A part of your brain called the hypothalamus produces a substance called antidiuretic hormone (ADH). It is stored in the pituitary gland. ADH tells the kidneys to hold water, which, in turn, makes the urine more concentrated. Your ADH levels increase when you are thirsty or dehydrated slightly. After quenching your thirst, the ADH levels drop, which creates pale or diluted urine. ADH is also known as vasopressin.

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