Microneedling and Dermarolling for Hair Growth

Microneedling may improve hair-growth outcomes in people with androgenetic alopecia, particularly when it is used alongside topical minoxidil. However, microneedling is not an established treatment for every type of hair loss, and evidence for using it alone remains limited.

Clinical studies have used different devices, needle depths, treatment intervals and endpoints. Therefore, no single microneedling protocol has been established as best for hair growth.

At-home dermarolling introduces additional concerns, including inconsistent needle penetration, poor sanitation, excessive treatment and unsafe application of topical products through a temporarily disrupted skin barrier.

This Journal review examines the clinical evidence, proposed mechanisms, protocol uncertainty and safety considerations surrounding microneedling and dermarolling for hair growth.

What Is Microneedling?

Microneedling uses multiple fine needles to create controlled punctures in the skin. In dermatology, the technique has been studied and used for purposes including scar treatment and skin remodeling.

Hair-restoration studies have adapted the technique for the scalp, particularly in people with male or female androgenetic alopecia.

Devices include:

• Manual dermarollers.
• Automated microneedling pens.
• Motorized stamping devices.
• Professional systems with adjustable treatment settings.

These devices are not interchangeable. Their needle geometry, movement, penetration consistency and intended use can differ substantially.

Microneedling should also be distinguished from radiofrequency microneedling. Radiofrequency devices deliver thermal energy beneath the skin and have a different risk profile. Evidence about ordinary mechanical scalp microneedling cannot automatically be applied to radiofrequency treatment.

Is Microneedling FDA Cleared for Hair Loss?

No microneedling device is currently cleared by the U.S. Food and Drug Administration specifically for treating hair loss.

The FDA also states that it has not cleared microneedling devices for use with another product, including drugs, cosmetics or platelet-rich plasma. Therefore, the agency has not evaluated the safety or effectiveness of using these devices to deliver minoxidil or another topical treatment through the skin.

This does not mean every off-label clinical use is ineffective. It means patients should not confuse emerging research or professional off-label treatment with FDA device clearance for hair growth.

How Might Microneedling Affect Hair Growth?

Several biological mechanisms have been proposed. Most come from animal studies, laboratory research, wound-healing biology and indirect human evidence.

These mechanisms help explain why microneedling is being studied. They do not prove that every proposed pathway produces clinically meaningful regrowth in patients.

Wound-healing signalling

Controlled skin injury initiates a repair response involving inflammatory mediators, growth factors, extracellular-matrix changes and tissue remodeling.

In a mouse study, repeated microneedle stimulation was associated with earlier hair growth and changes in hair-related signalling. The investigators reported increased expression of factors including vascular endothelial growth factor and activation of Wnt/β-catenin-related pathways.

However, results from a murine model cannot establish the optimal procedure or expected response in humans.

Wnt and β-catenin signalling

Wnt/β-catenin signalling participates in hair-follicle development and cycling. Preclinical research suggests that controlled injury can influence this pathway.

It remains uncertain how much of the clinical response to scalp microneedling is produced by Wnt signalling, altered topical delivery, the broader wound-healing response or a combination of effects.

Growth-factor release

Wound healing can involve mediators such as vascular endothelial growth factor and fibroblast growth factors. These factors participate in tissue repair, vascular biology and cellular communication.

The original article interpreted this as proven improvement in oxygen and nutrient delivery to follicles. That conclusion goes beyond the evidence. Increased expression of a growth factor does not automatically demonstrate that follicular nutrition or oxygen delivery has become a limiting clinical variable.

Follicular stem cells

Epithelial stem cells in the follicular bulge help regenerate the follicle during normal cycling.

Mechanical and wound-related signals may influence stem-cell activity in experimental systems. Nevertheless, current clinical evidence does not demonstrate that scalp microneedling reliably “reactivates dormant stem cells” in people with hair loss.

Mechanical signalling

Cells can respond to physical forces through mechanotransduction. Researchers are investigating whether controlled mechanical stimulation affects dermal-papilla cells, extracellular matrix and hair-cycle signalling.

This remains an emerging area. It should not yet be used to promise anagen activation or predictable reversal of miniaturization.

Changes in topical penetration

Microneedling creates temporary channels that can alter the skin barrier and increase penetration of substances applied to the treated area.

This may partly explain why combination studies involving topical minoxidil have produced better outcomes. However, increased penetration can also increase irritation or systemic exposure.

More absorption is not automatically safer or more effective. The formulation, timing, needle depth, skin condition and treatment protocol all matter.

What Does the Clinical Evidence Show?

The strongest clinical evidence concerns microneedling as an adjunct to topical minoxidil for androgenetic alopecia.

The 2013 pilot study

A frequently cited evaluator-blinded randomized pilot study compared weekly microneedling plus 5% topical minoxidil with 5% minoxidil alone in men with androgenetic alopecia.

After 12 weeks, the combination group showed a greater increase in hair count and more favorable investigator assessment.

The often-quoted figures stating that 82% of the combination group achieved greater than 50% improvement, compared with 4.5% in the minoxidil-only group, came from a subjective patient-assessment category. They should not be interpreted as objective proof that 82% of patients regrew more than half of their lost hair.

The study was influential, but it had limitations:

• It was a pilot study.
• Treatment lasted only 12 weeks.
• Participants and treatment providers could not be blinded to needling.
• The protocol used weekly 1.5 mm dermarolling until mild erythema.
• The findings do not establish that the same protocol is safest or best for routine practice.

Later randomized studies

Other randomized studies have also reported better outcomes when microneedling was combined with minoxidil than when minoxidil was used alone.

A 2018 single-observer-blinded study in men found greater improvement in the combination group. However, the study was relatively small and followed participants for a limited period.

A separate randomized study compared 0.6 mm and 1.2 mm microneedling depths alongside minoxidil. Both were studied as adjuncts, but the 0.6 mm depth tended to produce better results than 1.2 mm.

This finding directly challenges the assumption that deeper treatment must produce better hair growth.

Systematic reviews and meta-analyses

A 2024 systematic review and meta-analysis of randomized trials found that combined microneedling treatment improved hair-related outcomes compared with monotherapy.

Another 2024 analysis of eight randomized trials involving 472 participants reported that microneedling plus 5% minoxidil increased hair count compared with minoxidil alone. However, it did not find a significant improvement in hair diameter in the principal pooled comparison.

These findings are encouraging, but important limitations remain:

• Trials used different devices and depths.
• Treatment frequency varied.
• Minoxidil regimens were not uniform.
• Study populations differed.
• Outcome measurements varied.
• Many studies were small and relatively short.
• Blinding a physical procedure is difficult.
• Long-term maintenance and relapse data remain limited.

Therefore, the evidence supports microneedling as a potentially useful adjunct for selected patients with androgenetic alopecia. It does not establish one universally effective protocol.

Microneedling Alone Versus Combination Treatment

Should Minoxidil Be Applied Immediately After Microneedling?

Do not assume that minoxidil should be applied immediately after needling.

A disrupted skin barrier may increase minoxidil absorption, burning and irritation. Greater systemic absorption could theoretically increase the likelihood of effects such as dizziness, rapid heartbeat, fluid retention or changes in blood pressure.

In the original 2013 pilot study, participants were instructed not to apply minoxidil on the day of microneedling and to restart it 24 hours later.

Other research protocols differ. This is another reason patients should not combine a dermaroller and topical medication based only on social-media instructions.

The timing of minoxidil or another active product should follow a clinician-directed protocol and the product’s medical guidance.

What About Topical Finasteride, Peptides or Botanical Serums?

The supplied article suggested that microneedling may enhance the delivery of topical finasteride, botanical actives and peptide formulations.

Creating microchannels could alter the penetration of many products. However, that does not establish safety, dosing or effectiveness.

Products formulated for application to intact skin may not be suitable for freshly needled skin. Ingredients such as alcohol, fragrances, preservatives, essential oils and concentrated actives may cause significant irritation when the barrier is disrupted.

Topical finasteride also has potential systemic and reproductive-safety considerations. It should not be introduced through a microneedling protocol without appropriate medical supervision.

The FDA has not cleared microneedling devices for delivering these products.

Dermaroller Versus Professional Microneedling

Professional treatment may offer better control, but it is not automatically risk-free. Training, scope of practice, device quality, sanitation and patient-specific assessment still matter.

What Is the Best Needle Depth for Hair Growth?

No universally accepted needle depth has been established for hair growth.

Clinical studies have used depths ranging from relatively superficial needling to approximately 1.5 mm or more. However, a device’s stated needle length does not always equal its true penetration into the scalp.

Actual penetration can be affected by:

• Device design.
• Manual pressure.
• Needle sharpness.
• Scalp thickness.
• Hair density.
• Treatment angle.
• Number of passes.
• Automated device speed.

The original article assigned fixed biological purposes to 0.25 mm, 0.5 mm and 1–1.5 mm depths. Current evidence is not strong enough to support those categories as universal clinical rules.

In addition, the randomized comparison of 0.6 mm and 1.2 mm treatment found that the shallower setting tended to perform better. Deeper treatment should therefore not be assumed to produce a stronger benefit.

How Often Should Scalp Microneedling Be Performed?

No evidence-based schedule is appropriate for every device, depth and patient.

Published trials have used weekly, biweekly and less frequent protocols. Treatment intervals should account for:

• Needle depth and device.
• The degree of erythema or pinpoint bleeding.
• Scalp sensitivity.
• Recovery time.
• Concurrent topical treatment.
• Active scalp disease.
• Previous adverse reactions.

Persistent redness, pain, crusting or tenderness indicates that the scalp has not recovered normally. Repeating treatment over an irritated scalp can worsen barrier damage rather than improve results.

Does Microneedling Reverse Perifollicular Fibrosis?

Perifollicular inflammation and fibrosis have been identified in some histological studies of androgenetic alopecia, particularly in more advanced or inflammatory presentations.

Microneedling can influence collagen remodeling in other dermatological contexts, such as certain scars. Nevertheless, there is not enough direct clinical evidence to conclude that scalp microneedling reverses AGA-associated perifollicular fibrosis or restores follicles by “breaking up micro-scarring.”

A 2026 histopathological study concerning perifollicular inflammation and fibrosis in androgenetic alopecia did not establish microneedling as a treatment for that finding.

This mechanism should remain a research question rather than a clinical promise.

Potential Benefits

For an appropriately selected patient with confirmed androgenetic alopecia, potential benefits may include:

• Improved hair-count outcomes when combined with topical minoxidil.
• Possible benefit in some patients who responded poorly to minoxidil alone.
• A non-systemic procedural adjunct to an established treatment plan.
• Potential modification of local wound-healing and hair-cycle signalling.

Response remains variable. Microneedling should not be described as guaranteed regrowth or a permanent reversal of pattern hair loss.

Risks and Adverse Effects

Common short-term reactions may include:

• Redness.
• Tenderness or discomfort.
• Burning or stinging.
• Temporary swelling.
• Pinpoint bleeding.
• Dryness, flaking or crusting.
• Temporary irritation when topical products are restarted.

Less common but more important complications may include:

• Bacterial infection or folliculitis.
• Viral reactivation in susceptible patients.
• Prolonged inflammation.
• Post-inflammatory hyperpigmentation or hypopigmentation.
• Contact dermatitis from products applied to the disrupted barrier.
• Scarring after excessive or inappropriate treatment.
• Worsening of an active scalp disorder.
• Unexpected systemic exposure to a topical medication.

Serious complications appear uncommon in published hair-loss trials, but trial conditions may not reflect unsupervised home use.

Common Microneedling Mistakes

Treating without a diagnosis

A dermaroller cannot determine whether hair loss is androgenetic, autoimmune, infectious, nutritional, mechanical or scarring. Treating the wrong condition can delay appropriate care.

Assuming more injury means more growth

Deeper penetration, heavier pressure and more frequent sessions do not necessarily improve outcomes. They may simply increase tissue damage.

Reusing contaminated devices

Needles can carry blood, skin debris and microorganisms. A device that looks clean is not necessarily sterile.

Professional devices should use appropriate sterile, single-use needle components. Home users should not share devices, and visibly damaged, bent, blunt or contaminated needles should never be used.

Needling over an inflamed scalp

Microneedling over dermatitis, folliculitis, infection, open wounds, painful inflammation or an undiagnosed scarring process can worsen the condition.

Applying unsuitable products afterward

Products designed for intact skin may sting or penetrate unpredictably after needling. Essential oils, fragranced products and concentrated actives are not automatically safe because they are marketed as natural.

Ignoring poor healing

Increasing pain, spreading redness, pus, fever, marked swelling or persistent crusting requires medical attention.

Who May Be an Appropriate Candidate?

The best-supported candidate is an adult with confirmed androgenetic alopecia who is considering microneedling as an adjunct to an evidence-based treatment plan.

Potentially suitable candidates may include people with:

• Early or moderate male pattern hair loss.
• Female pattern hair loss after appropriate evaluation.
• Miniaturizing follicles that remain clinically viable.
• An inadequate response to topical minoxidil alone.
• A healthy scalp without active infection or marked inflammation.

Even in these groups, suitability depends on medical history, medications, scalp condition, treatment goals and tolerance.

Who Should Avoid Microneedling or Seek Medical Clearance?

Microneedling may be inappropriate or require medical clearance in people with:

• Active bacterial, fungal or viral scalp infection.
• Folliculitis or open wounds.
• Active psoriasis, eczema or severe seborrheic dermatitis in the treatment area.
• Suspected scarring alopecia.
• A tendency toward keloid or abnormal scar formation.
• Bleeding disorders.
• Anticoagulant or antiplatelet treatment.
• Poor wound healing.
• Uncontrolled diabetes.
• Significant immune suppression.
• Known allergy to products used during or after treatment.
• Recent scalp surgery or another procedure that has not healed.

Pregnancy or breastfeeding also changes the safety assessment of accompanying medications. Topical minoxidil and anti-androgenic products should not be added casually during these periods.

Does Microneedling Work for Other Types of Hair Loss?

Telogen effluvium

Microneedling is not an established primary treatment for telogen effluvium. Management should focus on identifying and correcting triggers such as illness, nutritional deficiency, medication changes, rapid weight loss or thyroid dysfunction.

Alopecia areata

Alopecia areata is immune mediated. Microneedling is not an established replacement for corticosteroids, topical immunotherapy, JAK inhibitors or other dermatologist-directed treatment.

Needling an active patch may cause irritation without addressing the autoimmune mechanism.

Scarring alopecia

Microneedling should not be used as a general treatment for active scarring alopecia. These disorders require prompt control of inflammation to protect remaining follicles.

Procedural treatment over an active inflammatory process could aggravate symptoms or delay appropriate medical care.

Hair-shaft breakage

Microneedling does not repair damaged hair shafts. Breakage requires evaluation of grooming practices, chemical processing, heat exposure, shaft disorders and hair-care technique.

How Should Response Be Evaluated?

Hair growth changes slowly. Treatment should be assessed with consistent documentation rather than daily mirror checks.

Useful measures may include:

• Standardized photographs with consistent lighting, angle and hairstyle.
• Target-area hair counts where available.
• Trichoscopic assessment of density and miniaturization.
• Evaluation of shedding and scalp tolerance.
• Documentation of concurrent medication use.
• Recording treatment depth, device and interval.

Improvement should not be attributed automatically to microneedling when minoxidil or another treatment began at the same time.

Frequently Asked Questions

Does microneedling regrow hair?

Microneedling may improve hair-count outcomes in some people with androgenetic alopecia, especially when combined with topical minoxidil. It does not reliably regrow hair in every patient or every form of hair loss.

Does microneedling work without minoxidil?

Evidence for microneedling alone is limited. Combination treatment with minoxidil has a stronger clinical evidence base than microneedling monotherapy.

Is microneedling FDA approved for hair growth?

No microneedling device is currently FDA cleared specifically for treating hair loss. The FDA has also not cleared microneedling devices for use with minoxidil or another topical product.

What needle depth is best for hair growth?

No universal best depth has been established. Studies use different devices and protocols, and deeper needling is not necessarily more effective. One randomized study found that 0.6 mm tended to perform better than 1.2 mm when combined with minoxidil.

How often should I microneedle my scalp?

No single schedule is appropriate for every device, depth and patient. Published research uses different intervals. Treatment should not be repeated over a scalp that remains painful, inflamed or incompletely healed.

Can I apply minoxidil immediately after microneedling?

Immediate application may increase irritation and systemic absorption. In the influential 2013 trial, minoxidil was withheld on the needling day and resumed 24 hours later. Follow a clinician-directed protocol rather than assuming immediate application is beneficial.

Is a dermaroller as effective as a microneedling pen?

There is not enough comparative evidence to say that all rollers and pens produce equivalent results. Automated devices may offer more consistent control, while dermarollers depend heavily on pressure, angle and user technique.

Can microneedling make hair loss worse?

Excessive or inappropriate treatment can cause inflammation, infection, irritation or temporary increased shedding. It may also aggravate an active scalp disorder.

Can microneedling treat alopecia areata?

Microneedling is not an established primary treatment for alopecia areata. Alopecia areata is immune mediated and requires a different clinical approach.

Can microneedling treat scarring alopecia?

It should not be used as a general treatment for active scarring alopecia. Prompt dermatologist-directed treatment is needed to control inflammation and protect remaining follicles.

How long does microneedling take to show results?

Clinical studies commonly evaluate outcomes over approximately three to six months. Individual response varies, and longer follow-up is needed to understand durability.

Conclusion

Microneedling is a promising adjunctive procedure for androgenetic alopecia, particularly when combined with topical minoxidil.

Randomized studies and meta-analyses generally report better hair-count outcomes with combination treatment than with minoxidil alone. However, the research uses inconsistent devices, depths, frequencies and outcome measures.

Evidence for microneedling alone is weaker. Experimental findings involving Wnt signalling, growth factors, stem cells, mechanotransduction and collagen remodeling should not be presented as proven clinical regrowth mechanisms.

Safety also matters. No microneedling device is currently FDA cleared specifically for hair loss or for delivering minoxidil through the scalp. Treatment can alter topical absorption and may be inappropriate when infection, inflammation or scarring disease is present.

Microneedling is best considered after the cause of hair loss has been confirmed and as one part of a carefully selected treatment plan, not as a universal home remedy.

References

1. Kim YS, Jeong KH, Kim JE, Woo YJ, Kim BJ, Kang H. Repeated Microneedle Stimulation Induces Enhanced Hair Growth in a Murine Model. Annals of Dermatology. 2016;28(5):586–592. https://doi.org/10.5021/ad.2016.28.5.586
2. Joulai Veijouye S, Yari A, Akbari A, Ebrahimi-Barough S. Bulge Region as a Putative Hair Follicle Stem Cell Niche: A Brief Review. Iranian Journal of Public Health. 2017;46(9):1167–1175. PubMed record
3. Dhurat R, Sukesh M, Avhad G, Dandale A, Pal A, Pund P. A Randomized Evaluator Blinded Study of Effect of Microneedling in Androgenetic Alopecia: A Pilot Study. International Journal of Trichology. 2013;5(1):6–11. https://doi.org/10.4103/0974-7753.114700
4. Kumar MK, Inamadar AC, Palit A. A Randomized Controlled, Single-Observer Blinded Study to Determine the Efficacy of Topical Minoxidil Plus Microneedling Versus Topical Minoxidil Alone in the Treatment of Androgenetic Alopecia. Journal of Cutaneous and Aesthetic Surgery. 2018;11(4):211–216. PubMed record
5. Faghihi G, Nabavinejad S, Mokhtari F, Fatemi Naeini F, Iraji F. Microneedling in Androgenetic Alopecia: Comparing Two Different Depths of Microneedles. Journal of Cosmetic Dermatology. 2021;20(4):1241–1247. PubMed record
6. Pei D, Zeng L, Huang X, Wang B, Liu L, Zhang G. Efficacy and Safety of Combined Microneedling Therapy for Androgenic Alopecia: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Journal of Cosmetic Dermatology. 2024;23(5):1560–1572. https://doi.org/10.1111/jocd.16186
7. Xu C, Duan X, Yin Q, Liu K. Effect of Microneedle on Hair Regrowth in Patients with Androgenetic Alopecia: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Chinese Medicine and Natural Products. 2024;4:e8–e17. https://doi.org/10.1055/s-0044-1782181
8. Jaiswal S, Jawade S. Microneedling in Dermatology: A Comprehensive Review of Applications, Techniques, and Outcomes. Cureus. 2024;16:e70033. https://doi.org/10.7759/cureus.70033
9. Umar S, Tan BH, Shitabata PK. Perifollicular Inflammation and Fibrosis in Androgenetic Alopecia: Implications for Diagnosis and Treatment – A Comparative Histopathologic and Clinical Study with Normal-Appearing Scalp. Clinical, Cosmetic and Investigational Dermatology. 2026;19. https://doi.org/10.2147/CCID.S548520
10. Zhang Q, Shi L, He H, et al. Down-Regulating Scar Formation by Microneedles Directly via a Mechanical Communication Pathway. ACS Nano. 2022;16(7):10163–10178. https://doi.org/10.1021/acsnano.2c01518
11. Nam SY, et al. Hair Regeneration: Mechano-Activation and Related Therapeutic Approaches. Journal of Tissue Engineering. 2025;16. https://doi.org/10.1177/20417314251362398
12. U.S. Food and Drug Administration. Microneedling Devices: Getting to the Point on Benefits, Risks and Safety. Updated October 15, 2025. FDA consumer guidance
13. U.S. Food and Drug Administration. Microneedling Devices. Updated October 15, 2025. FDA device guidance

Medical disclaimer: This Journal article is provided for professional education and general information. It does not replace diagnosis, medical advice or individualized procedural guidance. Microneedling can cause bleeding, infection, pigment changes, scarring and altered absorption of topical medication. Seek assessment from an appropriately qualified healthcare professional before using microneedling for unexplained hair loss, combining it with medication or treating an inflamed or damaged scalp.

About the Author

Dr. Samuel Sarmiento Author

Dr. Samuel Sarmiento is a physician with a rich background in clinical medicine, public health, and research. He completed his surgical internship at the Mayo Clinic, where he gained invaluable experience in one of the world's most renowned healthcare institutions. Recognizing the need to broaden his expertise beyond clinical practice, he pursued dual master’s degrees in Public Health and Business Administration at Johns Hopkins University, followed by a postdoctoral fellowship in clinical outcomes research within the Department of Plastic Surgery. View Full Profile