BioStacks
Best for
Ingredients (3)
N-Acetyl-L-Cysteine
83%Dose
500 mg
Target
600–1800 mg
Form
—
Milk Thistle Seed Extract
100%Dose
300 mg
Target
150–600 mg
Form
Budget
Broccoli, Powder
1%Dose
50 mg
Target
5000–15000 mg
Form
—
Other Ingredients (2)
HypromelloseCapsule
Plant-derived capsule material from cellulose
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
How to Take It
Take it anytime
What's in this absorbs poorly without a fat-containing meal — take it with one.
With a meal containing fat
NAC does better on an empty stomach, but something else in this bottle needs food. Taking the whole product with a meal is the better trade — an upset stomach is why most people stop.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$51.61
Pricier than 92% of 77 NAC supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.