This bone-support formula pairs **Calcium** and **Magnesium** with a small dose of **Vitamin D3** to help your body actually use the calcium you're taking. At 1,000mg, calcium is generously dosed — but absorption drops sharply above 500mg in a single sitting, so you'll get more from splitting your five daily tablets across two meals rather than taking them all at once.
**Magnesium** at 500mg covers the full supplemental range for energy, muscle, and nerve support, and it doubles as a co-activator for vitamin D in your body. The calcium comes as citrate, a well-absorbed form you can take with or without food. The magnesium, however, is a mix of citrate and oxide — and the oxide portion absorbs poorly (around 4%), meaning you're not getting the full 500mg worth of benefit.
The weak link is **Vitamin D3** at just 400 IU — only 40% of the minimum clinical dose of 1,000 IU. Since vitamin D is the ingredient that makes calcium absorption possible, this is a meaningful gap. If you're relying on this product for bone health, you'd likely want a separate vitamin D supplement at 1,000-2,000 IU to get the full benefit from the calcium and magnesium here.
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What it does
A combination of 3 label ingredients.
Magnesium
Mixed formsGrade —
Supports normal muscle and nerve function and helps the body produce energy.
Vitamin D
vitamin d3Premium
Cholecalciferol (vitamin d3): Supports normal bones; D3 generally raises vitamin D blood levels more than comparable D2 doses.
Ingredients (3)
Other ingredients
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
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
GlycerinHumectant
Sweet-tasting liquid used in soft capsules and liquids
Lab testing
How to take it
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
Suggested Use: As a dietary supplement for adults, take five (5) tablets daily, preferably with a meal. May be distributed throughout the day, or as directed by a healthcare practitioner.
Price check
$14.24
Near the median of 552 vitamin D 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.
Not medical advice. Consult your healthcare professional.