Microneedling has been exploding in popularity. It's claimed to reduce scars, wrinkles, and more.
But it sounds a bit counterintuitive: improving skin and treating the signs of aging by sticking a large number of tiny needles into it.
So is there actually anything to this? This article walks through the clinical evidence — and covers some crucial information anyone considering an at-home device needs to know before spending money.
Table of Contents
- How Microneedling Works
- What the Clinical Evidence Shows
- What About At-Home Devices?
- The Bottom Line
- References
How Microneedling Works
Back in the mid 90s, a plastic surgeon in Canada had a novel idea to improve the appearance of scars. He used a tattoo gun to inject ink into the skin of his patients to try to hide the discoloration [1].
This led to a surprising discovery. Though his aim had been to hide the scar, he began to notice his patients' scars were improving in texture and appearance — and it didn't seem to be because of the ink. Instead, the tattoo needles themselves were causing the improvements.
He published an influential article in 1997 describing a method of treating scars by using a tattoo gun — without the ink [2].
Since then, various forms of what came to be called microneedling have developed. An early product was the Dermaroller, which consisted of a head embedded with tiny needles, which is rolled over the skin [3]. Later developments have included stamps and pens. But they all rely upon the same basic approach of piercing the skin with a large number of tiny needles.
So why is that supposed to help?
At first, the idea sounds counterintuitive. The aim is to bring healing by causing damage. But the key is that it's carefully controlled damage. The microinjuries caused by the needles stimulate a powerful healing response. The body releases growth factors that generate new collagen and elastin, the crucial building blocks that give skin structure and flexibility [4].
Moreover, when it comes to scars, the needles can break down strands of scar tissue and stimulate the growth of new blood vessels and collagen [4].
The technique is also increasingly being used to enhance the delivery of medications across the skin barrier [4]. Some microneedling treatments combine the action of the needles themselves with medications delivered at the same time.
What the Clinical Evidence Shows
The theory sounds plausible. It's essentially the same mechanism some forms of laser therapy use — causing micro damage to stimulate the body's healing response. But what kind of impacts do clinical trials actually show?
An early study seemed to confirm the basic mechanism. Researchers assessed 480 patients who had been treated through microneedling for fine wrinkles, lax skin, scarring, and stretch marks. On average, the patients reported a 60 to 80% improvement [5].
But more interesting was what researchers found when they examined skin samples from 20 patients. There was a significant increase in the production of collagen and elastin. And the outer layer of the skin was 40% thicker 1 year after the procedure [5].
This was followed by numerous trials that have tested microneedling on a variety of skin conditions. Here is a closer look at the research.
Acne Scarring
Acne scarring is a particularly challenging area, because the scars can be deep and difficult to improve through existing approaches. The needle-driven mechanism is thought to be especially well-suited here: by breaking down existing scar tissue and stimulating the formation of new collagen in a more organised pattern, the skin's surface texture can gradually improve over multiple sessions.
A 2021 review included 9 randomized controlled trials of microneedling as a treatment for this problem [6].
Assessing effectiveness in this area is a little tricky. It typically depends upon judgment of improvements based on a scale, instead of objective measures. But all the included studies used standard grading systems, with evaluations from both participants and researchers.
The included studies used different variations of treatment, but the findings were consistent across studies. Microneedling was effective in treating acne scars. And there were no serious adverse effects reported in the included studies [6].
A more recent meta-analysis found a standard mean difference of about 0.42 with microneedling in the included studies. This indicates a real but modest improvement [7].
Signs of Photo Aging
Turning to the signs of photo aging — things like fine lines and wrinkles — a 2018 study assessed how 4 microneedling sessions spaced 30 days apart were able to rejuvenate skin. It included 48 participants [8]. A particular strength of this study was its use of both subjective and objective measurement tools, allowing researchers to cross-check expert ratings against device-measured skin parameters.
Researchers measured wrinkles, skin laxity, and skin texture. They used both a grading scale that relies on expert judgment and a precision optical device that measures skin parameters [8].
At 150 days after the initial treatment, researchers compared patients' skin condition to its state before the study began. Using the grading scales, they saw significant improvements in wrinkles, skin laxity, and texture [8].
To put these numbers in context: the scale used for wrinkles ranges from 0 to 5, with 0 indicating no wrinkles and 5 indicating very deep ones [9]. At baseline, the average score was 3.17 — moderately deep wrinkles. By day 150, it was 2.24, moving well into the "shallow wrinkles" category — an improvement of more than a whole category on the scale [8].
The change in other measures was similarly significant. Objective measurements backed up these scale-based observations: smile line measurements improved by as much as 57% in a metric that captures the average of the 5 highest peaks and deepest valleys in the skin. That is a clinically meaningful impact [8].
Skin Pigment Issues
Another area where microneedling has shown positive results is with skin pigment issues, like vitiligo. This is when patients develop patches of skin where pigment is missing. Researchers have found that joining microneedling with other therapies can often produce even stronger results.
For example, one study split 46 patients with vitiligo into 2 groups. One was treated with microneedling alone. The other received microneedling treatments along with 5-fluorouracil. At the end of the trial, both groups had areas of vitiligo where more than 75% of pigmentation was restored. But the combined therapy group had more than twice as many patches with this strong of a response [10].
The Bigger Picture
Overall, an extensive review of the research concluded that microneedling demonstrates substantial promise across a range of skin problems beyond just improving the signs of aging [11].
But there are some important cautions. There is a wide variety of different microneedling devices and treatment approaches. Individual trials also use different kinds of metrics to assess outcomes. This makes pulling together results in meta-analyses challenging. And many of the studies are small. So it is difficult to get a clear picture of the magnitude of benefit or the most effective treatment approaches. Existing studies show a pattern of consistent benefit, but the optimal protocols remain less well defined.
It is also worth seeing how microneedling compares to one of the best-established treatments for countering the signs of aging. One study put CO2 laser treatments up against microneedling (with both treatments combined with an additional topical treatment). The CO2 laser was significantly more effective. And patients were more satisfied with the results — 84.6% reported complete satisfaction with the laser group compared to 50% in the microneedling group [12].
What About At-Home Devices?
This brings up an important practical question. Microneedling products are widely advertised online with promises of a range of skin benefits. Are they worth trying?
An important factor for the effectiveness of microneedling devices is the needle length. For treating aging skin, needle lengths of 0.5 to 1.0 mm are recommended. For scars, up to 2.0 mm might be used [4].
Products marketed for at-home use are often quite a bit shorter. These shorter needles may not reach the deeper layers of the skin needed to stimulate the healing process described earlier. The problem is that devices that reach deeper and are intended to treat scars and wrinkles are considered medical devices in the U.S. The FDA has not cleared any of these devices for over-the-counter sale — at least as of October 15, 2025 [13].
The FDA recommends going to a trained professional to receive treatment with these medical devices [13].
So when microneedling products appear for sale online (at least in the U.S.), one of 2 things is likely happening. Either the device does not penetrate the skin very deeply and is unlikely to produce much of an effect — or it is a device the FDA would consider a medical device but that has not been tested or evaluated. In the latter case, effectiveness and safety are unknowns. Deeper penetration also exposes users to greater risks of infection.
Looking at some best sellers on Amazon illustrates this point clearly.
The top seller is the Roselyn Boutique Derma Roller, with needles of just 0.25mm — not long enough to penetrate to the levels that can stimulate collagen production. Notably, the product page makes essentially zero claims about what it does. It is simply described as a "cosmetic beauty instrument."
A bit further down the list (and at a much higher price), the Dr. Pen device presents a more medical-grade appearance. But its needle length is just shy of 0.3 mm. The product clearly states it is non-invasive, and the claims are about exfoliating skin — not improving wrinkles. This also falls into the non-medical device category.
The Bottom Line
The theory behind microneedling seems sound, and there are some promising clinical results across several skin conditions. Studies have generally found adverse effects to be minimal, suggesting a good safety profile when performed by trained professionals.
At-home kits are potentially a cheaper option, but there are risks of infection and the needles on consumer devices are typically not long enough to produce a meaningful effect.
The evidence base would benefit from larger and more rigorous trials to better characterise the size of benefit and how microneedling compares to alternatives — such as fractional, non-ablative laser treatments. For now, professional microneedling performed in a clinical setting shows the most consistent evidence for skin improvements, while at-home devices remain a poorly regulated category with uncertain real-world effectiveness. Anyone interested in the treatment should consult a qualified dermatologist or cosmetic physician who can recommend the appropriate device depth and number of sessions for their specific skin concern.
References
2. https://link.springer.com/article/10.1007/s002669900081
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC2918341/
4. https://www.ncbi.nlm.nih.gov/sites/books/NBK459344/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC8450803/
7. https://link.springer.com/article/10.1007/s00266-022-02845-3
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC6122507/
9. https://academic.oup.com/asj/article/42/10/1154/6565988
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC8751692/
