I tested seven sleep patches from three top brands, but only a few lived up to the hype. Here's everything you need to know ...

The researchers wanted to better understand how hormones affect skin aging, so they focused on insulin-like growth factor-1, growth hormone, estrogen, retinoids and melatonin. Melatonin stood out ...

Bright afternoon and early evening light exposure in adolescents leads to lower melatonin levels and delays circadian rhythms ...

A Harvard- and Stanford-trained gastroenterologist shares in a video how incorporating these drinks into your diet can ...

Melatonin is a hormone made by the pineal gland; it helps control our circadian rhythm, changes in body temperature, and functions like alertness and sleep, says Muhammad A. Rishi, MD, MBBS, a ...

Our beauty and skin-care writer spoke to top dermatologists about the best skin-care routine for your 30s, from cleansers to toners to retinol. You can build your whole routine for under $150.