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Numerous clinical trials confirm that vitamin K plays a vital role in maintaining healthy bone structure, as it facilitates the transport of calcium from the blood to the bones. Vitamin K is also essential for the regulation of calcium-dependent proteins in the arteries. Vitamin K2 is found in meat, eggs, and dairy products, and is also made by some friendly microbes in the gut. Studies have shown that vitamin K2 has up to ten times greater bioavailability than K1. For example, K1 is cleared by the liver within eight hours, while measurable levels of K2 can be found up to 72 hours after ingestion. Recent research has shown that the MK-4 and MK-7 forms of vitamin K2 are the most active and readily absorbable by the body. MK-7 has a longer residence time in our body, while MK-4 provides an immediate increase in vitamin K levels in the blood. Vitamin K1 found in vegetables is essential for the body, but even more important is the provision of these two types of K2. Life Extension's Super K formula provides the necessary amount of vitamin K1 and the MK-4 and MK-7 types of vitamin K2 with just one capsule daily. The advantage of this formula is that it provides the exact amount of MK-7 that our body can utilize, so that it is sufficient for 24 hours.