What is the recommended dietary allowance (RDA) for Vitamin K in adults?

The recommended dietary allowance (RDA) for Vitamin K in adults is established to ensure adequate levels for proper physiological functions, primarily for blood clotting and bone health. The correct range of 90-120 micrograms of Vitamin K acknowledges the varying needs based on factors like age and sex.

Vitamin K exists in several forms, including K1 (phylloquinone) found in green leafy vegetables and K2 (menaquinone) found in fermented foods. The RDA aims to cover the dietary intake necessary for adults to maintain optimal health, particularly in preventing deficiencies that could lead to bleeding disorders or weakened bones.

In setting these guidelines, nutritionists consider the average intake levels that can promote these health benefits without causing toxicity, as Vitamin K is generally safe with a high threshold for intake. Therefore, this range aligns with scientific research indicating that 90-120 micrograms is adequate for most adults.