High Cortisol Levels – Symptoms and Ways to Lower It
Tomasz Jankowski
2026-03-23
6 min. read
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The hormone responsible for stress, commonly referred to as cortisol, is often cited as the cause of many malfunctions in the body. Can supplementation be beneficial in this case? How can one effectively lower an increased cortisol level? What symptoms indicate an excessive cortisol level?
Cortisol: Definition, site of synthesis, and regulatory mechanisms governing its secretion in the human body
Cortisol is a glucocorticoid steroid hormone whose biosynthesis relies on the metabolic conversion of cholesterol. This process is initiated by neuroendocrine signals originating in the hypothalamus, though the ultimate production and release of cortisol occur within the *zona fasciculata* of the adrenal cortex. The sequence of events involves:
– the secretion of corticotropin-releasing hormone (CRH) in the hypothalamus;
– the stimulation by CRH of corticotropic cells located in the anterior pituitary gland, leading to the release of adrenocorticotropic hormone (ACTH);
– the binding of ACTH to specific receptors in the adrenal cortex, which triggers cortisol synthesis and its subsequent secretion into the bloodstream.
Cortisol levels exhibit a pronounced circadian rhythm: peak concentrations (approximately 16 micrograms per deciliter) are observed in the early morning (between 7:00 and 8:00 AM), whereas by the late afternoon (after 4:00 PM), levels typically decline to around 4 µg/dL. This fluctuation reflects the physiological regulation of the hypothalamic-pituitary-adrenal (*HPA*) axis.
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