BioStacks
Best for
Ingredients (5)
Quercetin
90%Dose
450 mg
Target
500–1000 mg
Form
—
Vitamin C
100%Dose
300 mg
Target
50–250 mg
Form
Budget
Stinging Nettles extract
100%Dose
550 mg
Target
300–600 mg
Form
Budget
N-Acetyl-L-Cysteine
10%Dose
60 mg
Target
600–1800 mg
Form
—
Bromelain
140 mgUnit not recognized — not scored
Other Ingredients (3)
Rice FlourFiller
Rice-based ingredients carry risk of inorganic arsenic contamination (FDA and Consumer Reports). Rice accumulates arsenic from soil at higher rates than other grains. Used as a cheap filler — adds nothing beneficial.
Calcium CarbonateBuffer
Common calcium salt used as a buffering agent, filler, or mineral fortification in supplements
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
How to Take It
Take it anytime
Poorly absorbed on its own — take with a fat-containing meal.
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.
On the label
Loading Dose Take 2 capsules three times daily for 7-10 days or as recommended.Maintenance Take 2 capsules daily or as recommended.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$30.50
Near the median of 292 immune 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.