Supplement companies often claim peptides can amplify muscle gain and facilitate fat loss. But few studies have explored the impact of peptides on bodybuilding, and some are banned in professional ...

What Exactly Is Vitamin D? Despite its name, vitamin D isn't a vitamin—it's a hormone. Unlike traditional vitamins that we must obtain solely from food, our bodies can produce vitamin D naturally when ...

During sleep, the brain produces growth hormone to help build muscle and bone and reduce fat. UC Berkeley research in mice reveals the brain circuits that regulate growth hormone release, along with a ...