This article was reviewed by Felix Gussone, MD. Key Takeaways: Your endocrine system regulates many bodily functions, from ...

When your body lacks vitamin D, it can disrupt several important functions, especially the bones, muscles and immune system.

Cortisol is the talk of the internet but doctors say most people don't need to worry about it. Levels of what is known as the stress hormone naturally rise and fall throughout the day.

Supplements including ginseng, vitamin C, L-theanine, and lemon balm may help reduce cortisol levels and boost mental health. Magnesium, probiotics, and prebiotics are also being studied for their ...