BioStacks
Best for
Ingredients (5)
Vitamin C
100%Dose
300 mg
Target
50–250 mg
Form
Budget
Quercetin Dihydrate
80%Dose
400 mg
Target
500–1000 mg
Form
—
Stinging Nettles
100%Dose
400 mg
Target
300–600 mg
Form
Budget
N-Acetyl-L-Cysteine
8%Dose
50 mg
Target
600–1800 mg
Form
—
Bromelain
100 mgUnit not recognized — not scored
Other Ingredients (4)
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
HypromelloseCapsule
Plant-derived capsule material from cellulose
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
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 2 capsules three times per day for 7-10 days. Maintenance 2 or more capsules per day or as recommended by your health care professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$74.80
Pricier than 96% of 545 vitamin C 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.