**Vitamin D3** at 1,000 IU per serving — the floor of the clinical range, enough to maintain adequate levels if you're not deficient. The liquid format with MCT oil aids absorption since both vitamins are fat-soluble, and the flexible dosing (2 drops up to three times daily) lets you scale to 3,000 IU if your levels need more support.

**Vitamin K2** is dosed at 200 mcg, right at the top of the studied range for directing calcium into bones instead of arteries. The D3 + K2 pairing is well-supported — D3 increases calcium absorption while K2 ensures it goes where you want it. Together they cover bone density, immune function, and cardiovascular protection.

The K2 form here is MK-4, which clears your body in just a few hours compared to roughly four days for MK-7. If you're taking one serving daily, the K2 benefit may not last through the full day — splitting your dose across morning and evening would help.