When you asked last year I came up with 18: pregnenolone, DHEA, progesterone, kisspeptin, GnRH, LH, FSH, estradiol, prolactin, DHT, hepcidin, androstenedione, androstenediol, cortisol, TSH, T3, T4, rT3...
To this we might be able to add dynorphin, neurokinin B, GnIH, ACTH, aldosterone and...