PRP Therapy: A Complete Guide to Platelet-Rich Plasma Treatment

What Is PRP Therapy?

Platelet-rich plasma (PRP) therapy is a form of regenerative medicine that uses a concentrated preparation of your own blood platelets to accelerate healing in damaged tissues. The concept is straightforward: platelets are packed with growth factors and signaling proteins that your body naturally uses to repair injuries. PRP therapy simply delivers a much higher concentration of those platelets directly to the area that needs help.

The idea has been around since the 1980s, when PRP was first used in open-heart surgery to promote wound healing. Since then, it has expanded into orthopedics, sports medicine, dermatology, and aesthetics. Professional athletes were early adopters, and names like Tiger Woods, Rafael Nadal, and Kobe Bryant brought PRP into the mainstream conversation.

But PRP is not just for elite athletes. Today, it is used by people dealing with chronic tendon injuries, joint pain, hair thinning, and even facial aging. The question is not whether PRP is popular. The question is whether the science supports the hype.

In this guide, we will walk through exactly how PRP works at the cellular level, what conditions have the strongest evidence, how it compares to alternatives like cortisone and stem cells, what it costs, and how to decide if it is right for you.

How PRP Works: The Science Behind It

To understand PRP, you need to understand what platelets actually do. Most people think of platelets only as the blood cells that form clots when you get a cut. That is true, but it is only part of the story. Platelets are also loaded with bioactive proteins called growth factors that play a central role in tissue repair ^[1].

When you get injured, platelets rush to the site and release these growth factors, which do several things:

• Platelet-derived growth factor (PDGF): Stimulates cell replication and blood vessel formation
• Transforming growth factor beta (TGF-B): Promotes collagen synthesis and tissue remodeling
• Vascular endothelial growth factor (VEGF): Drives the formation of new blood vessels
• Epidermal growth factor (EGF): Stimulates cell growth and differentiation
• Insulin-like growth factor (IGF): Supports cell growth and muscle repair

Normal blood contains about 150,000 to 350,000 platelets per microliter. PRP concentrations are typically 3 to 5 times higher than baseline, though some preparation systems can achieve even greater concentrations ^[2]. The theory is that by flooding a damaged area with this concentrated cocktail of growth factors, you can jump-start the body’s natural repair process.

Beyond growth factors, platelets also release cytokines and chemokines that recruit stem cells and other repair cells to the injury site. This means PRP is not just delivering growth signals. It is also calling in reinforcements. The combination of direct growth factor stimulation and immune cell recruitment is what gives PRP its therapeutic potential.

It is worth noting that PRP also contains fibrinogen, which forms a fibrin scaffold at the injection site. This scaffold acts as a temporary matrix that supports cell migration and tissue rebuilding. Think of it as biological scaffolding that gives new tissue a structure to grow on.

The PRP Preparation Process

One of the things that makes PRP appealing is its simplicity. The entire process, from blood draw to injection, typically takes less than an hour. Here is what happens:

Step 1: Blood Draw

Your doctor draws a small amount of blood, usually between 15 and 60 milliliters (roughly 1 to 4 tablespoons). This is similar to a routine blood test.

Step 2: Centrifugation

The blood sample goes into a centrifuge, a machine that spins the blood at high speed. This separates the blood into layers: red blood cells settle at the bottom, a “buffy coat” of platelets and white blood cells forms in the middle, and platelet-poor plasma rises to the top. The platelet-rich layer is carefully extracted.

Step 3: Activation (Sometimes)

Some protocols add calcium chloride or thrombin to the PRP to “activate” the platelets before injection. Others skip this step and let the platelets activate naturally once they contact the damaged tissue. There is still debate about which approach is better ^[3].

Step 4: Injection

The concentrated PRP is injected directly into the injured area. For joints and tendons, ultrasound guidance is often used to ensure accurate placement. For scalp injections (hair loss treatment), the PRP is injected across multiple sites in the thinning area.

A Note on PRP Variability

Not all PRP is created equal. Different centrifuge systems, spin speeds, and preparation protocols produce different concentrations and compositions. Some PRP preparations are “leukocyte-rich” (containing white blood cells), while others are “leukocyte-poor.” This variability is one of the biggest challenges in PRP research, because two studies labeled “PRP therapy” may be using very different products ^[4].

Conditions Treated with PRP

Knee Osteoarthritis

This is where PRP has some of its strongest evidence. Multiple meta-analyses have found that PRP injections provide greater pain relief and functional improvement than hyaluronic acid (viscosupplementation) or saline placebo injections in patients with mild to moderate knee osteoarthritis ^[5].

A 2019 meta-analysis published in the American Journal of Sports Medicine analyzed 18 randomized controlled trials and concluded that PRP was superior to hyaluronic acid and placebo at 6 and 12 months for both pain reduction and functional outcomes ^[6]. That said, PRP does not reverse cartilage damage, and results tend to diminish after 12 to 18 months, which is why repeat treatments are common.

Tennis Elbow (Lateral Epicondylitis)

Chronic lateral epicondylitis is another area with encouraging data. A well-known 2014 study in the American Journal of Sports Medicine compared PRP to cortisone injections and found that while cortisone provided better short-term relief, PRP patients had significantly better outcomes at 1 and 2 years ^[7]. This makes sense when you consider that cortisone reduces inflammation but may actually weaken tendon tissue over time, while PRP aims to promote actual healing.

Rotator Cuff Injuries

The evidence here is more mixed. Some studies suggest PRP can improve healing rates after rotator cuff repair surgery, while others show no significant benefit ^[8]. PRP may be most helpful for partial-thickness tears treated conservatively (without surgery), but we need more high-quality trials to say this with confidence.

Hair Loss (Androgenetic Alopecia)

PRP for hair loss has gained significant traction, and the research is reasonably supportive. A 2019 systematic review found that PRP injections increased hair count and hair thickness in patients with androgenetic alopecia compared to placebo ^[9]. Most protocols involve 3 to 4 monthly treatments followed by maintenance sessions every 3 to 6 months. Results are best for people with early to moderate hair thinning rather than complete baldness.

Facial Rejuvenation (The “Vampire Facial”)

PRP has become popular in aesthetics, often combined with microneedling for facial rejuvenation. The idea is that the growth factors in PRP stimulate collagen production and improve skin texture. While there are some positive studies showing improvements in skin tone and wrinkle depth, the evidence base here is thinner than for orthopedic applications ^[10]. Much of the enthusiasm is driven by celebrity endorsement rather than rigorous clinical data.

Plantar Fasciitis

Chronic plantar fasciitis that has not responded to conservative treatment (rest, stretching, orthotics) is another area where PRP shows promise. A 2018 meta-analysis found that PRP was more effective than cortisone injections for plantar fasciitis at follow-up periods beyond 3 months. Cortisone gave faster initial relief, but PRP produced better outcomes over time. The pattern here mirrors what we see with tennis elbow: cortisone wins the short game, but PRP appears to win the long game.

Achilles Tendinopathy

Results for Achilles tendon problems have been inconsistent. Some studies show meaningful improvement, while others show no significant difference compared to placebo or eccentric exercise programs alone. The Dutch KNAW trial, one of the largest studies on PRP for Achilles tendinopathy, found no benefit over placebo. This may relate to the type of PRP used (leukocyte-rich preparations may actually increase inflammation in tendons) or the specific nature of the Achilles injury being treated.

Other Applications

PRP is also being studied for ACL reconstruction healing, chronic wounds, dental and oral surgery applications, and post-surgical recovery. The evidence varies widely by condition. Some surgeons apply PRP during knee replacement surgery or ACL reconstruction to promote faster tissue healing, though the data on surgical augmentation is still evolving.

PRP vs. Cortisone Injections

This is one of the most common comparisons patients ask about. Here is how they differ:

Cortisone is a corticosteroid that reduces inflammation. It works quickly, often providing relief within days. But cortisone does not heal anything. It suppresses the inflammatory response, which is useful for acute flare-ups but potentially problematic for chronic conditions. Repeated cortisone injections have been linked to cartilage degradation and tendon weakening ^[11].

PRP takes a different approach. Instead of suppressing inflammation, it introduces concentrated growth factors to promote tissue repair. It works more slowly (you may not notice improvement for 4 to 6 weeks), but the goal is actual healing rather than symptom masking.

For acute inflammation that needs fast relief, cortisone has its place. For chronic tendon problems and mild to moderate osteoarthritis where you want a longer-term solution, PRP may be the better choice. Some clinicians use both strategically: cortisone for short-term relief and PRP for longer-term healing.

PRP vs. Stem Cell Therapy

Stem cell therapy is sometimes presented as the “next level up” from PRP, but the comparison is not that simple.

PRP contains growth factors and signaling molecules but no stem cells. Stem cell injections (typically using bone marrow aspirate concentrate or adipose-derived stem cells) contain mesenchymal stem cells that can potentially differentiate into cartilage, bone, or other tissues.

In theory, stem cell therapy has greater regenerative potential. In practice, the evidence for stem cell injections is still limited, and the treatments cost significantly more ($3,000 to $10,000+). Some clinics combine PRP with stem cell therapy, using PRP as a “booster” to support the stem cell graft ^[12].

For most patients, starting with PRP is a reasonable first step. If PRP does not provide adequate relief, stem cell therapy can be considered, though it is important to have realistic expectations and to choose a provider who is transparent about the current state of the evidence.

One important distinction: PRP is relatively well-standardized compared to stem cell therapies. We know what is in PRP (concentrated platelets and growth factors from your blood). With stem cell therapies, the number of viable stem cells delivered can vary dramatically depending on the source, processing method, and the patient’s age and health. An older patient’s bone marrow concentrate may contain far fewer active stem cells than a younger patient’s.

PRP vs. Prolotherapy

Prolotherapy (proliferative therapy) involves injecting an irritant solution, usually dextrose (sugar water), into damaged ligaments or tendons. The irritant triggers a controlled inflammatory response that is meant to stimulate healing.

PRP and prolotherapy share the same basic philosophy: stimulate the body’s healing response rather than suppress symptoms. But PRP delivers specific growth factors, while prolotherapy relies on a nonspecific inflammatory stimulus.

Prolotherapy is significantly cheaper than PRP (often $100 to $300 per session) and has been used for decades. The evidence base for prolotherapy is modest but generally positive for conditions like chronic low back pain and knee osteoarthritis ^[13]. Some practitioners view PRP as a more refined version of the same concept. Others consider them complementary treatments.

How Many Sessions Do You Need?

This depends on the condition being treated and how your body responds:

• Knee osteoarthritis: Most protocols call for 1 to 3 injections spaced 2 to 4 weeks apart. Benefits may last 6 to 18 months, and repeat treatment courses are common.
• Tendon injuries (tennis elbow, Achilles tendinopathy): Typically 1 to 2 injections. Some patients respond to a single injection; others need a second.
• Hair loss: Usually 3 to 4 monthly sessions initially, followed by maintenance every 3 to 6 months.
• Facial rejuvenation: 3 sessions spaced 4 to 6 weeks apart, with maintenance 1 to 2 times per year.

Your provider should discuss a treatment plan before you start and set clear expectations about the likely timeline for results.

Recovery Timeline

One of PRP’s advantages is the minimal downtime:

• Day 1 to 3: Mild to moderate soreness, swelling, and possibly bruising at the injection site. This is normal and expected.
• Week 1 to 2: Soreness gradually fades. Avoid anti-inflammatory medications (like ibuprofen or naproxen) during this period, as they can interfere with the platelet-driven healing process.
• Week 2 to 6: Gradual improvement begins. For orthopedic conditions, you may start noticing reduced pain and better function.
• Month 2 to 3: Maximum benefit is typically reached around this time for musculoskeletal conditions.

Most providers recommend avoiding strenuous exercise for 1 to 2 weeks after injection but allow light activity and daily tasks immediately. Ice can be used for comfort, though some clinicians prefer heat to support the inflammatory healing response.

An important note about anti-inflammatory medications: avoid NSAIDs (ibuprofen, naproxen, aspirin) for at least one to two weeks before and after your PRP injection. These drugs inhibit platelet function and can reduce the effectiveness of the treatment. If you need pain relief, acetaminophen (Tylenol) is generally considered safe because it does not affect platelet activity. Ask your provider for specific guidance on medication management around your treatment.

Cost and Insurance Coverage

PRP therapy typically costs between $500 and $2,500 per injection. The price varies based on:

• Geographic location (major cities tend to be more expensive)
• Provider experience and credentials
• The preparation system used
• Whether ultrasound guidance is included
• The specific condition being treated

Insurance coverage for PRP is rare. Most insurance companies classify PRP as “experimental” or “investigational,” meaning you will likely pay out of pocket. A few exceptions exist for specific orthopedic indications in certain states, but do not count on coverage. Always get a clear cost estimate before treatment and ask about package pricing if multiple sessions are recommended.

What the Research Actually Shows, by Condition

Let’s be honest about where the evidence stands:

Strong evidence (positive): Knee osteoarthritis (mild to moderate). Multiple high-quality meta-analyses support PRP over hyaluronic acid and placebo ^[5][6].

Moderate evidence (positive): Lateral epicondylitis. Several RCTs show PRP outperforms cortisone at long-term follow-up ^[7]. Androgenetic alopecia. Consistent positive results across multiple studies, though optimal protocols are still being defined ^[9].

Mixed evidence: Rotator cuff tears (some positive, some neutral), Achilles tendinopathy (inconsistent results), plantar fasciitis (small positive studies but limited data) ^[8].

Weak or insufficient evidence: Facial rejuvenation (mostly small, low-quality studies), chronic muscle injuries, post-surgical healing enhancement.

A major limitation across all PRP research is the lack of standardization. Studies use different PRP preparations, concentrations, injection techniques, and outcome measures. This makes it difficult to draw firm conclusions even when individual studies look promising ^[14]. The field needs large, well-designed trials with standardized PRP protocols.

How to Choose a PRP Provider

If you decide to try PRP, choosing the right provider matters. Here is what to look for:

1. Medical credentials: Look for board-certified physicians in orthopedics, sports medicine, physical medicine and rehabilitation (PM&R), or dermatology (for aesthetic/hair applications). Be cautious of non-physician providers or med spas offering PRP without physician oversight.
2. Experience with PRP: Ask how many PRP procedures they have performed and for which conditions. You want someone who does this regularly, not occasionally.
3. Image guidance: For joint and tendon injections, your provider should be using ultrasound guidance. Blind injections are less accurate and may be less effective.
4. Transparent about limitations: A good provider will discuss what PRP can and cannot do, set realistic expectations, and be honest about the evidence for your specific condition.
5. Clear pricing: Avoid clinics that are vague about costs or pressure you into expensive treatment packages. You should know the total expected cost before starting.
6. Preparation system: Ask what system they use to prepare the PRP and what concentration they target. This shows they are paying attention to the details that affect outcomes.

Side Effects and Risks

Because PRP comes from your own blood, the risk of allergic reaction or disease transmission is essentially zero. The most common side effects are:

• Pain at the injection site (very common, usually resolves in days)
• Swelling and bruising
• Temporary stiffness in the treated joint
• Infection (very rare, as with any injection)
• Nerve or tissue damage (rare, minimized with ultrasound guidance)

PRP is generally considered very safe. The main “risk” is financial: spending a significant amount of money on a treatment that may not work for your particular situation.

Who Should Avoid PRP?

PRP is not appropriate for everyone. You should generally avoid PRP therapy if you have:

• Active infection in or near the treatment area
• Blood disorders such as thrombocytopenia (low platelet count) or platelet dysfunction syndromes
• Active cancer or a recent cancer diagnosis (growth factors could theoretically stimulate cancer cell growth, though this has not been proven)
• Blood-thinning medications that cannot be safely paused (discuss with your prescribing physician)
• Severe anemia or other conditions that would make blood draw inadvisable
• Systemic sepsis or acute illness

Pregnancy is also generally considered a contraindication, not because PRP is known to be harmful during pregnancy, but because it has not been studied in pregnant populations.

How to Prepare for Your PRP Appointment

Preparation for PRP therapy is relatively simple, but following these guidelines can improve your results:

• Stop NSAIDs (ibuprofen, naproxen, aspirin) at least 5 to 7 days before treatment. Some providers recommend stopping 2 weeks prior.
• Stop blood thinners if medically safe to do so (always coordinate with the prescribing physician first).
• Stay hydrated. Drink plenty of water in the 24 hours before your appointment. Good hydration makes for a better blood draw and may improve platelet quality.
• Eat a normal meal before your appointment. Coming in fasted can make you lightheaded during the blood draw.
• Avoid alcohol for at least 48 hours before treatment, as alcohol can affect platelet function.
• Get adequate sleep. Your body produces and maintains platelets more effectively when well-rested.

After the injection, plan for a quiet day. While most people can return to normal activities within 24 hours, you will want to take it easy for the rest of that day and avoid intense physical activity for one to two weeks.

Frequently Asked Questions

Does PRP hurt?

The blood draw feels like any standard blood test. The injection itself can be uncomfortable, especially for joint injections. Most providers use a local anesthetic (lidocaine) to numb the area before injecting the PRP. Scalp injections for hair loss can be mildly painful due to the number of injection sites, but topical numbing cream is usually applied beforehand.

How soon will I see results?

Do not expect immediate improvement. PRP works by stimulating your body’s healing processes, and that takes time. Most patients notice gradual improvement starting around 4 to 6 weeks after injection, with maximum benefit typically reached at 2 to 3 months.

Can PRP be combined with other treatments?

Yes. PRP is often used alongside physical therapy for musculoskeletal conditions, and this combination may produce better results than either treatment alone. For hair loss, PRP is sometimes combined with minoxidil or finasteride. For facial rejuvenation, PRP is commonly paired with microneedling. Talk to your provider about the best combination approach for your goals.

Is there an age limit for PRP?

There is no strict age limit. However, platelet concentration and growth factor content may decrease with age, which could reduce effectiveness in older patients. PRP is most commonly used in adults between 30 and 70 years old.

The Bottom Line on PRP Therapy

PRP therapy is a legitimate medical treatment with a solid biological rationale and growing clinical evidence. It is not a miracle cure, and it does not work for everyone. But for certain conditions, particularly mild to moderate knee osteoarthritis, chronic tennis elbow, and early hair loss, the evidence supports PRP as a reasonable treatment option.

If you are considering PRP, start by having an honest conversation with a qualified provider about whether it makes sense for your specific situation. Ask about the evidence for your condition, what outcomes you can realistically expect, and what the total cost will be. And remember that PRP is most effective as part of a broader treatment plan that includes physical therapy, exercise, and lifestyle modifications.

References

1. Marx RE. Platelet-rich plasma: evidence to support its use. J Oral Maxillofac Surg. 2004;62(4):489-496. doi:10.1016/j.joms.2003.12.003
2. Dhurat R, Sukesh M. Principles and methods of preparation of platelet-rich plasma: a review and author’s perspective. J Cutan Aesthet Surg. 2014;7(4):189-197. doi:10.4103/0974-2077.150734
3. DeLong JM, Russell RP, Mazzocca AD. Platelet-rich plasma: the PAW classification system. Arthroscopy. 2012;28(7):998-1009. doi:10.1016/j.arthro.2012.04.148
4. Chahla J, Cinque ME, Piuzzi NS, et al. A call for standardization in platelet-rich plasma preparation protocols and composition reporting. J Bone Joint Surg Am. 2017;99(20):1769-1779. doi:10.2106/JBJS.16.01374
5. Belk JW, Kraeutler MJ, Houck DA, Goodrich JA, Dragoo JL, McCarty EC. Platelet-rich plasma versus hyaluronic acid for knee osteoarthritis: a systematic review and meta-analysis. Am J Sports Med. 2021;49(1):249-260. doi:10.1177/0363546520909397
6. Filardo G, Previtali D, Napoli F, Candrian C, Zaffagnini S, Grassi A. PRP injections for the treatment of knee osteoarthritis: a meta-analysis of randomized controlled trials. Cartilage. 2021;13(1_suppl):364S-375S. doi:10.1177/1947603520931170
7. Gosens T, Peerbooms JC, van Laar W, den Oudsten BL. Ongoing positive effect of platelet-rich plasma versus corticosteroid injection in lateral epicondylitis. Am J Sports Med. 2011;39(6):1200-1208. doi:10.1177/0363546510397173
8. Cai YZ, Zhang C, Lin XJ. Efficacy of platelet-rich plasma in arthroscopic repair of full-thickness rotator cuff tears: a meta-analysis. J Shoulder Elbow Surg. 2015;24(12):1852-1859. doi:10.1016/j.jse.2015.07.035
9. Giordano S, Romeo M, di Summa PG. A meta-analysis on evidence of platelet-rich plasma for androgenetic alopecia. Int J Trichology. 2018;10(1):1-10. doi:10.4103/ijt.ijt_74_16
10. Emer J. Platelet-rich plasma (PRP): current applications in dermatology. Dermatol Surg. 2019;45(10):1219-1233. doi:10.1097/DSS.0000000000002036
11. Dean BJF, Lostis E, Oakley T, Rombach I, Morrey ME, Carr AJ. The risks and benefits of glucocorticoid treatment for tendinopathy: a systematic review of the effects of local glucocorticoid on tendon. Semin Arthritis Rheum. 2014;43(4):570-576. doi:10.1016/j.semarthrit.2013.08.006
12. Centeno C, Pitts J, Al-Sayegh H, Freeman M. Efficacy of autologous bone marrow concentrate for knee osteoarthritis with and without adipose graft. Biomed Res Int. 2014;2014:370621. doi:10.1155/2014/370621
13. Rabago D, Patterson JJ, Mundt M, et al. Dextrose prolotherapy for knee osteoarthritis: a randomized controlled trial. Ann Fam Med. 2013;11(3):229-237. doi:10.1370/afm.1504
14. Le ADK, Enweze L, DeBaun MR, Dragoo JL. Current clinical recommendations for use of platelet-rich plasma. Curr Rev Musculoskelet Med. 2018;11(4):624-634. doi:10.1007/s12178-018-9527-7
15. Gentile P, Garcovich S. Systematic review of platelet-rich plasma use in androgenetic alopecia compared with Minoxidil and Finasteride. J Cosmet Dermatol. 2020;19(1):2-9. doi:10.1111/jocd.13033
16. Kon E, Di Matteo B, Delgado D, et al. Platelet-rich plasma for the management of knee osteoarthritis: a systematic review of clinical evidence. Expert Opin Biol Ther. 2021;21(6):775-785. doi:10.1080/14712598.2021.1879769
17. Peptide Therapy Guide: What You Need to Know
18. NAD+ Dosage Guide: IV, Injection, and Oral Protocols Compared
19. GAINSWave Therapy for ED: How Shockwave Treatment Works
20. Ketamine for Chronic Pain: How NMDA Antagonism Breaks the Pain Cycle

About the medical reviewer

Dr. Bronwyn Holmes, MD, FAARFM is a physician specialising in regenerative medicine, advanced peptide therapeutics, exosome and stem cell biology, hormonal health, and longevity. Last reviewed July 5, 2026.