ingestible · for cravings & habit-breaking
N-Acetylcysteine (NAC)
Reviewed by the Nimbera editorial team · Last updated May 2026
How to use
Take 600-1800 mg NAC daily, typically split into two doses with meals. Most craving-focused studies used 1200-1800 mg/day. Allow 4-8 weeks to assess full benefit. Often stacked with behavioral support.
How it works
NAC restores glutamate homeostasis in the nucleus accumbens (the brain reward center) by replenishing cysteine for glutathione synthesis and modulating glutamate transporter activity. Dysregulated glutamate signaling underlies compulsive craving behavior. NAC also reduces neuroinflammation associated with addiction pathways.
Where to buy
Pharmacies (often in the supplement aisle), health food stores, Amazon. Widely available as 600 mg capsules.
Typical cost: $15-30/month
Safety notes
Can interact with nitroglycerin (causes hypotension) and some chemotherapy drugs. May cause GI upset, nausea, or headache at higher doses. People with asthma should use caution - inhalation of NAC powder can cause bronchospasm.
Drug & supplement interactions
- Always tell your doctor or pharmacist about any supplements you take.
- Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
- Herbal remedies can affect how the body absorbs or metabolises drugs.
- Check drugs.com interactions checker before starting.
Clinical source
PubMed - Deepmala et al. 2017This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.