NAC for Skin Picking: A Quiet Win for an Underdiagnosed Condition
- Joyce Knieff, ND, LAc
- May 7
- 5 min read
If you've ever lost twenty minutes in the bathroom mirror picking at a single bump on your face, and then felt that strange mix of relief and shame afterward, you're not alone. Excoriation disorder, the medical name for compulsive skin picking, sits in a category of conditions that almost no one talks about. It's underdiagnosed and undertreated. And there's a reasonably-priced amino acid supplement with meaningful evidence behind it.
What the research found
The trial getting renewed attention is a randomized, double-blind, placebo-controlled study by Jon Grant and colleagues at the University of Chicago and the University of Minnesota, published in JAMA Psychiatry in 2016. Sixty-six adults with skin-picking disorder were randomized to either N-acetylcysteine (NAC), an oral amino acid supplement, at doses ranging from 1,200 to 3,000 mg per day, or placebo, for 12 weeks.
The results were meaningful. On the modified Yale-Brown Obsessive Compulsive Scale, NAC scored significantly better than placebo (P = .048). On a clinician-rated severity scale, the difference was clearer (P = .003). At study's end, 47% of participants on NAC were rated "much improved" or "very much improved," compared with 19% on placebo (P = .03). Side effects were mild. Of the 53 participants who finished the study, the supplement was well tolerated.
The proposed mechanism is interesting. NAC is a precursor to glutathione, the body's master antioxidant. It also modulates extracellular glutamate in a brain region called the nucleus accumbens, which is involved in compulsive and reward-driven behaviors. The same pathway is why NAC has been studied for trichotillomania (hair-pulling), problem gambling, and substance use. NAC is neither a sedative nor an SSRI, nor is it a behavioral intervention. What it offers is a nudge to brain chemistry that seems to make compulsive urges easier to resist.
The bigger picture
The Grant trial isn't the only data point. A 2021 Cochrane systematic review of medications for trichotillomania, a closely related body-focused repetitive behavior, concluded that NAC showed probable benefit in adults at the 12-week mark, with about 56% of NAC-treated adults responding compared to 16% of placebo. The same review found NAC didn't help much in children and adolescents, which is worth knowing.
A 2022 review of NAC for obsessive-compulsive and related disorders in pediatric populations echoed that picture: helpful in some studies, not in others, and most useful as an add-on rather than a stand-alone treatment. The doses studied in kids and teens cluster around 2,400 to 2,700 mg/day in divided doses, with mild side effects.
There's also a recent 2025 placebo study from the University of Graz worth knowing about. Researchers gave participants pills labeled as N-acetylcysteine and tracked their skin-picking with daily smartphone check-ins. Even when the pills were inert, retrospective questionnaires showed reduced symptoms. Daily app-based ratings showed a more modest effect, only on urge to pick, only in the second week. So the expectation that NAC will help carries some of its own weight. That's worth holding lightly: it doesn't mean NAC doesn't work, yet it does mean the placebo response in this condition is substantial and probably contributes to outcomes in everyday clinical use.
The naturopathic lens
Skin picking is a body-focused repetitive behavior, or BFRB. The category also includes hair-pulling, nail-biting, and compulsive cheek- or lip-chewing. These behaviors often track with anxiety, OCD traits, ADHD, perfectionism, and sometimes histories of unmet sensory or emotional needs. They tend to ramp up under stress, boredom, or transitions. Those are moments when the nervous system is dysregulated and the body reaches for self-soothing in a way that ends up causing harm.
Naturopathic care of BFRBs sits at the intersection of nervous system regulation, sensory awareness, and addressing what's underneath. NAC is one tool. Sleep is another. Steady blood sugar matters too, since hypoglycemic dips can drive both anxiety and the urge to fidget compulsively. Inflammatory triggers in the gut and on the skin are worth identifying, since itch and skin sensation can become entry points for picking. So are the stimulants we're using to power through the day; caffeine on a frayed nervous system raises the floor on compulsive behaviors.
What I keep finding most useful in clinic is the question: what is this behavior doing for you? Picking is rarely random. Sometimes it regulates arousal during a boring task. Other times it's a private grief moment for someone whose nervous system is asking for stillness it doesn't get anywhere else. Now and then it's a remnant of a body that learned, very young, to stay quiet by causing itself small pain. The clinical job isn't just to suppress the behavior. It's to help the person find what they're actually reaching for, and then build a wider menu of ways to get it.
NAC can lower the noise. The harder, more interesting work happens after.
Conclusions to draw from this
A few starting points if skin picking is a struggle for you or someone you love:
Get a real assessment first. Excoriation disorder is a recognized diagnosis with criteria. Many people who pick assume they're "just bad at stopping." A clinician familiar with BFRBs, often a therapist trained in habit reversal training, can change the conversation entirely.
Consider behavioral therapy. Habit reversal training (HRT) and the more comprehensive behavioral model (ComB) are the strongest non-medication approaches. Online programs and the TLC Foundation for BFRBs are good starting points.
Talk to a clinician before adding NAC. Doses studied for skin picking range from 1,200 to 3,000 mg per day. NAC has interactions with some medications, can affect blood pressure regulation, and isn't appropriate for everyone. This is one to discuss with someone who knows your history rather than self-prescribe at the highest dose you can find.
Stabilize the substrate. Sleep, blood sugar, caffeine, stress regulation. None of these will "cure" picking, though a dysregulated nervous system makes every BFRB louder.
Track triggers without judgment. A simple daily note (when, where, what was happening, how you felt before and after) turns a vague struggle into something with edges. That's the foundation behavioral therapy works from.
Hide the mirrors that hurt. Magnifying mirrors in good light are a known accelerator. Most BFRB clinicians recommend removing them.
You aren't broken. You're a nervous system trying to regulate with the tools it's got. There are better tools.
References
Grant JE, Chamberlain SR, Redden SA, et al. N-Acetylcysteine in the Treatment of Excoriation Disorder: A Randomized Clinical Trial. JAMA Psychiatry. 2016;73(5):490-496. PMID: 27007062. https://doi.org/10.1001/jamapsychiatry.2016.0060
Hoffman J, Williams T, Rothbart R, et al. Pharmacotherapy for trichotillomania. Cochrane Database Syst Rev. 2021;9(9):CD007662. PMID: 34582562. https://doi.org/10.1002/14651858.CD007662.pub3
Parli GM, Gales MA, Gales BJ. N-Acetylcysteine for Obsessive-Compulsive and Related Disorders in Children and Adolescents: A Review. Ann Pharmacother. 2023;57(7):847-854. PMID: 36384314. https://doi.org/10.1177/10600280221138092
Schienle A, Kohlhofer S, Wilhelm J, Tanzmeister S. A randomized crossover trial with experience sampling to test placebo effects on pathological skin-picking. Sci Rep. 2025;15(1):22782. PMID: 40592945. https://doi.org/10.1038/s41598-025-04360-2
Everything here is for educational purposes. It's not a substitute for working with a provider who actually knows your history. If skin picking is interfering with your daily life or causing significant distress, please reach out to a clinician trained in BFRBs.
If this resonates with what you're experiencing and you'd like to explore a naturopathic approach, book a consultation with our clinic.
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