Luteinizing hormone (LH)
LH is the hormone whose mid-cycle surge triggers ovulation, the release of a mature egg.
Ovulation predictor kits detect this LH surge in urine to estimate your most fertile days.
After ovulation, the ruptured follicle becomes the corpus luteum, which produces progesterone.
Sync your whole cycle, automatically
PhaseBloom builds your meals, workouts, and skincare around your exact cycle phase, day by day.