Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Vitamin K is scientifically recognized for its essential role in blood clotting, as it is required for the synthesis of clotting factors in the liver. The logic behind using vitamin K for the prevention or treatment of bruises (contusions) is that a deficiency in vitamin K impairs the blood’s ability to clot properly, potentially leading to increased bruising. There is strong evidence that vitamin K supplementation or administration can help individuals with a documented deficiency, such as those with malabsorption syndromes or those taking certain anticoagulant medications (e.g., warfarin), to reduce their tendency to bruise easily.

For people with normal vitamin K levels, however, there is limited direct evidence supporting oral or topical vitamin K supplementation specifically for the prevention or treatment of everyday bruising. Some clinical studies have examined topical vitamin K preparations (such as creams or gels) for reducing the severity or duration of bruising, particularly after procedures like laser treatments, with mixed results. A few small studies have shown modest benefit, but overall, the evidence is inconclusive and insufficient to support widespread use for this indication in the general population.

In summary, while there is a clear scientific rationale and strong evidence for using vitamin K to prevent bruising in cases of deficiency, the evidence for benefit in individuals with normal levels is limited (rating: 2 out of 5). More robust clinical trials are needed to clarify its efficacy for this use.

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