I already use calcium: what information do I need about D3 and K2?

A guide for those who use a calcium product and want to discuss D3 or K2: packaging, reasons for use, and questions to prepare.

The question starts with the product you use

If you are already taking calcium, start with the reason you introduced it: professional guidance, a self-chosen formula, or a combination product. This is a more useful starting point than the desire to complete a set of bottles.

Check if vitamin D is already present

Vitamin D contributes to calcium absorption. Some preparations combine multiple nutrients: read the ingredients before adding another product. The fact that calcium and D are paired in a formula does not prove that you should also introduce K2.

For K2 Biomed, identify the 50 ml drop bottle separately. Do not calculate its dosage based on the number of sprays of your calcium, and do not use the 150 ml or 500 ml mineral format as a measure for your intake.

Three questions to bring to your consultation

1. Why am I using this calcium product, and is the recommendation still current?
2. Does it already contain vitamin D or other nutrients I am taking elsewhere?
3. What specific need should adding K2 resolve?

Bring the packaging, any instructions received, and any tests already requested by a professional. There is no need to invent a new list of analyses to be able to ask these questions.

After the consultation

Note which products to keep, which instructions to follow, and when to re-evaluate the routine. If the decision is to purchase K2, go to the selection page. If only a doubt about the calcium you already own emerges, use the page for your specific format to identify the correct packaging.

Continue with the topic that interests you

• Inventory of packaging
• Choosing the Calcium format
• Finding your way with K2
• All Biomed Vitamin K2 guides
• Biomed Guide Center

Questions about this in-depth guide

Sources and further reading

• NIH — Vitamin D and calcium