N-Acetylcysteine (NAC) at 1200-3000 mg/day
N-acetylcysteine (NAC) is the supplement recommended for skin picking disorder (dermatillomania), with dosing typically starting at 1200 mg/day and titrating up to 3000 mg/day based on response. This recommendation is based on the only randomized controlled trial specifically examining supplements for this condition 1.
Evidence Supporting NAC
The landmark 2016 randomized, double-blind trial demonstrated that NAC was significantly superior to placebo for reducing skin-picking symptoms 1. Key findings include:
- 47% of NAC-treated patients showed marked improvement compared to only 19% on placebo (P = .03)
- Significant reductions in symptom severity scores (Yale-Brown scale improved from 18.9 to 11.5 in treatment group vs. 17.9 to 14.1 in placebo, P = .048)
- Well-tolerated with minimal side effects
- NAC works by restoring extracellular glutamate concentration in the nucleus accumbens, targeting the underlying neurobiological mechanism
Clinical Implementation
Start with NAC 1200 mg daily and increase to 2400-3000 mg/day over several weeks as tolerated 1. The medication should be continued for at least 12 weeks to assess full therapeutic response, as this was the trial duration that demonstrated efficacy.
Multiple recent reviews consistently recommend NAC as a first-line pharmacologic option given its moderate efficacy combined with low side effect profile 2, 3. A 2025 systematic review confirms NAC as "well-established in the treatment of SPD" alongside SSRIs 4.
Important Caveats
- NAC is a supplement, not FDA-approved specifically for skin picking disorder—no medications currently have this indication 5
- Behavioral therapy (habit reversal training) remains the gold-standard first-line treatment and should ideally be combined with NAC 2, 6
- If NAC fails after adequate trial (12+ weeks at therapeutic dose), consider SSRIs or referral to psychiatry for additional pharmacologic options 4, 2
- NAC should be considered for all severity levels given its favorable risk-benefit profile 2
The glutamate system appears to be a key therapeutic target in compulsive skin picking, making NAC's mechanism of action particularly relevant to the underlying pathophysiology 1.