HGH, or Human Growth Hormone, is a substance that is naturally secreted from the pituitary gland of the human body. It plays a vital role in the proper functioning of the brain, body and the sex organs. It is one of the numerous hormones of the endocrine gland that is naturally produced by the body. Best HGH supplements for women, for example, similar to estrogen, DHEA, melatonin and testosterone, go beyond the simple purpose of preventing the ageing process. It can also assist in reversing the signs related with aging and disorders associated with increasing age.