ECONOMIC INVESTIGATOR(EO) -2019 Vitamins are broadly classified into two categories based on their solubility: 1. Fat-soluble vitamins A, D, E, K. They are absorbed along with fats in the diet and can be stored in the body's fatty tissues and liver. 2. Water-soluble vitamins B complex vitamins (B1, B2, B3, B5, B6, B7, B9, B12) and Vitamin C. They are not stored in the body in significant amounts and are excreted in urine, requiring regular intake.