THORNE NAC, 500 mg N-Acetylcysteine, Amino Acid Supplement, 180 Capsules…

Our verdict

THORNE NAC, 500 mg N-Acetylcysteine, Amino Acid Supplement… works out to $0.35 per serving of nac, at 500mg per serving in capsule form. That puts it above the median of the 70 nac products we can price per dose, where the typical serving costs $0.16, a Value Index of 0.5 where the median product is 1.0. One container lasts 180 days at the label dose of 1 serving a day, about $10.50 a month. Thorne appears in the NSF Sport public registry. Worked out from the current retail price as of 2026-11-13; confirm the live price on Amazon.com before buying.