Platelet-rich plasma (PRP) is a procedure that uses your own blood to create a concentrated “platelet” layer (plasma rich in growth factors). A clinician injects this PRP into thinning scalp areas. In androgenetic alopecia (pattern hair loss), multiple randomized trials and meta-analyses suggest PRP can improve hair density (and sometimes thickness), but results vary because PRP methods are not standardized across clinics.
Medical note: This article is for general education and does not provide personal medical advice. PRP is a medical procedure. Avoid PRP if you have an active scalp infection (pustules/oozing), uncontrolled inflammatory scalp disease flare, or suspected scarring alopecia. If you have scalp pain/burning, pus, thick crusting, or rapidly worsening hair loss, start here: When to See a Doctor. For the full roadmap, start here: Hair Loss (Complete Guide).
Quick navigation
- Key takeaways (fast)
- What it is (plain English)
- Who it helps (and who it doesn’t)
- Protocol basics (what varies between clinics)
- Timeline: sessions → results → maintenance
- Side effects & troubleshooting
- Combining PRP with proven treatments
- FAQ
- References
Key takeaways (fast)
- Best-supported use: androgenetic alopecia (pattern hair loss) as an add-on treatment.
- What studies show: meta-analyses report PRP can increase hair density at around 3–6 months vs placebo in AGA.
- Biggest issue: protocols differ (platelet concentration, leukocyte-rich vs leukocyte-poor, activation, injection technique, session schedule), so results vary.
- Not a “one-and-done”: usually requires multiple sessions and maintenance.
- Safety: common effects are soreness, swelling, bruising, headache; infection is rare but possible if technique/hygiene is poor.
What PRP is (plain English)
PRP is made by drawing a small amount of your blood and spinning it in a centrifuge to separate layers. The platelet-rich layer contains growth factors that can support wound healing. In hair loss care, PRP is injected into thinning scalp zones to try to improve follicle function and hair growth parameters.
On our site, this topic fits under: Treatment Overview and Diagnosis & Care. If you’re not sure you have pattern hair loss, start with: How Hair Loss Is Diagnosed.
For pattern hair loss basics, see: Androgenetic Alopecia (Pattern Hair Loss).
Who it helps (and who it doesn’t)
Most supported use
- Androgenetic alopecia (AGA): PRP has the strongest evidence base here, especially for thinning zones (crown/mid-scalp) where follicles are miniaturized but still active.
When PRP is usually NOT the main answer
- Scarring alopecia: priority is controlling inflammation early. Hub: Scarring Alopecia.
- Classic telogen effluvium (triggered shedding): focus is identifying triggers and correcting them first. Read: Telogen Effluvium and Blood Tests & Workup.
- Active scalp infection or severe dermatitis flare: postpone until the scalp is stable.
Protocol basics (what varies between clinics)
PRP is not a single standardized product. These variables explain why results differ:
- Platelet concentration: different kits/spin protocols yield different platelet counts.
- Leukocytes: PRP may be leukocyte-rich or leukocyte-poor (inflammation profile differs).
- Activation: some protocols activate PRP (e.g., calcium) while others do not.
- Injection technique: depth, spacing, and total volume vary.
- Session schedule: number of sessions and intervals differ across studies and clinics.
Practical rule: choose a clinic that can clearly explain their protocol, sterile technique, and expected maintenance plan.
Timeline: sessions → results → maintenance
0–3 months: early changes may be subtle
Many studies evaluate early outcomes at around 3 months. Some people notice reduced shedding first, before visible density change.
3–6 months: common “evidence window”
Meta-analyses in AGA commonly report improved hair density around 3 and 6 months compared with placebo in controlled studies.
Maintenance
PRP is often described as a course of multiple sessions, followed by occasional maintenance. If you stop everything (including your base therapy), gains may fade over time.
Side effects & troubleshooting
Common short-term effects
- Soreness/tenderness for 1–3 days
- Mild swelling, redness, or bruising at injection sites
- Temporary headache or scalp tightness
Less common but important risks
- Infection: risk rises with poor sterile technique or needling/injecting through inflamed skin.
- Worsening dermatitis flare: can happen if the scalp is already inflamed.
- Vasovagal reaction: lightheadedness/fainting in needle-sensitive people.
Combining PRP with proven treatments
PRP usually performs best as an add-on to proven pattern-hair-loss therapy:
- Minoxidil base (common): Topical Minoxidil (How to Use) and, if needed and clinician-supervised, Low-Dose Oral Minoxidil.
- Men’s prescription options: Finasteride and, in selected cases, Dutasteride (off-label).
- Adjunct scalp foundation: if scale/itch is present, Ketoconazole Shampoo.
- Procedural “stacking”: some people combine PRP with Microneedling, but aggressive combinations can increase irritation—plan it with a clinician.
FAQ
Is PRP FDA-approved for hair loss?
PRP uses your own blood and is widely used in medicine, but PRP protocols for hair loss are not a single standardized FDA-approved “hair growth drug.” It’s best viewed as a clinician-performed procedure with varying protocols.
How many sessions do most people need?
Protocols vary. Many studies use multiple sessions over several months and then reassess. Ask the clinic to explain their exact schedule and maintenance plan.
Is PRP better than minoxidil?
Comparisons differ by study design. A 2025 meta-analysis compared PRP with topical minoxidil in AGA and discusses relative effects and safety; in practice, many clinicians use PRP as an add-on rather than a replacement.
Who is a poor candidate?
People with scarring alopecia, uncontrolled scalp inflammation, active infection, or mainly trigger-based shedding (telogen effluvium) often need a different primary plan.
References (trusted medical sources)
- American Academy of Dermatology (AAD): Hair loss—diagnosis and treatment (includes PRP overview)
- PubMed (2023): Meta-analysis — PRP increases hair density at 3 and 6 months vs placebo in AGA
- PubMed (2024): Meta-analysis — PRP combined with minoxidil in AGA
- PubMed (2025): Systematic review/meta-analysis — PRP vs topical minoxidil for AGA
- NIH/PMC (2023): Meta-analysis — PRP increases hair density in AGA (protocol variability discussed)
- PubMed (2020): Randomized trial — standardized PRP preparation in AGA (notes protocol challenges)
- DermNet NZ: Platelet-rich plasma—dermatological applications (hair loss section)
Last updated: February 22, 2026.
