BioStacks
Best for
Ingredients (6)
Vitamin D3
100%Dose
4000 IU
Target
1000–5000 IU
Form
Premium
Vitamin K2 from Natto
100%Dose
150 mcg
Target
90–200 mcg
Form
Premium
Magnesium
100%Dose
264 mg
Target
100–400 mg
Form
Standard
Calcium
100%Dose
1200 mg
Target
200–600 mg
Form
Budget
Strontium
2%Dose
8 mg
Target
340–680 mg
Form
Budget
Other Ingredients (8)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Citric AcidAcidulant
Natural acid derived from citrus fruits
GlycerinHumectant
Sweet-tasting liquid used in soft capsules and liquids
HypromelloseCapsule
Plant-derived capsule material from cellulose
Sodium CarbonatesBuffering Agent
Alkaline buffering agents used to adjust pH and improve stability of supplement formulations
Croscarmellose SodiumDisintegrant
Cross-linked cellulose derivative used as a superdisintegrant
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
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 vitamins D and K in it absorb 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
Adults take 4 tablets daily, preferably with food. For best results, take 2 tablets twice daily with food. Not formulated for children. Do not exceed recommended dose.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$31.51
Pricier than 81% of 294 calcium 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.