BioStacks
Best for
Ingredients (7)
Vitamin D3
100%Dose
2680 IU
Target
1000–5000 IU
Form
Premium
Zinc
67%Dose
10 mg
Target
15–30 mg
Form
Standard
Vitamin C
46%Dose
115 mg
Target
250–2000 mg
Form
Budget
Vitamin A
71%Dose
500 mcg RAE
Target
700–1500 mcg
Form
Standard
Andrographis Extract
34%Dose
67 mg
Target
200–600 mg
Form
—
Other Ingredients (1)
HypromelloseCapsule
Plant-derived capsule material from cellulose
How to Take It
Take it anytime
Fat-soluble — take with your largest fat-containing meal. Time of day doesn't matter.
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.
Space it a couple of hours from Iron and Calcium
On the label
One to three (1-3) capsules daily or as directed by a healthcare professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$42.00
Pricier than 83% of 75 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.