Vitamin K1

Last update: 2.5.2017.

Vitamin K1

Supplement Watch - Vitamin K1

Other name(s) for Vitamin K1

Phylloquinone, phytomenadione, phytonadione

General information for Vitamin K1

Vitamin K1 is synthesized by plants. Highest amout of it is found in green leafy vegetables. This is due to production of the K1 being directly linked to photosynthesis. K1 performs the most well known functions of vitamin K, including the production of blood-clotting proteins.

Solubility of Vitamin K1


Take care when supplementing with fat soluble vitamins.

Benefits of Vitamin K1

Activates proteins and calcium essential to blood clottingMay help prevent hip fractures

Deficiency symptoms / disease

K1 deficiency symptoms include
bleeding of the gums or nose
Females can have heavy menstrual bleeding.

Overdose symptoms / disease

No known toxicity is associated with high doses of K1 or K1 forms of vitamin K. For this reason no tolerable upper intake level has been set however allergic reaction from supplementation is possible.

FDA information for Vitamin K1

(Daily value/Recommended dietary allowance/Adequate intake)

Recommended intakes of nutrients vary by age and gender and are known as Recommended Dietary Allowances (RDAs) and Adequate Intakes (AIs). However, one value for each nutrient, known as the Daily Value (DV), is selected for the labels of dietary supplements and foods. A DV is often, but not always, similar to one's RDA or AI for that nutrient. DVs were developed by the U.S. Food and Drug Administration (FDA) to help consumers determine the level of various nutrients in a standard serving of food in relation to their approximate requirement for it. The label actually provides the %DV so that you can see how much (what percentage) a serving of the product contributes to reaching the DV.

Data from U.S. Department of Health & Human Services, National Institutes of Health, Daily values.

Look at daily value in the main vitamin page.

Food sources for Vitamin K1

Look at food sources in the main vitamin page

Vitamin K1 is obtained from leafy greens and some other vegetables.

External links

Wikipedia-Phylloquinone MedlinePlus-Vitamin K