.

Step 2 — Centrifugation separates the layers

The tubes are spun in a centrifuge. Spinning sorts the blood by density into distinct layers: red blood cells at the bottom, a thin whitish “buffy coat” of white cells and platelets in the middle, and platelet-poor plasma on top. Many protocols use a two-spin method — a first lower-speed spin to separate the layers, then a second higher-speed spin to concentrate the platelets further and remove excess plasma.

Step 3 — The platelet-rich layer is collected

The red cells and excess plasma are removed, and the platelet-rich layer is drawn off. The finished PRP typically contains platelets at roughly 3 to 8 times their normal blood concentration, in a volume that is about 10–20% of the original draw. The aim is a meaningful concentration — not simply “more is better,” because excessively high concentrations are not necessarily more effective.

Step 4 — Activation releases the growth factors

Platelets only release their growth factors once they are activated. There are a few ways to trigger this: adding calcium chloride (which mimics natural clotting), adding thrombin for fast release, or relying on natural activation — simply letting the platelets contact your own collagen once injected into tissue. Natural activation is slower but is considered closest to physiological conditions. The right approach depends on the treatment area and goal.

Step 5 — Precise delivery to the target tissue

The activated PRP is delivered exactly where repair is wanted. For skin, that means injecting or microneedling it into the dermis. For hair, it is injected into the follicle layer of the scalp, roughly 3–4 mm deep, around the dermal papilla. From there, the released growth factors do the work over the following weeks. The whole preparation usually takes 30–45 minutes, and PRP is used immediately — it is not stored.

The growth factors — and what each one does

Platelets themselves do not “treat” tissue. The real workers are the growth factors stored in the platelets’ alpha granules. When platelets activate, those granules release their contents and trigger a cascade of cell signals. The main players:

• PDGF (platelet-derived growth factor): a powerful stimulant that prompts fibroblasts to multiply and build new collagen and tissue matrix. One of the most abundant growth factors in PRP.
• VEGF (vascular endothelial growth factor): drives angiogenesis — the formation of new blood vessels — improving local blood supply and nutrient delivery. This is especially important on the scalp, because a follicle’s blood supply directly affects its vitality.
• EGF (epidermal growth factor): promotes the growth and renewal of skin surface cells, contributing directly to smoother texture.
• TGF-β (transforming growth factor beta): regulates inflammation (calming excessive inflammation) and helps rebuild the extracellular matrix during healing.
• IGF (insulin-like growth factor): supports cell growth and survival, and in the hair cycle can help extend the growth (anagen) phase so follicles stay productive longer.

These factors do not work in isolation. PDGF recruits fibroblasts, TGF-β then fine-tunes how much collagen they produce; VEGF lays down new blood vessels, and IGF and EGF use that improved blood supply to keep nourishing the target tissue. It is this synergy — many signals acting together — that makes PRP’s effect systemic rather than a single linear response.

What PRP does for skin

For skin, PRP’s goal is to restart collagen production and vascular renewal in the dermis — two functions that decline first as skin ages.

Rebuilding collagen and elastin

PDGF and TGF-β stimulate dermal fibroblasts to synthesize more type I and type III collagen plus elastin. This is not an instant effect: new collagen typically takes 4 to 8 weeks to show up clinically as firmer skin and softer fine lines, and repeated sessions build on each other to rebuild dermal structure at a deeper level.

Better blood supply, better-nourished skin

The new vessel network prompted by VEGF improves microcirculation, meaning more oxygen and nutrients reach the skin — which supports a healthier, brighter complexion and provides the raw materials for ongoing repair.

Calmer, more even skin

Through TGF-β’s anti-inflammatory action, PRP can also offer some supportive benefit for mildly inflammatory conditions, such as the lingering redness after acne has healed.

“Skin booster” PRP and combination treatments

Diluted PRP can be delivered broadly across the face through fine injections to improve overall hydration, radiance and texture uniformity — rather than targeting one specific wrinkle. PRP is also frequently combined with other treatments: applying or injecting PRP immediately after RF microneedling or a picosecond laser uses the micro-channels those treatments create to improve PRP absorption and amplify the repair effect. (At ID Cosmetic Clinic, RF microneedling is performed with comparable physician-grade technology such as Lutronic Genius / Sylfirm X.)

What PRP does for hair

Hair restoration is one of the most evidence-supported uses of PRP, particularly for androgenetic alopecia (pattern hair loss). The mechanism overlaps with skin treatment, but the target is different.

Dermal papilla and new blood vessels

Dermal papilla cells control the follicle’s life cycle. When PRP is injected into the follicle layer of the scalp, VEGF stimulates new blood vessels around the papilla, increasing the nutrient and oxygen supply each follicle receives. Improved blood supply is one of the conditions a shrinking follicle needs in order to recover activity.

Resetting the hair cycle

Hair cycles through growth (anagen), transition (catagen) and resting (telogen) phases. A hallmark of pattern hair loss is that follicles enter the resting phase too early and the growth phase shortens. IGF and PDGF in PRP act on dermal papilla cells to help:

• nudge resting follicles back into the growth phase;
• extend how long the growth phase lasts; and
• increase follicle density (more active follicles per square centimetre).

What patients typically notice

With a proper course of scalp PRP, the changes clinicians observe usually include reduced shedding, thicker individual hair shafts, and a visual improvement in overall density. It is important to be honest about the limits: PRP does little for follicles that have already fully scarred and shrunk away. The earlier the treatment window, the better the result — which is why we encourage people not to wait until thinning is advanced.

PRP vs PRF — what’s the difference?

PRF (platelet-rich fibrin) is a refined version of PRP. It is prepared without an anticoagulant and with a single, lower-speed spin, so the blood is allowed to clot naturally into a fibrin scaffold that holds platelets, white cells and growth factors.

The key difference is release kinetics. Activated PRP releases its growth factors in a concentrated burst over a few hours. PRF’s fibrin scaffold acts as a slow-release reservoir, leaking growth factors steadily over days to weeks — extending how long the target tissue is stimulated. PRF also contains no added ingredients (no anticoagulant, no separate activator), so it is considered fully autologous. In practice, PRP flows more easily and suits broad, even coverage, while PRF suits situations that benefit from prolonged action — and the two can be combined. Which one fits you is a clinical decision made at consultation.

Who PRP is for — and who should be cautious

PRP is a good fit for people with early-to-moderate hair thinning, dull or aging skin, fine lines and texture concerns, or those wanting to support healing after another treatment. Because it uses your own blood, it suits patients who prefer a “natural,” low-allergy option.

It is not the right tool for everyone. PRP cannot revive follicles that are completely scarred, and it is not a substitute for surgery in advanced hair loss. You should avoid or postpone PRP, or discuss it carefully first, if you have a clotting or platelet disorder, are taking blood thinners or anticoagulant medication, have an active infection or skin condition at the treatment site, certain blood-borne conditions or active cancer, or are pregnant or breastfeeding. To reduce bruising, it is generally advised to pause aspirin and ibuprofen-type medications for about a week beforehand (only on your physician’s guidance) and to avoid strenuous exercise and hot baths on the day of treatment. A proper medical consultation screens for all of this before any needle is used. This article is general information, not medical advice.

The real takeaway

PRP is not a miracle injection and it is not snake oil — it is a way to concentrate and re-deploy a repair process your body already knows how to run. Its results are gradual, build over weeks to months, and depend heavily on choosing the right candidate, the right depth, and a careful preparation protocol. Used well, it is a low-downtime, low-allergy option for early hair thinning and skin renewal. Used as a cure-all, it disappoints. The honest version is the one worth having.

Frequently asked questions

How does PRP work in simple terms?

A small amount of your blood is spun in a centrifuge to concentrate the platelets. Those platelets are activated to release growth factors, which are delivered into your skin or scalp to signal new collagen, new blood vessels and — for hair — renewed follicle activity. The active ingredients all come from you.

Is PRP safe?

For most healthy people, yes. Because PRP is made from your own blood, allergic or rejection reactions are very rare. The main risks are minor: temporary redness, swelling or bruising at the injection site. People with clotting disorders, on blood thinners, with active infection, or who are pregnant or breastfeeding should discuss it with a physician first.

How long does PRP take to work?

It is gradual. For skin, new collagen typically becomes visible over about 4 to 8 weeks. For hair, meaningful change usually takes 3 to 6 months, because hair follicles need time to move from the resting phase back into a visible growing phase.

What’s the difference between PRP for skin and PRP for hair?

The preparation is similar; the injection site, depth and concentration differ. Skin PRP is delivered into the dermis to improve texture, tone and hydration. Scalp PRP is injected into the follicle layer (about 3–4 mm deep) to stimulate follicle activity and the blood vessels around it.

How many PRP sessions will I need?

A common starting course is 3 to 4 sessions about 4 weeks apart, with results assessed roughly 3 months after the last session, followed by periodic maintenance. The exact plan depends on your goal and how your skin or hair responds.

Does PRP hurt, and is there downtime?

Discomfort is generally mild, and numbing cream is used for sensitive areas. Downtime is minimal — you may have redness, mild swelling or some bruising for 24 to 48 hours, plus mild scalp tenderness on the day of a hair treatment.

What’s the difference between PRP and PRF?

PRF (platelet-rich fibrin) is made without anticoagulant and with a gentler spin, forming a fibrin scaffold that releases growth factors slowly over days to weeks, versus PRP’s faster burst. PRF is fully additive-free; PRP flows more easily for broad coverage. They can also be combined.

Can PRP regrow hair on a completely bald area?

No. PRP can revitalize follicles that are miniaturizing or thinning, but it cannot bring back follicles that have already fully scarred and disappeared. It works best when hair loss is recent and not yet advanced, and for pattern hair loss it often works better alongside medications such as minoxidil under medical guidance.

Is PRP better with other treatments?

Often, yes. PRP pairs well with RF microneedling or laser, where the micro-channels created improve PRP absorption and the two effects reinforce each other. Whether combining is right for you is decided at consultation.

Related at ID Cosmetic Clinic

• Treatment: PRP Hair Restoration
• Treatment: PRP Facial / Skin Rejuvenation
• Treatment: RF Microneedling
• Condition: Hair Loss & Thinning
• Compare: PRP vs PRF: Which Is Right for You?
• Read next: PRP for Hair Loss: What Results to Expect, Month by Month