Microneedling for Hair Growth: Does It Work, How Often, and What Depth

If you are dealing with male pattern baldness or hair thinning, you have probably come across microneedling for hair growth. It is one of the most discussed treatment options for men (and women) looking to support regrowth, whether on its own or alongside hair loss treatments like minoxidil and finasteride.

This guide explains what scalp microneedling is, how it may support hair growth, what the research says about results, what depth and frequency are commonly used, and what to know before doing it at home.

What Is Microneedling for Hair Growth?

Microneedling for hair growth is a minimally invasive procedure that uses fine needles to create hundreds of controlled microscopic injuries across the scalp. Also called collagen induction therapy, microneedle roller treatment, or scalp microneedling, it is usually done with a dermaroller, dermastamp, or pen device and is mainly used for hair loss conditions like male pattern baldness and other forms of hair thinning.

The science behind scalp microneedling for hair growth is simple: injure the scalp in a controlled way, and the body starts a wound-healing response. That natural response is believed to stimulate the conditions needed for hair regrowth.

What Actually Happens When You Microneedle Your Scalp?

• Inflammation triggers growth factors. The word 'inflammation' gets a bad rap, but it is the body's natural response to injuries and infections that keeps us protected and helps us heal. When microneedles puncture the scalp, your immune system releases growth factors to the injury site. These growth factors send signals to your hair follicles, telling them to stop resting and start producing hair more actively again.
• Blood supply to the follicles increases. The micro-injuries trigger an increase in blood circulation in the scalp. Better blood flow means more oxygen and nutrients reaching the follicle, which is incredibly important because follicles in people experiencing hair loss, particularly androgenetic alopecia, are often working with a compromised blood supply due to miniaturization, a process where follicles progressively shrink and produce thinner, weaker hair over time before eventually stopping altogether.
• Collagen production increases around the follicle. Microneedling stimulates collagen production in the dermis, the layer of skin just beneath the surface where your hair follicles live. Every follicle relies on collagen to stay rooted in the scalp and produce hair consistently. When collagen breaks down, follicles become less stable and more prone to shedding earlier than they should, and more collagen helps reverse that.
• Topical treatments absorb more effectively. When the needles puncture the scalp, they create tiny openings in the skin that temporarily increase how much your scalp can absorb. This allows topical hair loss treatments like minoxidil or platelet-rich plasma (PRP) to penetrate deeper and more effectively than they would on intact skin. Some studies suggest that combining microneedling with topical minoxidil produces better outcomes than minoxidil alone for this reason.

Does Microneedling Really Work for Hair Growth?

Yes, microneedling can help with hair growth, especially as an add-on rather than a miracle treatment on its own.

A 2021 systematic review looked at 22 clinical studies involving 1,127 people with different types of hair loss and found generally favorable results for microneedling, particularly when it was combined with treatments like minoxidil, platelet-rich plasma, or growth factor solutions. In men and women with androgenetic alopecia, the review found improvements in things like hair count, hair diameter, and photographic assessments of regrowth. It also reported no serious adverse events among the people who actually received microneedling.

Another takeaway from the review was that microneedling seems to work best as an add-on to minoxidil. In that review, six out of seven studies comparing microneedling plus 5% minoxidil against minoxidil alone found better increases in hair count with the combined approach.

The review also notes a few reasons this might happen:

• Microneedling may trigger wound-healing signals that help push follicles back into a more active growth phase.
• It may increase blood vessel formation around the follicle, which improves the delivery of oxygen and nutrients.
• It creates tiny channels in the scalp that can help topical minoxidil penetrate more effectively.

There is also some evidence that microneedling may increase sulfotransferase activity. Sulfotransferase is the enzyme that helps convert minoxidil into its active form inside the follicle, so higher activity may help some people respond better to treatment.

A newer 2025 systematic review reached a similar conclusion. It looked at 12 randomized controlled trials involving 631 patients with male and female pattern hair loss and found that microneedling combined with minoxidil improved hair count more than minoxidil alone. It also found an improvement in hair diameter, meaning the individual strands became thicker, which can make thinning look less obvious.

Microneedling vs Dermarolling for Hair Growth

You may be wondering, is microneedling more effective than dermarolling, or is microneedling for hair loss the same as dermarolling?

Dermarolling is a type of microneedling, not a separate treatment. This means that you can perform scalp microneedling for hair growth at home using a dermaroller.

A dermaroller is a handheld tool with a roller covered in microneedles. You use it by rolling across your scalp in multiple directions, horizontally, vertically, and diagonally. They are inexpensive, beginner-friendly and widely available.

Should you use a dermaroller or other at-home microneedling devices like a dermastamp or microneedling pen? While they all stimulate your hair follicles, dermastamps and pens are considered more precise at creating consistent depth with less risk of damage since they use a straight up and down motion. Dermarollers, on the other hand, can drag along your scalp and cause uneven injury if not used carefully.

What Depth Should You Use for Scalp Microneedling?

What size needle is best for hair regrowth? There is no single universally agreed depth for scalp microneedling, but current evidence suggests that around 0.5 mm to 1 mm is often the most effective and safest range for hair regrowth in people with male pattern hair loss.

One 2020 study comparing 0.6 mm and 1.2 mm depths observed 60 patients with moderate to severe androgenetic alopecia in three different groups for 12 weeks:

• Group 1: treatment with minoxidil 5% lotion only
• Group 2: treatment with minoxidil 5% lotion and biweekly microneedling with a depth of 1.2 mm
• Group 3: treatment with minoxidil 5% lotion and biweekly microneedling with a depth of 0.6 mm

The researchers found that the 0.6 mm depth produced greater improvements in hair count and thickness, suggesting that deeper penetration does not automatically mean better results.

Another smaller 2016 study performed on 6 male and 5 female patients with pattern hair loss who combined microneedling every 2 weeks with a topical growth factor cocktail for 3 months found that 0.5 mm outperformed 0.3 mm in increasing hair density.

The takeaway from both studies is simple: going too shallow may not stimulate your scalp enough, but going deeper is not automatically more effective.

How Often Should I Microneedle My Scalp for Hair Growth?

Most men microneedle their scalp 1-2 times a week. As long as your scalp is not irritated, and you are not causing yourself pain or scarring your scalp tissue, that frequency is generally considered safe and effective for hair growth.

That said, when you are microneedling for hair growth, how often you should do it depends on the needle depth you are using. Shallower depths (under 1 mm) cause less trauma to the scalp and your skin may recover quickly, so once or twice a week is recommended. Deeper depths (over 1mm) create deeper micro-injuries and need more recovery time between sessions, around once a week or once every 2-4 weeks, and if your scalp still feels sore by your next microneedling session, wait until it has fully healed before continuing.

How to Do Microneedling for Hair Loss at Home

Scalp microneedling for hair loss at home is not complicated, but it does need to be done carefully especially since it involves creating tiny punctures in the scalp.

• Prepare Your Device: Before you start, soak your dermaroller, dermastamp or microneedling pen in 70% isopropyl alcohol for 5 to 10 minutes and let it dry completely.
• Prepare Your Scalp: Wash your scalp with a gentle shampoo to remove any oil, dirt or product buildup. Make sure your hair is completely dry before you begin, since wet hair can tangle more easily in a dermaroller device.
• Microneedle Your Scalp: Roll or stamp your microneedle device over the target area moving horizontally, vertically and diagonally, going over each area 3 to 4 times. Apply light, even pressure; enough to feel a slight prickling sensation but not enough to cause significant pain or draw blood.
• After Your Session: Wait at least 24 hours before applying any topical treatment including minoxidil or hair growth oils. Applying anything to an open scalp immediately after microneedling can cause irritation and burning.

Can Microneedling Damage Hair Follicles?

Yes, microneedling can damage hair follicles if it is not done correctly. Using too much pressure, moving too aggressively across the scalp, using the wrong needle depth, or microneedling too frequently can cause permanent scarring alopecia, a type of hair loss where inflammation destroys hair follicles and replaces them with scar tissue.

Needles longer than 1.5mm are more likely to damage the hair bulb, the part of the follicle responsible for producing hair, depending on how you use them. Using an unclean dermaroller, dermastamp or pen can also introduce bacteria to open skin and cause folliculitis, a scalp infection that, if left untreated, can lead to scarring and possibly permanent follicle damage.

Who Should Avoid Microneedling?

Scalp microneedling is not suitable for everyone. You should avoid it completely or consult your healthcare provider first if you have:

• Active scalp conditions like folliculitis, psoriasis flares, or severe dermatitis.
• Active bacterial, fungal or viral infections affecting your skin or scalp.
• Open or unhealed wounds in the area you plan to treat.
• A history of keloids or hypertrophic scarring, as microneedling can trigger abnormal scar formation.
• Conditions that impair wound healing like uncontrolled diabetes or connective tissue disorders.
• A prescription for anticoagulant medication, as microneedling increases bleeding risk.

What Are the Risks of Scalp Microneedling?

Scalp microneedling is generally considered safe when done properly, but it can still cause temporary side effects. These include redness, mild swelling, sensitivity, itching and flaking as your scalp heals. Most of these settle on their own within a few days.

Your scalp will also be more sensitive to sunlight and topical products in the days following a session, particularly products containing alcohol or acids. That is why it makes sense to wait at least 24 hours before applying topical products. When you do apply a topical treatment the next day, wash your hands thoroughly or use a cotton ball to avoid introducing bacteria to the area.

If you experience intense burning, persistent pain, or swelling that does not settle within a few days, speak to a dermatologist.

How Long Does it Take to See Results from Microneedling Hair?

Most people who microneedle consistently alongside a topical treatment like minoxidil start noticing changes in hair density and thickness somewhere between 3 and 6 months, with more visible improvement often showing up closer to the 6 to 12-month mark. That timeline reflects how the hair growth cycle works.

Hair follicles move through resting and active phases, and microneedling works by gradually pushing weakened or inactive follicles back into a growth phase. That takes time, and results will vary depending on how advanced the hair loss is, whether microneedling is being combined with other treatments, and how consistently it is being done.

Tracking whether microneedling is actually working for you comes down to having a reliable method. Standardized progress photos and AI-powered scalp scan tools like Hairloss AI make it easier to measure real changes in density over time, rather than relying on how your hair looks in the mirror on any given day.

References

• English, R. S., Ruiz, S., & DoAmaral, P. (2021). Microneedling and its Use in hair Loss Disorders: a systematic review. Dermatology and Therapy, 12(1), 41–60. https://doi.org/10.1007/s13555-021-00653-2
• Ahmed, K. M. A., Kozaa, Y. A., Abuawwad, M. T., Al-Najdawi, A. I., Mahmoud, Y. W., Ahmed, A. M., Taha, M. J. J., Fadhli, T., & Giannopoulou, A. (2025). Evaluating the efficacy and safety of combined microneedling therapy versus topical Minoxidil in androgenetic alopecia: a systematic review and meta-analysis. Archives of Dermatological Research, 317(1), 528. https://doi.org/10.1007/s00403-025-04032-1
• Faghihi, G., Nabavinejad, S., Mokhtari, F., Naeini, F. F., & Iraji, F. (2020). Microneedling in androgenetic alopecia; comparing two different depths of microneedles. Journal of Cosmetic Dermatology, 20(4), 1241–1247. https://doi.org/10.1111/jocd.13714
• Ro, B. I., Son, H. O., Chun, S. W., & Shin, H. C. (2016, May 2). Therapeutic Effects of Growth Factor Cocktail Treatment in Patients with Androgenetic Alopecia According to the Depth of Microneedle. KoreaMed. https://www.koreamed.org/SearchBasic.php?RID=2162219