Randomized study confirms the effectiveness of vitamin K2 in reducing frequency, duration, and intensity of nocturnal cramps
Nocturnal leg cramps (NLCs) are a common condition, affecting up to 60% of adults at least once in their lifetime. In older individuals, these cramps can become frequent, painful, and interfere with restful sleep.
To date, there are no universally approved treatments that are both effective and safe. This has led researchers to explore new options, including vitamin K2, already known for its beneficial effects on cardiovascular and bone health.
The Clinical Trial on Vitamin K2 and Nocturnal Cramps
A multicenter, double-blind, placebo-controlled study published in JAMA Internal Medicine in December 2024 evaluated the effectiveness of vitamin K2 in managing nocturnal leg cramps in individuals aged 65 and older.
The trial was conducted in China between September 2022 and December 2023 and included 199 participants.
Objectives and Methodology of the Study
The main goal was to determine whether daily supplementation with vitamin K2 (menaquinone-7, 180 μg) could significantly reduce the weekly frequency of cramps compared to a placebo.
Only individuals with at least two nocturnal cramp episodes in the previous two weeks were included. Those taking diuretics, vitamin K antagonists, or who had medical conditions that could interfere with results (e.g., hypoglycemia, neuropathies, neurodegenerative diseases) were excluded.
Participants were randomly assigned to two groups: one received vitamin K2, and the other a placebo, for eight weeks. Data on cramp frequency, duration, intensity, and potential side effects were collected weekly via phone calls by researchers.
Main Results of the Clinical Study
Participants in the vitamin K2 group experienced a mean weekly reduction in cramps from 2.6 to 0.96 episodes. In contrast, the placebo group showed an increase from 2.7 to 3.63 episodes. The difference between the two groups was statistically significant (−2.67; P < .001).
In addition to frequency, the average cramp duration dropped by 0.90 minutes in the vitamin K2 group versus 0.32 minutes in the placebo group. The pain intensity also decreased by 2.55 points on a 1–10 scale in the treated group, compared to 1.24 in the control group.
Safety of Vitamin K2 in the Elderly
No side effects related to vitamin K2 were reported during the study. This supports previous research indicating that vitamin K2 is safe, even for older adults, provided they are not on anticoagulant therapy such as warfarin, which can interact negatively with the vitamin.
Interpretation of Results and Clinical Implications
One of the most notable findings is that the benefits of vitamin K2 were observed as early as the first week of treatment, suggesting a fast and sustained effect.
Although the exact mechanism is not fully understood, it is hypothesized that vitamin K2 may help reduce calcium influx into muscle cells, thereby modulating muscle contraction similarly to calcium channel blockers—but without their side effects.
This clinical trial offers statistically significant evidence that vitamin K2 may be an effective, safe, and accessible treatment for nocturnal leg cramps in older adults.
Given its demonstrated ability to reduce the frequency, intensity, and duration of cramps with no observed side effects, vitamin K2 could serve as a natural alternative to traditional pharmacological therapies.
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Source: December 2024, “Vitamin K2 in Managing Nocturnal Leg Cramps: A Randomized Clinical Trial,” PubMed
