For bone strength and immune support, this pairs two nutrients that work better together. **Vitamin D3** at 5,000 IU sits right at the top of the clinical range (1,000–5,000 IU), and it's in the preferred cholecalciferol form — so your body can use it efficiently to support calcium absorption and immune function.

**Vitamin K2** at 90mcg as MK-7 falls within the studied range (90–200mcg). K2's job is directing calcium into your bones and teeth instead of your arteries, which is especially important when you're supplementing higher-dose D3. The MK-7 form has a long half-life, so once-daily dosing works well.

The K2 dose is on the lower end of the clinical range. If you're specifically targeting bone density, you may want closer to 120–200mcg. But as a daily maintenance combo for D3 and K2 together, the doses here are solid.