This category of vitamin assays lists tests that define and quantitate levels of vitamins in the human body.
Water soluble vitamins and fat soluble vitamins are nutrients your body needs in your diet for you to stay healthy. For optimal health, it is important to get the vitamins and minerals your body needs–either through a balanced, nutritious diet, health supplements, or both. Your body requires two kinds of vitamins: fat soluble vitamins (A, D, E and K) and water soluble vitamins (B-complex and C).
Water soluble vitamins, which are highly soluble, require daily replenishment in your body. Fat soluble vitamins, which are also essential for your health and stored in your liver, do not need to be replaced every day.