Vitamin D3 + K2 – 90 servings

Trust should be verifiable. Every batch we produce is tested by an independent laboratory, and the certificate of analysis for your exact lot is published on this page — potency, heavy metals, microbials. Testing begins the moment a raw material arrives, continues through production, and no batch is released until every result clears. The label is a claim. The COA is the proof.

We formulate from peer-reviewed clinical research and dose to match it. We select the highest-grade material available for each ingredient, in the form the body absorbs best, and where a patented or branded form is the one that has actually been studied, that is the one we use. Every active appears at its exact amount, with no proprietary blends and nothing added that doesn't need to be there.

In our own cGMP-certified facility in California's Central Valley. Manufacturing in-house means quality is our responsibility at every step rather than a supplier's promise. Raw materials are purchased through established US suppliers who import and qualify them, and every material is tested against our own specification before it enters production — wherever it originated.

Because of what goes in. We buy the highest grade of each raw material, in the most absorbable form, and we work with the branded and patented ingredient houses whose material the clinical research was actually run on — names like Lonza, Albion, RIBUS, Sabinsa and Indena. Wherever possible those materials are made domestically. Our capsules are titanium-dioxide free. Then it is made in our own facility and third-party tested batch by batch. Every one of those choices costs more than the alternative, and the price reflects it. Anyone can claim quality — we publish ours.

It is a premium branded vitamin K2, and we chose it because with K2 the quality of the ingredient counts as much as the amount. It is made to a tighter standard than commodity K2, and every lot we run is tested and published so you can check it yourself.

Because it is a generous amount rather than the minimum that lets a label mention K2 at all. It sits in the range used in the research on bone and heart health, and comfortably inside established safety limits.

It is above the 4,000 IU tolerable upper intake level, which is worth knowing rather than glossing over. It is a widely used maintenance dose and the level most commonly studied for correcting low status, but if you already take D3 in a multivitamin, or you have not had your level tested, that is a conversation to have with a clinician first.

D3 raises how much calcium you absorb. K2 activates the proteins that decide where that calcium is deposited. Taking the first without the second raises the supply without directing it, which is the whole argument for pairing them.

Yes, properly. Both are fat-soluble and a meal containing some fat meaningfully improves how much you absorb. This is not a soft suggestion the way it is on a water-soluble vitamin.

Not without medical supervision. Vitamin K is a cofactor for several clotting factors, so it interacts directly with warfarin and other anticoagulants. This is a genuine interaction, not a precautionary label, so speak to whoever manages your medication first.