Calcium and Vitamin K2
Supplement–drug interaction evidence from the TruthStack database.
| Severity | HIGH |
|---|---|
| Evidence Tier | Moderate |
| Interaction Type | SYNERGISTIC CRITICAL |
| Mechanism | physiological |
| Last Reviewed | 2026-02-07 |
Summary
Always include K2 when supplementing calcium, especially with vitamin D
API Reference
GET https://api.truthstack.co/v1/check?c1=calcium&c2=vitamin_k2
Open, unauthenticated. Returns JSON. Developer documentation
Related Interactions
What this page is and is not. TruthStack is an informational reference database that describes published pharmacological findings. It does not provide medical advice, diagnosis, or treatment recommendations. The information on this page reflects flags in our database and should not replace consultation with a qualified healthcare provider. Always discuss supplement-drug combinations with your prescriber or pharmacist.