Cortisol is a steroid hormone produced in your adrenal glands. It can affect your body in a number of ways, including how your body responds to stress. When balanced, your cortisol levels will fluctuate throughout the day, starting higher in the morning, and getting lower in the evening. If your cortisol levels are too low in the morning or too high in the evening, it can have a negative impact on everything from your energy levels to your immune health. Looking at your cortisol levels at just one point during the day will not provide the full picture, which is why we've created a simple but comprehensive test that looks at your levels throughout the day. Please be sure to collect and return your sample within 14 days of receipt of your lab test. All lab tests expire within 6 months of purchase EquiLife has temporarily suspended lab sales into the State of Washington through August 31, 2025