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NAC with Mounjaro: dose, stomach symptoms and liver and glucose results

Record the NAC product and dose, why you take it, stomach symptoms in the weeks around each Mounjaro dose step, and any liver or glucose results, so your prescriber sees both treatments together. The facts box shows what the NAC trials on this page actually measured.

Companion to “Can I Take N-Acetylcysteine (NAC) with Mounjaro?” · healthrx.com/supplements-mounjaro/with-nac · Facts checked 2026-10-19

Your NAC

Product and strength
Daily dose and timingwith food?
Reason you take itPCOS, liver, antioxidant, other
Start date
Mounjaro dose and date of the last increase

Weekly stomach symptom log

WeekMounjaro dose (mg)NAC dose (mg/day)NauseaVomitingDiarrheaNotes

Lab results

DateALTASTFasting glucoseHbA1c

What the evidence shows

  • In a meta-analysis of PCOS trials, NAC raised the odds of pregnancy against placebo (odds ratio 3.58) but lowered them against metformin (0.40).[1]
  • The same review found no significant change in insulin, testosterone or BMI with NAC compared with placebo.[1]
  • In a 3-month fatty liver trial, NAC 600 mg every 12 hours lowered ALT compared with vitamin C, with no change in the grade of steatosis.[2]
  • On Mounjaro, most reports of nausea, vomiting and diarrhea come during dose escalation and decrease over time.[3]
  • Mounjaro slows stomach emptying and may affect the absorption of medicines taken by mouth.[3]

Questions for your prescriber

  1. Is NAC worth taking for my reason, given what the trials found?
  2. Should I wait until my Mounjaro dose is stable before starting NAC?
  3. Do I need ALT or glucose checks while taking both?
  4. If I have PCOS and want to conceive, would metformin be a better option than NAC?
  5. Which stomach symptoms should make me stop NAC and call?
Sources for the facts on this sheet
  1. Thakker D, Raval A, Patel I, Walia R. N-acetylcysteine for polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled clinical trials. Obstet Gynecol Int 2015. PMID 25653680. https://pubmed.ncbi.nlm.nih.gov/25653680/
  2. Khoshbaten M, Aliasgarzadeh A, Masnadi K, et al. N-acetylcysteine improves liver function in patients with non-alcoholic Fatty liver disease. Hepat Mon 2010. PMID 22308119. https://pubmed.ncbi.nlm.nih.gov/22308119/
  3. Eli Lilly and Company, via DailyMed. Mounjaro (tirzepatide) injection, for subcutaneous use: prescribing information and Medication Guide. Effective 2026-08-27. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0

This sheet records information for a conversation with your prescriber or pharmacist. It does not replace their instructions or the medication's prescribing information.