Vitamin K1, also known as phylloquinone, phytomenadione, or phytonadione, is a polycyclic aromatic ketone, based on 2-methyl-1, 4-naphthoquinone, with a 3-phytyl substituent. It is a fat-soluble vitamin that is stable to air and moisture but decomposes in sunlight. It is found naturally in a ... Read more