NutriStack
Alendronate and Vitamin K2, a synergy.
Alendronate plus vitamin K2 produces greater suppression of undercarboxylated osteocalcin and modestly better bone outcomes than alendronate alone in postmenopausal osteoporosis. The two drugs work on complementary pathways (resorption versus matrix carboxylation), so the combination is biologically additive.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Alendronate 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. Alendronate plus vitamin K2 produces greater suppression of undercarboxylated osteocalcin and modestly better bone outcomes than alendronate alone in postmenopausal osteoporosis. The two drugs work on complementary pathways (resorption versus matrix carboxylation), so the combination is biologically additive.
Mechanism. Alendronate inhibits farnesyl pyrophosphate synthase in osteoclasts, blocking bone resorption. Vitamin K2 is a cofactor for gamma-glutamyl carboxylase, which activates osteocalcin to bind calcium into the bone matrix. The two pathways converge on improved net bone mineralization.
Recommendation. If your prescriber agrees, vitamin K2 (MK-7 or MK-4) can be taken alongside alendronate for added benefit. Take the K2 with a meal containing fat, separate from the morning alendronate dose by at least 30 minutes. Discuss with your clinician if you also take warfarin (where K2 is contraindicated).
Minimum separation. 30
Sources (2)
- 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
- Iwamoto J. Vitamin K2 therapy for postmenopausal osteoporosis. Nutrients. 2014;6(5):1971-80. PMID 24841104
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alendronate 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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