Dr Ford Brewer - PrevMed Don't take Vitamin D3 & Vit K2 together - Ford Brewer MD MPH (PrevMed Health)
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Feb 5, 2026 A deep dive into how vitamin D3 and K2 act in the body and why their balance matters. Differences between MK4 and MK7 and which tissues they affect. How K2 activates MGP to guard arteries and its unexpected metabolic effects on GLP‑1 and insulin resistance. Dangers of mismatched combo supplements and a real-case of D3 toxicity. Practical dosing strategy and food sources of K2.
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Don't Use Combo D3+K2 Pills Blindly
- Avoid taking fixed-combination D3+K2 pills without checking doses.
- Test vitamin D3 blood levels and dose D3 based on results rather than label amounts.
Patient 'Arnold' Suffered From Hidden D3 Overdose
- Arnold took a combo D3+K2 pill and later developed rising blood calcium and declining kidney function.
- Stopping the combo, testing D3, and separating K2 fixed his calcium and kidney issues.
K2 Activates The Body's Calcium Traffic Cop
- K2 activates matrix GLA protein (MGP) which prevents calcium depositing in arteries.
- Without K2, MGP stays inactive and calcium can build up in wrong places.