Sunlight activates hormones essential for mood, sleep and reproductive health — that’s why it’s important to go outside when ...

Once again I am extremely lucky to have this article co-written by a senior graduate student who's an expert on how reproductive hormones act on the brain. Stephanie Koebele is completing her Ph.D.

Male hormone levels maintain day-to-day stability while female hormones experience continuous changes throughout both the menstrual cycle and various life stages.

The human body runs on chemistry—from the water that regulates temperature to the proteins that carry oxygen and signal cells.