Growth hormone is released from the pituitary gland, which receives signals from the hypothalamus.

“growth hormone is a hormone that we naturally make it's secreted from a gland called the pituitary gland the pituitary sits near the roof of the mouth and it extends out of the stock of the brain such that it can release hormones into the general bloodstream the pituitary is connected to the brain however so it can get input from a brain area called the hypothalamus and within the hypothalamus there are neurons that can send signals to the pituitary telling it to either release growth hormone or to suppress the release of growth hormone”