NutriStack
Risedronate and Vitamin K2, a synergy.
Vitamin K2 complements bisphosphonate therapy by activating osteocalcin, the matrix protein that binds calcium into bone. Combining vitamin K2 with a bisphosphonate has been shown to further lower undercarboxylated osteocalcin and support bone quality beyond what the bisphosphonate alone achieves.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Substances
- Risedronate and Vitamin K2
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Vitamin K2 complements bisphosphonate therapy by activating osteocalcin, the matrix protein that binds calcium into bone. Combining vitamin K2 with a bisphosphonate has been shown to further lower undercarboxylated osteocalcin and support bone quality beyond what the bisphosphonate alone achieves.
Mechanism. Risedronate inhibits osteoclast resorption via FPPS inhibition. Vitamin K2 acts as a cofactor for gamma-glutamyl carboxylase, activating osteocalcin (matrix protein) and MGP (vascular protector). The two pathways converge on improved bone quality.
Recommendation. If your clinician approves, vitamin K2 (MK-7 90-180 mcg or MK-4) can be co-supplemented with risedronate. Take K2 with a meal containing fat, separate from the morning risedronate dose by at least 60 minutes. Avoid this combination if you also take warfarin.
Minimum separation. 60
Sources (2)
- Iwamoto J. Vitamin K2 therapy for postmenopausal osteoporosis. Nutrients. 2014;6(5):1971-80. PMID 24841104
- Hirao M, Hashimoto J, Ando W, Ono T, Yoshikawa H. Response of serum carboxylated and undercarboxylated osteocalcin to alendronate monotherapy and combined therapy with vitamin K2 in postmenopausal women. J Bone Miner Metab. 2008;26(3):260-4. PMID 18470667
Stack Score
How this pair moves the number.
Effect on the composite score
If both Risedronate and Vitamin K2 are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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