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Vitamins are organic compounds required for normal metabolic reactions within the body. They are divided into two broad categories:
:'''Fat-soluble''' vitamins: [[Vitamin A (Retinol) - Nutrition|A]], [[Vitamin D (Cholecalciferol) - Nutrition|D]], [[Vitamin E (Alpha Tocopherol) - Nutrition|E]], and [[Vitamin K (Menaquinone-7, MK-7) - Nutrition|K]]
:'''Water-soluble''' vitamins: [[Vitamin B1 (Thiamin) - Nutrition|B1 (thiamin)]], [[Vitamin B2 (Riboflavin) - Nutrition|B2 (riboflavin)]], [[Vitamin B3 (Niacin) - Nutrition|B3 (niacin)]], [[Vitamin B4 (Choline) - Nutrition|B4 (choline)]], [[Vitamin B5 (Pantothenic Acid) - Nutrition|B5 (pantothenic acid)]], [[Vitamin B6 (Pyridoxine) - Nutrition|B6 (pyridoxine)]], [[Vitamin B9 (Folic Acid) - Nutrition|B9 (folic acid)]] and [[Vitamin B12 (Cobalamin) - Nutrition|B12 (cobalamin)]]
Adult animals are able to store fat soluble vitamins in adipose tissue and the [[Liver - Anatomy & Physiology|liver]], and can mobilise these to meet whole body needs in response to dietary deficiencies; because of this it may take weeks to months to develop clinical signs of a fat-soluble vitamin deficiency. Young growing animals have limited stores and reserves of the fat soluble vitamins, and are consequently less able to cope with even relatively short term deficiencies.
The water-soluble vitamins cannot be stored by dogs or cats, and a dietary deficiency of these vitamins can result in clinical signs of disease within days to weeks.
==References==
National Research Council (NRC). (2006) '''Vitamins. In Nutrient Requirements for Dogs and Cats.''' 2006'' Washington, DC: National Academies Press'' p.193-245.