PRP Injections for Hair Regrowth

Hair loss and thinning hair are among the most common reasons patients visit the dermatologist’s office, affecting an estimated 50 million men and 30 million women at some point in their lives. Hair loss can stem from a wide range of causes, including genetic conditions such as androgenetic alopecia (also known as androgenic alopecia, male pattern baldness, or female pattern baldness), autoimmune conditions like alopecia areata, hormonal changes, certain medications, or acute stress. Regardless of the underlying cause, a visible decrease in hair density and thickness can be distressing, and patients deserve an accurate diagnosis and an individualized treatment plan from an experienced board-certified dermatologist such as Dr. Michele Green.

Platelet-rich plasma (PRP) therapy is among the most effective options for patients seeking hair regrowth without surgery. By concentrating the growth factors and cytokines naturally present in a patient’s own blood, PRP therapy helps repair damaged hair follicles, improve hair density, and stimulate new hair growth. PRP has long been used in regenerative medicine for tissue repair, wound healing, and orthopedic injuries, and it has become a mainstay of modern hair restoration for hair loss, often paired with complementary treatments such as minoxidil, finasteride, and microneedling for optimal results. With minimal risk of allergic reaction and a strong safety profile, PRP injections have become a trusted option for men and women working with Dr. Michele Green to restore fuller, healthier-looking hair.

Dr. Michele Green is an internationally recognized, board-certified dermatologist who has treated patients at her private practice on Manhattan’s Upper East Side for more than 25 years. An expert in a wide range of medical and cosmetic treatments, Dr. Green is known for her proficiency in Botox, dermal fillers, laser therapy, microneedling, and PRP hair treatment, among other services. She is consistently recognized as one of New York City’s top healthcare providers by publications including Castle Connolly, New York Magazine, and Super Doctors, reflecting her dedication to individualized, results-driven patient care.

Why does hair loss occur?

Hair loss can develop for many reasons, including genetic predisposition, hormonal changes, acute stress or injury, certain medications, and autoimmune disorders such as alopecia areata. The most common cause is androgenetic alopecia, colloquially known as male or female pattern baldness. Elevated androgen levels shorten the hair cycle and gradually damage hair follicles, leading to shedding and a visible decrease in hair thickness over time. In men, androgenetic alopecia typically produces a receding hairline and balding at the crown, while in women, it often causes diffuse thinning and a widening part. Because the right treatment depends on identifying the specific cause of hair loss, Dr. Green begins every hair restoration consultation with a thorough evaluation of the scalp and hair growth pattern.

What is platelet-rich plasma treatment (PRP treatment)?

PRP treatment uses autologous plasma — drawn from the patient’s own blood — which is centrifuged to separate platelet-rich plasma from platelet-poor plasma and red blood cells. Once isolated, this high concentration of platelets, growth factors, and cytokines is injected into the treatment area, where it promotes healing, supports tissue repair, reduces inflammation, and stimulates the growth of new cells. Because PRP therapy uses the patient’s own blood, the risk of an allergic reaction is very low, making it a safe and effective option for skin rejuvenation, musculoskeletal healing, and hair regrowth alike.

How does PRP therapy work for hair loss treatment?

When injected into the scalp, the high platelet concentration in PRP activates growth factors at the injection site, improving blood flow and triggering the repair of damaged hair follicles. This process strengthens the hair shaft, extends the hair cycle’s growth phase, and reactivates dormant hair follicles that have stopped producing hair. Over time, patients see thicker, denser hair and reduced hair shedding. PRP therapy can be used alone or in combination with other treatments, including finasteride, minoxidil, microneedling, or hair transplant surgery, to further improve results.

To inject PRP for hair regrowth, Treatment begins with a simple blood draw, after which the blood is centrifuged to separate it into red blood cells, platelet-poor plasma, and platelet-rich plasma. The injections themselves take less than 30 minutes. Because the treatment uses the patient’s own blood, there is essentially no downtime, allowing patients to return to their normal activities immediately afterward.

Many patients ask how many PRP injections are needed for hair regrowth and what the recovery time is after PRP injections for hair. For optimal results, Dr. Green typically recommends 4 initial treatment sessions spaced approximately 4 to 6 weeks apart. Initial treatment is followed by a touch-up every 3 months during the first year, after which a single maintenance session per year is often sufficient to maintain results.

There is no significant downtime after PRP injections for hair restoration. Because the treatment is non-surgical and uses the patient’s own blood, most patients return to normal daily activities immediately after the appointment.

How long before you see hair regrowth after PRP injections?

Most patients notice initial improvements within a few weeks of their first PRP injections; the full results of treatment typically become visible three to six months after the injections, once the hair follicles have had time to strengthen and enter a new growth phase.

How long do results from PRP injections last?

The results of PRP therapy vary from patient to patient, often depending on the severity of the underlying hair loss and the platelet concentration in the patient’s plasma. Treatment effects can last up to 18 months. Dr. Green recommends periodic touch-up sessions to help maintain hair density and thickness over the long term.

Frequently Asked Questions About PRP Injections for Hair Regrowth

PRP injections for hair regrowth — do they work?

Yes. PRP injections for hair regrowth are a well-established, evidence-based treatment for patients with androgenetic alopecia and other forms of hair thinning. By delivering a concentrated dose of growth factors directly to the scalp, PRP for hair loss helps repair damaged hair follicles, extend the hair growth phase, and promote new hair growth. While results vary from patient to patient, most people who work with an experienced, board-certified dermatologist like Dr. Green see noticeable improvements in hair density and thickness over the course of treatment.

What’s in a PRP injection that stimulates hair regrowth?

PRP injections are rich in growth factors and cytokines — proteins that signal the body to repair tissue, generate new cells, and improve blood flow. When concentrated through centrifugation and injected into the scalp, these growth factors trigger hair follicles to enter an active growth phase, supporting tissue repair and improving scalp health. This regenerative medicine approach essentially uses the body’s own healing signals to reverse some of the follicular damage associated with hair loss.

Where are PRP injections given on the scalp?

PRP injections are administered directly into the areas of the scalp affected by thinning hair or hair loss, typically the crown, temples, and hairline, depending on the pattern of androgenetic alopecia or alopecia areata a patient is experiencing. Dr. Green maps out the treatment area during the consultation so the injections target the follicles most likely to benefit, supporting scalp health and promoting natural-looking hair regrowth throughout the affected area.

How effective are PRP injections for hair regrowth?

Clinical studies have shown that PRP injections significantly increase hair count, hair thickness, and hair density compared with untreated controls in patients with androgenetic alopecia. In studies comparing PRP to other hair loss treatments, roughly 84% of patients reported a positive change after PRP therapy, and about half reported a significant decrease in hair thinning and hair shedding. While individual results vary, the body of research supports PRP as an effective option for hair regrowth when performed by an experienced provider such as Dr. Green.

Do PRP injections work for receding hairlines?

PRP injections can help slow and, in many cases, partially reverse a receding hairline caused by androgenic alopecia, provided the hair follicles in that area are still present, even if dormant. By strengthening existing follicles and extending the hair growth phase, PRP therapy can improve density along the hairline and temples. Dr. Green will evaluate the extent of the recession during your consultation to determine whether PRP alone or a combination approach is best suited to your goals.

Can PRP injections regrow hair on a bald spot?

PRP injections can encourage regrowth in areas with dormant hair follicles, but they cannot generate new hair where the follicle has been completely lost. For patients with a completely bald area, hair transplant surgery may be a more appropriate solution, and PRP therapy is often used afterward to support healing and strengthen the newly transplanted hair follicles.

Do PRP injections work better with microneedling or minoxidil?

Combining PRP therapy with microneedling or minoxidil often produces better results than any single treatment alone. Microneedling creates tiny channels in the scalp that improve the absorption of PRP’s growth factors, while topical minoxidil (Rogaine) and oral finasteride (Propecia) work through complementary pathways to slow hair shedding and support new hair growth.

Can PRP injections be combined with a hair transplant?

Yes, PRP is frequently combined with hair transplant surgery to improve overall outcomes. PRP injections can be used both before and after a hair transplant to support healing, improve blood flow to the transplanted follicles, and encourage faster, healthier new hair growth in the treated area.

Are PRP injections for hair regrowth safe?

PRP injections are considered a very safe, low-risk treatment for hair regrowth. Because the plasma is drawn from the patient’s own blood, the risk of an allergic reaction is minimal, and there is no risk of disease transmission. When performed by an experienced board-certified dermatologist such as Dr. Green, PRP therapy carries a low risk of complications.

What are the side effects of PRP injections in the scalp?

PRP therapy is not typically associated with any severe side effects, though patients treated by an inexperienced injector may be more likely to experience complications such as:

• Damage to blood vessels in the scalp area.
• Injury to nerves
• Infection at the injection site

Some patients may also experience mild, temporary swelling, tenderness at the injection sites, or a headache following treatment, all of which typically resolve within a day or two.

Who is not a good candidate for PRP injections?

PRP injections may not be appropriate for patients with certain blood disorders, active infections at the treatment site, or completely bald areas with no remaining hair follicles, as PRP cannot stimulate growth where follicles no longer exist. Patients on certain blood-thinning medications may also need to pause treatment beforehand. Dr. Green will review your full medical history during your consultation to confirm that PRP is the right treatment for your hair loss.

How much do PRP injections for hair regrowth cost?

The cost of PRP injections depends on several factors, including the size of the treatment area, the number of sessions required, and whether PRP is combined with other treatments such as microneedling or minoxidil. Choosing an experienced board-certified dermatologist helps reduce the risk of complications. Dr. Green’s office can provide a personalized cost estimate after your initial consultation and treatment plan are completed.

Schedule Your PRP Hair Regrowth Consultation with Dr. Green Today

Hair loss and thinning hair can affect anyone, but with the right treatment plan, hair regrowth is often within reach. PRP therapy offers a safe, non-surgical way to heal damaged hair follicles, extend the hair cycle, and restore hair density and hair thickness, whether used alone or combined with microneedling, minoxidil, finasteride, or hair transplant surgery. Because an accurate diagnosis is essential to selecting the right treatment for your specific type of hair loss, the best first step is a consultation with an experienced board-certified dermatologist such as Dr. Michele Green.

Dr. Michele Green is an internationally renowned board-certified dermatologist with over 25 years of experience providing her patients with the most effective non-invasive treatment options, including PRP hair treatment for hair regrowth. She takes a holistic, less-is-more approach, creating customized treatment plans tailored to each patient’s unique hair loss concerns and aesthetic goals. Consistently recognized as one of New York’s best dermatologists by Castle Connolly, New York Magazine, and Super Doctors, Dr. Green invites you to call 212-535-3088 or contact us online to schedule a consultation and find out if PRP injections are right for you.