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But taking too much can be dangerous, health experts say. Vitamin K2 is lauded for a number of important health benefits. But taking too much can be dangerous, health experts say.
The number n of isoprenyl units in their side chain differs and ranges from 4 to 13, hence vitamin K 2 consists of various forms. [2] It is indicated as a suffix (-n), e. g. MK-7 or MK-9. The most common in the human diet is the short-chain, water-soluble menatetrenone (MK-4), which is usually produced by tissue and/or bacterial conversion of ...
Although in the U.S. the adult UL is set at 4,000 IU/day, over-the-counter products are available at 5,000, 10,000 and even 50,000 IU (the last with directions to take once a week). The percentage of the U.S. population taking over 4,000 IU/day has increased since 1999. [40]
Vitamin K has no upper limit, as human data for adverse effects from high doses are not sufficient. [5] In the European Union, adequate intake is defined the same way as in the US. For women and men over age 18 the adequate intake is set at 70 μg/day, for pregnancy 70 μg/day, and for lactation 70 μg/day.
Both vitamin D2 and D3 are good, but “D3 has better bioavailablilty,” says Dr. Manson, meaning that it’s more easily used by your body. But that doesn’t mean any old brand will do.
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