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.