The newest, most accurate way
to predict your day and plan your life!
Teaching women and girls how hormones impact their moods, health and behavior all cycle long. Learn more.
NEW! 28 Days: What Your Cycle Reveals About Your Moods, Health & Potential—Updated & Expanded by Hormonology founder Gabrielle Lichterman
28 Daysis the book that launched the cycle-syncing and hormone awareness movement when it was first published in 2005. Now it’s back with an all-new updated and expanded edition. It’s the definitive guide to the hormones in your cycle! Learn more.
Gabrielle Lichterman is the founder of Hormonology and a nationally-known women’s health journalist. Learn more about her mission to spread hormone education to women and girls everywhere here.
Best-Selling Hormonology Apps – Hormone Horoscope Period Trackers
The first-and-only menstrual cycle tracker apps that show you how your hormones impact your moods, health and behavior every day of your cycle!
BONUS: Sign up today and I’ll send you my FREE “Hormonology Quickstart Guide to Syncing Your Life with Your Cycle”!
This guide shows you how to immediately start planning your life in sync with your cycle so you can schedule job interviews, dates, project launches, shopping, even your wedding on the best days of your monthly cycle.