The cortisol-cycle loop nobody talks about.

Sleep debt does not just make you tired. It rewires the HPA axis — the same axis that regulates ovulation, insulin sensitivity, and the luteal phase.

In under-slept women, morning cortisol runs higher and evening cortisol fails to drop. That single pattern is enough to delay ovulation, blunt progesterone, and worsen the skin and mood symptoms most women blame on their cycle.

The intervention is unglamorous: two weeks of protecting the same 90-minute sleep window every night. Most women see cycle regularity return before they see anything else.

No supplement replaces sleep. Ours are formulated on the assumption that you are, at minimum, trying.