Condition
Marijuana Withdrawal
Do any supplements help marijuana withdrawal? No supplement has been shown to ease cannabis withdrawal. N-acetylcysteine (NAC) is the best studied: in one trial of 116 teens and young adults it more than doubled the odds of urine tests free of cannabis, but a trial of 302 adults and a newer trial of 192 young people found no benefit, so the evidence is limited. Withdrawal affects about half of regular users. Irritability, anxiety, poor sleep and low appetite usually start 1 to 2 days after stopping, peak around days 2 to 6 and fade over a few weeks. Counseling is the first-line help. If you have thoughts of harming yourself, get help right away.
Sources: PMID 22706327; PMID 28623823; PMID 39910268; PMID 32271390; PMID 34791767
What the evidence says
- N-acetylcysteine (NAC) helped in one trial and not in two others, so the evidence is limited. In 116 cannabis-dependent people aged 15 to 21, NAC 1,200 mg twice a day for 8 weeks, added to a reward-based counseling program, more than doubled the odds of urine tests free of cannabis.
- In 302 adults aged 18 to 50, the same dose for 12 weeks made no difference: 22.3% of urine tests were negative with NAC and 22.4% with placebo. A 2025 trial in 192 people aged 14 to 21, without the reward program, also found no difference.
- A 2025 Cochrane review of 37 trials with 3,201 people found no medicine approved for cannabis use disorder. Stopping cannabis was no more likely with NAC (2 trials, 270 people) or THC preparations than with placebo, and the reviewers call all of these options experimental.
- We found no trials of omega-3s, magnesium or other supplements for cannabis withdrawal symptoms.
- Withdrawal is common: a review of 47 studies with 23,518 regular or dependent users found it in 47% of them. Symptoms start 24 to 48 hours after stopping, peak around days 2 to 6, and some last 3 weeks or more in heavy users. Supportive counseling and education are the first-line approach.
- In small lab studies of 12 daily smokers, stopping cannabis raised anxiety, irritability and stomach pain and cut food intake.
Safety and when to see a clinician
- If you have thoughts of suicide or self-harm, call or text 988 in the US, or your local emergency number, now.
- Withdrawal can be more complicated for people with other mental health conditions or who use other drugs or alcohol. Some need care in a clinic or hospital, so talk to a clinician before you stop if that applies to you.
- NAC caused more stomach and gut side effects than placebo in a trial of young people (63 of 98 versus 37 of 94).
- If you are pregnant, breastfeeding or under 18, ask a clinician before taking any supplement for withdrawal.
The Cannabis Withdrawal Support protocol
2 primary supplements · 5 supporting supplements
- NAC (N-Acetyl Cysteine)1,200–2,400 mg daily in divided doses
- Omega-3 Fatty Acids2–3 g EPA+DHA daily
Studies cited
8 studies from PubMed
- A double-blind randomized controlled trial of N-acetylcysteine in cannabis-dependent adolescents.
- A randomized placebo-controlled trial of N-acetylcysteine for cannabis use disorder in adults.
- N-acetylcysteine for youth cannabis use disorder: randomized controlled trial main findings.
- Pharmacotherapies for cannabis use disorder.
- Prevalence of Cannabis Withdrawal Symptoms Among People With Regular or Dependent Use of Cannabinoids: A Systematic Review and Meta-analysis.
- Clinical management of cannabis withdrawal.
- Abstinence symptoms following smoked marijuana in humans.
- Abstinence symptoms following oral THC administration to humans.