BioStacks
Best for
Ingredients (4)
Vitamin D
100%Dose
2500 IU
Target
1000–5000 IU
Form
Premium
Vitamin K
100%Dose
90 mcg
Target
90–200 mcg
Form
Standard
Vitamin K
100%Dose
120 mcg
Target
90–200 mcg
Form
Budget
Vitamin K
33%Dose
30 mcg
Target
90–200 mcg
Form
Premium
Other Ingredients (5)
Rice ExtractFiller
Rice-based ingredients carry risk of inorganic arsenic contamination. Vague labeling — 'rice extract' does not specify what is extracted or standardized. Used as a cheap filler with no supplemental benefit.
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
HypromelloseCapsule
Plant-derived capsule material from cellulose
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
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
On the label
One tablet daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$14.24
Near the median of 552 vitamin D supplements
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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.