Hormonology founder Gabrielle Lichterman pioneered the movement to live in sync with your cycle

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Teaching women and girls how hormones impact their moods, health and behavior all cycle long. Learn more.

NEW BOOK! 28 Days: What Your Cycle Reveals About Your Moods, Health & Potential—Updated & Expanded by Hormonology founder Gabrielle Lichterman

28 Days is the book that launched the growing movement to live in sync with your cycle 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 longtime nationally-known women’s health journalist. In 2005, she pioneered the movement to live in sync with your cycle and learn all about hormonal effects with the first edition of her book, 28 Days. Learn more about her mission to spread hormone education to women and girls everywhere here.

My Hormonology

My Hormonology

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!

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Hormone Horoscope Lite

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Hormone Horoscope Pro

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Hormone Horoscope Teen Lite

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Hormone Horoscope Teen Pro

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Hormone Horoscope Classic

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Female Forecaster

Subscribe to the free newsletter to receive useful tips that help make every day of your cycle better

You’ll learn useful, study-proven cycle-related tips including…

  • Easy ways to nix anxiety when hormones put you on edge
  • How to boost energy on low-pep cycle days
  • Tricks to getting better sleep when plunging estrogen triggers insomnia
  • Recommendations for nutritional supplements that lessen premenstrual woes
  • Ways to ease (and even prevent) menstrual cramps
  • And much more!

You’ll also be the first to find out about new apps, eBooks, videos and other Hormonology tools and live chats

My Hormonology

Get useful cycle-related tips

Subscribe to my free newsletter to get useful cycle-related tips and be the first to know when new Hormonology apps, videos, books and eBooks are released. Please click all that apply below:

From the Hormonology Blog

Talks & Workshops

Want to know more about how the hormones in your monthly cycle impact you? Curious about hormonal effects on your partner, family member, patients or clients?

Hormonology Cycle Overview for Adults

Multi-Session Cycle Workshop for Adults

Hormonology Cycle Overview for Teens

Hormonology Cycle Overview for Men

Female Business Booster

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.

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Have questions or want more information? – Get in touch with Gabrielle