Gonal-F is used to stimulate the growth of eggs and sperm and to treat primary ovarian failure in women. It is effective in promoting ovulation and enhancing fertility. For men with hypogonadism, this hormone helps stimulate sperm production. In addition, Gonal-F can encourage the ovaries to produce multiple eggs, which can then be harvested for use in gamete intrafallopian transfer (GIFT) or in vitro fertilization (IVF).