Growth hormone is sometimes described as master hormone due to the effect it produces on several other hormones and processes in the body. (hgh10.com)
If we're talking about how to check testosterone levels, there's really only one answer — have a medical provider check them (along with several other hormones). (tctmed.com)
The pituitary gland's production of several other hormones is also dependent to a degree on sunlight entering the eye. (thepsoriasisprogram.com)