BioStacks
Best for
Ingredients (4)
Magnesium
100%Dose
300 mg
Target
100–400 mg
Form
Standard
Calcium
100%Dose
600 mg
Target
200–600 mg
Form
Budget
Coral Calcium
100%Dose
1000 mg
Target
200–600 mg
Form
Budget
Vitamin D3
20%Dose
200 IU
Target
1000–5000 IU
Form
Premium
Other Ingredients (4)
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
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
3 capsules daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$16.85
Cheaper than 68% of 638 calcium 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.