The Tale of the Needle and the Hair Follicle
There is a rumor spreading through the hair loss community, a whisper from a certain English medical editor—let us call him Rob—who claims that microneedling alone can regrow hair. He says he has scientific proof. But as with many tales in the world of hair, the truth is far more tangled.
Rob is not new to this stage. A couple of years ago, he published a review article on microneedling for androgenic alopecia. I have walked through that article myself, needle by needle, and I must be frank: it was a shaky foundation. The vast majority of microneedling studies combine the treatment with something proven, most often topical minoxidil, which is an FDA-approved hair loss therapy. In Rob’s review, he found six studies that used microneedling alone, with a total of 105 subjects. According to him, half showed positive results, half showed none. But here is the catch: not a single one of those studies included a true placebo control group.
Why does that matter? Because hair is a fickle thing. Season by season, the percentage of hairs in the growth phase, the number shed each day, and even the thickness of each strand can shift spontaneously, even in people with androgenic alopecia. Placebo treatments can also trigger real change—the mechanism is not fully understood, but the placebo effect is very real, as is its dark twin, the nocebo effect. Consider the phase three trial of pyrilutamide. Before and after, there was a statistically significant increase in hair counts. But when compared to a placebo group, the difference vanished. Without that control group, the world would have hailed pyrilutamide as a miracle. The same illusion haunts microneedling studies.
Digging into Rob’s six studies, the problems multiply. Three of them were not simple microneedling at all—they involved electrical currents or high-frequency oscillating devices. And every single study that compared microneedling alone to microneedling plus minoxidil found the combination was superior. That is the real power of microneedling: it creates tiny channels in the epidermis that allow minoxidil to penetrate deeper into the hair follicles. That is its only proven mechanistic benefit. Yet even the studies that Rob cites as positive for standalone microneedling do not actually claim that. One study, which Rob says shows a benefit, concludes that “microneedling combined with 5% minoxidil can be an effective treatment.” Not microneedling alone. And when Rob calls three studies negative, he glosses over the fact that in one of those, hair counts actually decreased with microneedling alone compared to a combination with a topical growth factor.
The chaos of microneedling protocols only deepens the confusion. There is no standardized approach. Needle length, diameter, density, pressure, device type—roller, stamp, pen—application duration, frequency, follow-up period, and whether you combine it with other drugs. This is a classic “no true Scotsman” fallacy. If a study shows no benefit, a believer will always say, “Ah, they used the wrong device or the wrong needle length.” With so many variables, any critique can be deflected.
And so we arrive at Rob’s latest video and a new study he champions. His argument is simple: earlier studies failed because they did not use the right needle length. He claims the ideal length is very short, far shorter than the older advice of drawing blood. He takes as a given that standalone microneedling works—if you do it correctly. He begins by touting microneedling’s success for acne scars, as if that proves something about hair loss, which is a lifelong condition requiring lifelong commitment. Then he quotes a 2013 study that supposedly showed great results. He fails to mention that study was not about standalone microneedling; it compared microneedling plus minoxidil to minoxidil alone. The improvement came from absorption, not from some mysterious inflammatory activation or calcification breakdown. Those fanboy theories have zero evidence.
Even if such theories were true, we have no long-term safety data on repeated microneedling. Repeated skin injury leads to fibrosis. Short-term inflammation may stimulate hair follicles, but long-term inflammation is never good—it is the root of many diseases. There are safer ways to boost minoxidil efficacy. Tretinoin upregulates the sulfotransferase enzyme that converts minoxidil into its active form, minoxidil sulfate. Or you can use higher concentrations of topical minoxidil, 10% or 15%, which work better for poor responders to 5%. But why risk puncturing your skin repeatedly? The scalp is not the cleanest place, and cases of fungal infections and strange skin reactions from microneedling have been reported. The longer you do it, the greater the risk.
But Rob is not worried about proving that standalone microneedling works—he takes that for granted. His interest is in tweaking one parameter: needle depth. He points to an earlier study that compared 0.5 mm to 1.2 mm depth, but again, that study used minoxidil alongside the needles. The shallower depth worked better. My take: the less invasive, the better. You barely need to penetrate the epidermis to let minoxidil through. Deeper injury may actually harm hair growth, contrary to the inflammation theory.
Now, the new study that excites Rob. Forty-five subjects with androgenic alopecia from Egypt—31 women, 14 men. No mention of the severity of their hair loss (no Hamilton-Norwood or Ludwig scales), which is a glaring omission. They were divided into three groups of fifteen, all treated with a dermapen every two weeks for three months. Group A at 0.5 mm depth, Group B at 1 mm, Group C at 1.5 mm. Two blinded dermatologists assessed results on a 100-point scale. The clinical ratings: moderate improvement for 0.5 mm and 1 mm, poor for 1.5 mm. But to see actual hair counts, you have to dig into a supplementary table. Group A’s hair count rose from a mean of 7.67 to 12.6. Group B barely moved: 7.27 to 8.93. Group C actually decreased: 5.8 to 5.67. The authors concluded that 0.5 mm is optimal, and Rob agrees.
Yet this study is deeply flawed, and even Rob mentions some of the flaws but dismisses them. There was no control group. Without one, seasonal variations and the placebo effect make any conclusion impossible. This is especially critical in a short 12-week study. Furthermore, Group A had the highest baseline hair density, meaning they likely had less severe alopecia. With only 15 subjects per group, such random differences can skew everything. It is even possible that all groups could have done worse than an untreated control. Without a control, a blinded observer still knows every subject is receiving an active treatment—conscious or unconscious bias can exaggerate results. And indeed, the investigators claimed all patients showed clinical improvement, yet Group C was rated poor and hair counts dropped. The data table is buried in an online supplement; most readers will never see it.
Look back at the 2013 study Rob cited early in his video: it used 1.5 mm needles and got good results—but only because of the minoxidil. The needle length likely had little to do with it. The pattern from the new study suggests that shallower depth causes less injury and hence better results. That makes perfect sense. But it does not prove standalone microneedling works.
And what about the long term? A 12-week study tells us nothing about years of treatment. Hair loss is a lifelong condition. Repeated injuries to the epidermis and dermis could easily lead to scar tissue buildup in the scalp—scar tissue being the end result of androgenic alopecia. Even if microneedling boosts minoxidil absorption, it is not a practical long-term solution. Tretinoin or higher minoxidil concentrations are safer and more effective.
Rob’s bias is clear. He runs a website promoting non-drug interventions. He previously pushed the bogus scalp tension theory (which I, the hair loss witcher, helped dismantle, but I will not dwell on that). Now he has pivoted to microneedling as his new drug-free gimmick to maintain his business. I have nothing against exploring theories, but androgenic alopecia cannot be halted without powerful pharmaceutical treatments. Every moment wasted on coping therapies like massage or microneedling is hair you will never get back.
And what about that one YouTuber who claims he regrew nearly all his hair with just microneedling and a coffee mask? I will not name him—he is an attention seeker. But consider this: he says he used dutasteride and minoxidil for years with zero results, then switched to microneedling and ground coffee and got dramatic regrowth. Think about that. Dutasteride is the most powerful 5-alpha-reductase inhibitor on the market, and minoxidil is the most powerful growth stimulant. Together, they did nothing—but coffee beans and needles worked? That defies all evidence. The truth is much simpler: he likely regrew his hair through conventional methods but needed a sensational story to get views. And impressionable viewers fall for it.
My counsel, offered as a friend: toss your microneedling devices into a paint bucket. Stick with what is clinically proven—finasteride and minoxidil. Microneedling is not worth the risk, even at shallow depths or combined with minoxidil. Any limitations of existing treatments can be addressed more safely with tretinoin or higher minoxidil concentrations. Microneedling had its moment in the spotlight, but now it is time for the hair loss community to move on and focus on better treatments.