BioStacks
Best for
Ingredients (3)
Calcium
100%Dose
1000 mg
Target
200–600 mg
Form
Premium
Magnesium
100%Dose
400 mg
Target
100–400 mg
Form
Budget
Potassium
100%Dose
99 mg
Target
99–500 mg
Form
Budget
Other Ingredients (5)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Vegetable/Confectioner's Glaze & WaxCoating
Plant-derived glaze or wax used as a tablet coating/polish.
How to Take It
Best taken in the evening
The Magnesium in it is what pulls this toward the evening. Take it with food — the potassium in it is what makes this kind of product feel nauseating on an empty stomach.
With food
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 four caplets once daily or as directed by a healthcare practitioner. Store tightly closed in a cool, dry place.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$24.76
Near the median 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.