You're getting **Calcium** at 667mg and **Magnesium** at 333mg per serving — both within the supplemental range used in bone health research. The softgel format uses rice bran oil as a carrier, which helps the included **Vitamin D3** absorb since it's fat-soluble. That D3 in turn supports calcium absorption, and **Magnesium** helps activate D3 in your body — two synergies working in your favor.
The main limitation is dosing and form quality. **Vitamin D3** at just 400 IU sits well below the 1,000–5,000 IU range most practitioners recommend — you'd need to supplement D3 separately to reach a meaningful dose. **Zinc** is provided as zinc oxide, a form your body absorbs poorly compared to alternatives like picolinate or bisglycinate. At 25mg, the dose is solid on paper, but the oxide form means you're likely absorbing only a fraction.
One practical note: your body absorbs calcium less efficiently above 500mg per dose. Since this delivers 667mg in a single two-softgel serving, splitting the dose — one softgel with breakfast, one with dinner — would help you absorb more of what you're paying for.
BioStacks
Best for
Ingredients (4)
Vitamin D
40%Dose
400 IU
Target
1000–5000 IU
Form
Premium
Calcium
100%Dose
667 mg
Target
200–600 mg
Form
Not listed
Magnesium
100%Dose
333 mg
Target
100–400 mg
Form
Not listed
Zinc
100%Dose
25 mg
Target
15–30 mg
Form
Budget
Other Ingredients (7)
Rice Bran OilCarrier
An oil pressed from rice bran, used as a carrier and emollient
BeeswaxCoating
Natural wax produced by honeybees, used as a coating and binding agent in softgels and tablets
GelatinCapsule
Protein derived from collagen, used in traditional capsule shells
GlycerinHumectant
Sweet-tasting liquid used in soft capsules and liquids
Sunflower LecithinEmulsifier
Non-GMO, non-allergenic emulsifier derived from sunflower seeds
Purified WaterSolvent
Water meeting USP specifications used as solvent/vehicle in gummies and liquids
Zinc OxideMineral
Common zinc form used for mineral fortification in supplements and protein powders
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
On the label
Suggested usage: Take 2 softgels daily with food.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$11.02
Cheaper than 80% 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.