Your body gets vitamin A from food sources such as liver, carrots, butter, egg, milk, and many more. In these foods there are the many forms of vitamin A. Some forms include Retinol, alpha-carotene, beta-carotene, as well as 2 or 3 more carotenes. Your body does not make vitamin A; it absorbs it.
Beta-carotene
Beta-carotene
Vitamin c
There are many foods that can be converted into vitamin A. These include carrots, leafy greens, as well as some vegetable oils.
precursors
Betacarotene
No actually, Vitamin C is one of the "Water-Soluble" vitamins, this means that it does not get deposited as fat in the body rather it remains soluble and is passed out of the human body in the form of faeces.
Carrots are rich in beta-carotene, which is converted into vitamin A in the body. They also contain fiber, vitamin K1, potassium, and antioxidants like lutein and zeaxanthin.
Vitamin K is converted to active vitamin K in the body which helps to activate clotting factors in the liver. Coumadin (warfarin) prevents the body from activating vitamin K, therefore the clotting factors are never activated and your blood becomes thinner or more difficult to clot. When you eat vitamin K rich foods (green leafy vegitables, etc), the vitamin K competes with the Coumadin and can neutralize its effect.
vitamin D
retina
Vitamin B3, also known as niacin, can be synthesized in the body from the essential amino acid tryptophan. Tryptophan is converted into niacin through several metabolic pathways.