Vitamin C or ascorbic acid AsA is a naturally occurring organic compound with antioxidant properties, found in both animals and plants. It functions as a redox buffer which can reduce, and thereby neutralize, reactive oxygen species. It is a cofactor for enzymes involved in regulating photosynthesis, hormone biosynthesis, and regenerating other antioxidants; which also regulates cell division and growth, is involved in signal transduction, and has roles in several physiological processes, such as immune stimulation, synthesis of collagen, hormones, neurotransmitters, and iron absorption, has also roles in detoxifying the body of heavy metals. Severe deficiency of vitamin C causes scurvy, whereas limited vitamin C intake causes symptoms, such as increased susceptibility to infections, loosening of teeth, dryness of the mouth and eyes, loss of hair, dry itchy skin, fatigue, and insomnia. In contrast, vitamin C can also act as a prooxidant, especially in the presence of transition metals, such as iron and copper, starting different hazardous radical reactions.
Phytomenadione , also known as vitamin K 1 or phylloquinone , is a vitamin found in food and used as a dietary supplement. Common side effects when given by injection include pain at the site of injection and altered taste. Phytomenadione was first isolated in Phytomenadione is often also called phylloquinone, vitamin K,  or phytonadione. Sometimes a distinction is made between phylloquinone, which is considered to be a natural substance, and phytonadione, which is considered to be a synthetic substance. A stereoisomer of phylloquinone is called vitamin k 1 note the difference in capitalization. Vitamin K is a fat-soluble vitamin that is stable in air and moisture but decomposes in sunlight.