BioStacks
Best for
Ingredients (4)
Vitamin D3
100%Dose
5000 IU
Target
1000–5000 IU
Form
Premium
Zinc
100%Dose
15 mg
Target
15–30 mg
Form
Premium
Vitamin C
100%Dose
1000 mg
Target
250–2000 mg
Form
Budget
Elderberry Fruit Extract
33%Dose
100 mg
Target
300–600 mg
Form
—
Other Ingredients (5)
MaltodextrinBinder
Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.
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
GelatinCapsule
Protein derived from collagen, used in traditional capsule shells
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
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
On the label
As a dietary supplement, take two capsules per day with food and water.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$12.49
Cheaper than 79% 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.