Antidiuretic hormone

Antidiuretic hormone (ADH) or vasopressin, also known as arginine vasopressin (AVP), or argipressin is a hormone that causes the kidneys to reabsorb water and return it to the circulation, thus controling the concentration of urine.

Function
ADH is created by the supraoptic nuclei, then travels to the posterior pituitary for storage. Hypothalamic neurons them signal the posterior pituitary to release ADH. At very high concentrations, ADH can constrict blood vessels, which increases blood pressure.

ME/CFS
According to Dr. David Kaufman, formerly of the Open Medicine Institute, potential diagnostic biomarkers for ME/CFS include low natural killer cell function, low antidiuretic hormone levels, mutations of the MTHFR gene, and abnormalities of the hypothalamic-pituitary-adrenal axis (HPA).

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 * 37.5 Endocrine Glands - OpenStax Biology 2e