BioStacks
Best for
Ingredients (4)
Selenium
100%Dose/day
200 mcg
Target
100–200 mcg
Form
Premium
Alpha-Lipoic Acid
100%Dose/day
400 mg
Target
300–600 mg
Form
Budget
Milk Thistle extract
100%Dose/day
525 mg
Target
150–600 mg
Form
Budget
N-Acetyl-L-Cysteine
67%Dose/day
400 mg
Target
600–1800 mg
Form
—
Other Ingredients (5)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
HypromelloseCapsule
Plant-derived capsule material from cellulose
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
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
ALA 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.
Split into 2 doses across the day
On the label
Take one capsule twice daily, or as directed by your healthcare professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$64.86
Pricier than 95% of 74 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.