BioStacks
Best for
Ingredients (4)
Vitamin D3
100%Dose
1000 IU
Target
1000–5000 IU
Form
Premium
Vitamin C
100%Dose
1000 mg
Target
250–2000 mg
Form
Not listed
Zinc
13%Dose
2 mg
Target
15–30 mg
Form
Not listed
Black Elderberry Extract
13%Dose
40 mg
Target
300–600 mg
Form
—
Other Ingredients
No other ingredients listed
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
Space it a couple of hours from Iron and Calcium
General guidance based on the ingredients, not a substitute for the label or your doctor.
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the 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. studied 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.