BioStacks
Best for
Ingredients (4)
Calcium
100%Dose
400 mg
Target
200–600 mg
Form
Not listed
Magnesium
100%Dose
200 mg
Target
100–400 mg
Form
Not listed
Magnesium Oxide
100%Dose
200 mg
Target
100–400 mg
Form
Budget
Vitamin D
20%Dose
200 IU
Target
1000–5000 IU
Form
Premium
Other Ingredients (2)
Titanium DioxideColorant
Banned in the EU (2022) over concerns that its ultra-fine particles may damage DNA in gut cells. Still allowed in the US. Used only for white coloring — provides no health benefit.
GelatinCapsule
Protein derived from collagen, used in traditional capsule shells
How to Take It
Best taken in the evening
The Magnesium in it is what pulls this toward the evening. Take it with a meal containing fat — the vitamin D in it absorbs poorly without one.
With a meal containing fat
Keep it away from high-oxalate foods like spinach
Space it a couple of hours from Iron and Zinc
On the label
As a dietary supplement, take two capsules daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$26.99
Pricier than 79% of 586 vitamin D 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.