BioStacks
Best for
Ingredients (4)
Vitamin D3
100%Dose
1200 IU
Target
1000–5000 IU
Form
Premium
Zinc
50%Dose
7.5 mg
Target
15–30 mg
Form
Standard
Vitamin C
36%Dose
90 mg
Target
250–2000 mg
Form
Budget
Black Elder
17%Dose
50 mg
Target
300–600 mg
Form
—
Other Ingredients (10)
IsomaltSweetener
A poorly-absorbed sugar alcohol that can cause bloating, gas, and laxative effects at higher doses (EFSA notes laxative threshold for polyols). Tolerable for most, but cumulative across products.
MaltoseSweetener
Added sugar; contributes to glycemic load.
SorbitolSweetener
A FODMAP sugar alcohol that may trigger GI discomfort (bloating, gas) in individuals with IBS or sorbitol malabsorption, even at small amounts found in supplements. Avoided in low-FODMAP diets.
SucroseSweetener
Added sugars and high glycemic load; dental caries risk
SucroseSweetener
Added sugars and high glycemic load; dental caries risk
Natural FlavorsFlavor
Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.
StarchBinder
Carbohydrate polymer used as a binder, filler, and disintegrant in tablets and capsules
Vegetable OilCarrier
Edible oils used as carriers in softgels and as processing aids
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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.