Calcium,

D3 increases intestinal calcium absorption — but without adequate K2, that extra calcium can deposit in soft tissue and arterial walls. K2 activates the proteins that direct calcium into bone and keep it out of the vasculature. Taking D3 without K2 can be counterproductive for long-term cardiovascular health.

5,000 IU is a common functional-medicine daily dose and generally well-tolerated. If you have a known vitamin D deficiency or insufficiency, it's used for repletion; if your 25(OH)D is already in the optimal range, a lower dose may suffice. Test serum levels every 6–12 months with your practitioner.

Vitamin D3, K1, and K2 are fat-soluble — they absorb meaningfully better when delivered in a fat matrix. The olive oil liquid capsule provides that matrix at the point of ingestion, unlike dry-powder D3 products that rely on whatever fat is in your meal.

Vitamin K can interact with warfarin (Coumadin) by supporting clotting-factor synthesis. If you are on warfarin or another vitamin K-dependent anticoagulant, consult your healthcare provider before starting. Many patients on these medications require specific INR monitoring if they add K-containing supplements.

Boron citrate extends the circulating half-life of vitamin D and supports its conversion into the active 1,25-dihydroxyvitamin D form. It also plays a role in bone matrix density and hormone metabolism — a small but meaningful addition to the D3/K stack.

Adults focused on bone density, cardiovascular calcium handling, immune resilience, or mood stability. Particularly useful for patients with limited sun exposure, darker skin tones, osteoporosis risk, or VDR-related genetic variants that affect vitamin D utilization.