A water-soluble vitamin is a vital nutrient that dissolves in water and is easily excreted from the body. These vitamins include vitamin B complex, vitamin C, and folic acid. They are necessary for bodily functions like the formation of red blood cells, DNA synthesis, and nerve function. A few popular synonyms for water-soluble vitamin are hydrophilic vitamins, water-miscible vitamins, and soluble vitamins. Hydrophilic means "water-loving," and that is why this term is used for water-soluble vitamins, which are easily dissolved in water. Soluble vitamins are another synonym, as they dissolve in water and are not stored in the body.