Andrew Huberman· PhD
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.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
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.
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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.
And in doing so, it's also making its own hormones. This, I think, is one of the most elegant aspects of the ovulatory menstrual cycle that, in a few minutes, you'll learn about something which still to this day, even though I've known about this stuff for decades now because of my training, still just blows my mind that you have one hormone, follicle-stimulating hormone, triggering the maturation of some eggs inside of some follicles and then those follicles themselves making another hormone that furthers the process and then soon, as you'll learn, create a hormone to trigger the second half of the process.