Gonadotropic hormones are hormones that influence the activity of the reproductive glands, also known as the gonads. These hormones are produced in the anterior pituitary gland, which is a gland located in the brain. The main gonadotropic hormones include:

1. Follicle stimulating hormone (FSH): FSH affects the growth and development of ovarian follicles in women and the production of sperm in men.
2. Luteinizing hormone (LH): LH is responsible for ovulation in women, i.e. the release of an egg from the ovary. In men, it stimulates the production of testosterone in the Leydig cells of the testes.

These hormones are important for the reproductive system and the regulation of hormonal balance in the body. Their production is controlled by a complex feedback system between the hypothalamus, pituitary and gonads.