BioStacks
Best for
Ingredients (8)
Vitamin D-3
100%Dose
5000 IU
Target
1000–5000 IU
Form
Premium
Quercetin
100%Dose
1000 mg
Target
500–1000 mg
Form
—
Zinc
100%Dose
40 mg
Target
15–30 mg
Form
Standard
N-Acetyl Cysteine
100%Dose
1000 mg
Target
600–1800 mg
Form
—
Vitamin C
100%Dose
800 mg
Target
50–250 mg
Form
Budget
Nutrition
Calories, macros & sodium.
- Sodium10 mg
Other Ingredients (6)
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
Hydroxypropyl CelluloseBinder
An inert modified-cellulose polymer used as a binder, film-former, and disintegrant.
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
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
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.
Keep it away from medication and mineral supplements
Space it a couple of hours from Iron and Calcium
On the label
Take 3 tablets daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$23.66
Near the median of 544 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.