N-Acetylcysteine (NAC)
Mentioned 2 times across 2 shows · first heard Feb 2026 on SmartLess.
The general take
Andrew Huberman is a regular NAC user who thinks it's worth increasing his dosage during travel and winter when he's around sick people, citing data showing it can reduce flu transmission. He seems to view it as a practical immune support tool, though he was cut off before fully explaining the evidence.
About
FREE RADICAL PROTECTION*: Take 1 NAC veggie capsule with selenium and molybdenum twice daily for free radical protection and to maintain cellular health* · IMPORTANT NOTE ABOUT THIS PRODUCT: Black spots may appear in NAC because of a normal oxidative reaction, but product is safe to consume. These spots are NOT mold or any other micro-contamination. Micro-testing has been performed to assess product safety · CERTIFICATIONS/CLASSIFICATIONS: Non-GMO, Vegan/Vegetarian, Made without Gluten, Kosher, Dairy Free, Egg Free, Nut Free, Soy Free, UL Certified · GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
Who said what
- DJ
Dr. Josh Axe👍 Recommends
…recommending NAC as key supplement for glutathione production and liver detoxification
“Number two, N-acetylcysteine. One of those key amino acids needed for liver function, we talked about glycine earlier, but cysteine is really important for liver function and N-acetylcysteine is a key precursor to glutathione, which again, as I talked about, it's the liver's most important internal antioxidant and detoxification compound. So making sure you're getting, and I would say you want to be doing at least 600 milligrams daily.”
The Dr. Josh Axe Show — Hidden Signs Your Liver Is Sluggish (And What To Do Before It Becomes Serious)at 41:53 
Andrew Huberman👍 Recommends
…supplements to help prevent flu and support immune function
“N-acetylcysteine, also called NAC, is a glutathione precursor. There's a beautiful study showing that when people signed up for a study where they were deliberately exposed to people who had flu. And they either got NAC two or three times a day at about 600 to 900 milligrams per day or not.”
SmartLess — "Andrew Huberman"at 15:36
Listener reviews
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