BioStacks
Best for
Ingredients (7)
Calcium
100%Dose
800 mg
Target
200–600 mg
Form
Premium
Microcrystalline Hydroxyapatite concentrate
100%Dose
2000 mg
Target
200–600 mg
Form
Standard
Phosphorus
100%Dose
180 mg
Target
100–500 mg
Form
Standard
Vitamin D3
40%Dose
400 IU
Target
1000–5000 IU
Form
Premium
Magnesium
100%Dose
100 mg
Target
100–400 mg
Form
Not listed
Other Ingredients (3)
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
HypromelloseCapsule
Plant-derived capsule material from cellulose
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
Take four capsules per day or as directed by your healthcare practitioner.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$35.90
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.