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The question is whether nutritional doses, which I would define as those under one milligram per day, offer meaningful support to bone health.

Observational studies have associated the use of vitamin K antagonists as anticoagulants with lower bone mineral density (/d) or borderline nutritional (1.5 mg/d) doses of vitamin K that suggest improvements in bone health, but they are not consistently convincing.

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Finally, it provides reviews of the available supplements and a searchable database of the vitamin K or have a strong science background, you can click on the buttons that say “click here for a more detailed explanation” in order to expand descriptions that are better suited to your level of expertise.

These roles are shown in the shareable infographic below.

These include the following: Gla-rich protein, which accumulates in soft tissues during pathological calcification; periostin, which may be necessary for growth; Gas6, which promotes cell survival, and, along with protein S, helps clear away the debris of dead cells (for example, in atherosclerosis, where accumulating debris of dying cells causes a dangerous inflammatory state); and a family of four transmembrane Gla-rich proteins may act as cell surface receptors.

Vitamin K also supports the production of important sulfur-based lipids known as sulfatides in the brain, and accumulates in the mitochondrion where it may play a direct role in the electron transport chain, as it has been shown to do in fruit flies ().

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Carboxyl groups carry negative charges, so carboxylation helps vitamin K-dependent proteins bind to calcium, which carries a positive charge.

In other words, the most well-established role of vitamin K is to add carbon dioxide to proteins and thereby give them the ability to bind calcium.

Estimates of bone strength improved, and less shrinkage occurred in the height of the thoracic spine (mid-back).

Although the number of fractures was too small for statistical tests, six subjects in the placebo group but only one subject in the vitamin K group suffered vertebral fractures.

A study published in the 1950s, however, found that menadione prevented tooth decay in hamsters more effectively when injected into their abdominal cavities than when given orally ().

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