FSH triggers follicle maturation and hormone production in the follicular phase of the menstrual cycle.

“And the first 14 days of the menstrual/ovulatory cycle is referred to as the follicular phase because of this relationship between FSH triggering the maturation of a subset of follicles.”

“But the first half of that cycle is the so-called follicular phase, FSH, has triggered the departure of a subset of these follicles that contain immature eggs. And it is triggering the maturation of those eggs.”

“And it is triggering the maturation of those eggs. Luteinizing hormone is also present, but also at relatively low levels. And it's during the first half of this ovulatory menstrual cycle that the main goal is to get those follicles to mature. So inside of those follicles, the egg is developing. It's growing. It's maturing. And in doing so, it's also making its own hormones.”