Question explored with the scientific record
Conversation so far
- 1 Side effects of proton pump inhibitors
- 2 Side effects of reducing stomach acid
- 3 Any risk Taking calcium tablets
- 4 Does vitamin K reduce risks from Taking calcium tablets
Answered on this page ↓
Does vitamin K reduce risks from Taking calcium tablets
The short version: vitamin K may blunt the kidney-stone side of calcium, but only animal and lab data exist, and nothing here shows it protects the heart.
The one direct test is in rats. Vitamin K1 cut kidney crystal formation in rats fed a stone-forming chemical, significant at week 4 and again at weeks 6 and 8 [2]. In human kidney cells, vitamin K1 reversed warfarin-driven crystal sticking and cell death, and blocking a vitamin K-dependent protein (matrix Gla protein) erased the benefit [2]. That is a real mechanism. It is not a human outcome trial.
The heart question is where vitamin K gets oversold. One review names vitamin K status as a modifier of phosphate-driven calcification in kidney disease [1], but that is a narrative review, not a trial of vitamin K supplements against heart attacks. Nothing in these records tested vitamin K plus calcium against calcium alone for stones or heart events in people.
| What was tested | Model | Result |
|---|---|---|
| Vitamin K1 vs none, crystal formation | Rats | Fewer crystals at weeks 4, 6, 8 [2] |
| Vitamin K1 vs warfarin, crystal adhesion | Human kidney cells | Reversed harm [2] |
| Vitamin K status and calcification | Review, kidney disease | Named as modifier [1] |
| Vitamin K + calcium, human outcomes | Not tested here | No data |
My call: vitamin K is plausible and low-risk as a partner to calcium, but the human evidence for fewer stones or fewer heart events does not exist in what I can see. Confidence: low.
Sources used 2
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Modifying Phosphate Toxicity in Chronic Kidney Disease
Phosphate toxicity in CKD is mediated by calciprotein particles and FGF23 and modified by magnesium, calcium, α-klotho, vitamin K status, zinc, and pH, suggesting targets beyond phosphate lowering.
DOI: 10.3390/toxins11090522 -
Vitamin K1 Inhibition of Renal Crystal Formation through Matrix Gla Protein in the Kidney
Vitamin K1 reduced renal crystal formation in ethylene glycol-fed rats, and in HK2 cells it reversed warfarin-induced crystal adhesion, apoptosis and injury, acting through matrix Gla protein.
DOI: 10.1159/000503300