BioStacks
Best for
Ingredients (7)
Zinc
67%Dose
10 mg
Target
15–30 mg
Form
Premium
Vitamin D3
40%Dose
400 IU
Target
1000–5000 IU
Form
Premium
Vitamin C
60%Dose
150 mg
Target
250–2000 mg
Form
Budget
Astragalus root extract
75%Dose
150 mg
Target
200–500 mg
Form
—
Reishi Mushroom
30%Dose
300 mg
Target
1000–3000 mg
Form
—
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
Take it with a meal containing fat — the vitamin D in it absorbs poorly without one.
With a meal containing fat
Space it a couple of hours from Iron and Calcium
On the label
Take 2 capsules daily as a dietary supplement, preferably with meals, or as directed by your health practitioner.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$16.70
Cheaper than 76% 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.