It moves scars a grade, reliably, in small trials. It does not erase them, and nobody has shown it holds past a few months.
Collagen induction therapy. Resurfaces and remodels the skin to erase acne scarring and restore a smooth, even surface.
The market's own words. No brand is named, because the claim is the thing under examination and it belongs to dozens of them.
In adults with atrophic acne scarring, does a course of microneedling, compared with another resurfacing treatment or with no treatment, improve scar severity on a published grading scale?
The same claim written as a proposition somebody could go and check: who, compared with what, measured how, over how long.
Shen, Chiu, Kang and Chen, in Aesthetic Plastic Surgery in 2022, pooled twelve randomised controlled trials and 414 people. Microneedling without radiofrequency came out ahead on scar improvement, with a mean difference of 0.42 on the severity scales used, and no form of microneedling produced post-inflammatory hyperpigmentation — which matters more than it sounds, because hyperpigmentation is the standard risk of resurfacing in richly pigmented skin and it is the reason a lot of people are told they are not candidates for lasers. The authors rate their own evidence Level III. Read the number, though: 414 people across twelve trials is about thirty-five per trial, and 0.42 is a fraction of one grade on a scale where a full grade is the difference between rolling scars you notice and rolling scars you do not. Sitohang and colleagues, reviewing nine randomised trials in the International Wound Journal in 2021, land in the same place from the other direction: effective, well tolerated, and in need of larger samples and longer follow-up. The two reviews agree on direction and they agree on the limitation.
A trial of two hundred people or more, with scars graded from photographs by someone who does not know which arm the patient was in, and a follow-up at twelve months rather than at the end of the course. That last one is the gap that matters commercially: every clinic quotes a package of three to six sessions, and there is no good published evidence about what the scars look like a year after the last one. A trial reporting durability would move this either up or down, and it would be the first honest answer to the question people actually ask in the consultation.
It does not mean scars are erased. Nothing in either review measures erasure; they measure movement on a severity grade, and a scar that improves by a fraction of a grade is still a scar. It does not mean this works on every scar — the trials are about atrophic scarring, and boxcar, rolling and ice-pick scars do not respond alike. It does not transfer to the at-home roller, which does not reach the depth the trials used and was never what was tested. And it says nothing about the serum somebody applies afterwards, which is a separate claim with separate evidence and usually a separate price.
You are paying for a real, small, repeatable improvement, delivered by whoever is holding the pen. The evidence supports the procedure; it says nothing about the practitioner, and the depth and the number of passes are operator decisions that no clearance covers. So the useful questions in the consultation are the boring ones: what depth, how many sessions, what grade of scar am I, and what does the photograph at twelve months look like for someone like me. If a clinic will not put a number on the expected improvement, that is not because the number is secret. It is because the published one is 0.42.
Type and funding are stated because they change what a study is allowed to prove, and because a trial paid for by the company selling the thing is not disqualified — it is just not the same evidence as one that was not.