The Leydig cells as found in the human body are the secretory source of

Interstitial cells or cells of Leydig are present in the connective tissue lying in between seminiferous tubules. These cells secrete oestradiol-steroid androgens, e.g., testosterone. Androgens stimulate male characters, influence male sex and behaviour (libido) and regulate the development, maturation and functions of male accessory sex organs.