Vitamin K 1

**Definition:** A family of phylloquinones that contains a ring of 2-methyl-1,4-naphthoquinone and an isoprenoid side chain. Members of this group of vitamin K 1 have only one double bond on the proximal isoprene unit. Rich sources of vitamin K 1 include green plants, algae, and photosynthetic bacteria. Vitamin K1 has antihemorrhagic and prothrombogenic activity.

**Tree numbers:** - D02.455.426.559.847.638.721.374.689 - D02.455.849.291.523.500.689 - D02.806.550.625 - D04.615.638.721.374.689

**Synonyms:** - Phytonadione - Phylloquinone - Phytomenadione - Vitamin K1