Vitamin K can be divided into vitamins K1, K2, K3, K4 and K5 (1):
A pilot trial demonstrated that vitamin K2 supplementation could decrease the frequency, duration, and severity of muscle cramps in haemodialysis patients (2).
A randomized clinical trial involving 199 participants 65 years and older with nocturnal leg cramps, those who received vitamin K2 experienced a significant reduction in the mean frequency of cramps per week compared with the placebo group (3).
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