BioStacks
Best for
Ingredients (7)
Vitamin D
100%Dose/day
2000 IU
Target
1000–5000 IU
Form
Premium
EpiCor dried Yeast Fermentate Complex
100%Dose/day
500 mg
Target
500–500 mg
Form
—
European Elder (Elderberry) (Sambucus nigra) extract
100%Dose/day
400 mg
Target
300–600 mg
Form
—
N-Acetyl-L-Cysteine
100%Dose/day
900 mg
Target
600–1800 mg
Form
—
Zinc
100%Dose/day
15 mg
Target
15–30 mg
Form
Standard
Other Ingredients (2)
Ascorbyl PalmitateAntioxidant
Fat-soluble form of vitamin C used as preservative
Capsule ShellCapsule
Generic capsule shell where the label does not specify the material. Common materials are hypromellose (HPMC) for vegetarian capsules and gelatin for traditional capsules — both are GRAS-listed and safe. Fish gelatin and pullulan variants also exist.
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
Split into 2 doses across the day
On the label
As a dietary supplement, take 2 capsules, twice daily, with meals, or as directed by a health professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$17.80
Near the median of 220 zinc 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.