Hormonology founder Gabrielle Lichterman

pioneered the movement to live in sync with your cycle

My Hormonology

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

Hormonology Books

My Hormonology

28 Days:
Updated and Expanded Edition

Winner of the 2019 National Indie Excellence Award! 28 Days is the book that introduced the world to cycle-syncing. Written by pioneering women’s health journalist Gabrielle Lichterman, this updated and expanded edition gives you more daily categories and cycle-syncing tips than the first edition published in 2005.
Learn more…

My Hormonology

Hormonology® Menstrual Cycle
Tracker Journal

In this paperback period-tracker journal, you get 12 sets of comprehensive menstrual cycle tracker charts that help you monitor flow, basal temperature and cervical mucus as well as emotional, physical and health changes throughout your cycle. Plus, you get 12 6-page sets of dot graphs that you can use to shape your data into lists, graphs or logs.
Learn more…

Available at Amazon
United States  Canada  UK  Germany  France  Spain  Italy  Japan

My Hormonology

Hormonology® Day-by-Day Menstrual Cycle Guided Journal

In this guided paperback journal, you get 9 daily self-discovery questions, which enable you to create a custom manual for your menstrual cycle that helps you make every cycle day better. Plus, you get study-backed tips for overcoming cycle-related challenges, recommendations for syncing your life with your cycle and bonus self-discovery questions.
Learn more…

Available at Amazon
United States  Canada  UK  Germany  France  Spain  Italy  Japan

My Hormonology

Hormonology® 2-in-1 Cycle Tracker + Day-By-Day Guided Journal

This 2-in-1 journal combines the Hormonology® Menstrual Cycle Tracker Journal and Hormonology® Day-By-Day Guided Menstrual Cycle Journal into a single volume. In it, you get 12 sets of comprehensive menstrual cycle tracker charts, 12 6-page sets of dot graphs, 9 daily self-discovery questions, tips and recommendations.
Learn more…

Available at Amazon
United States  Canada  UK  Germany  France  Spain  Italy  Japan

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!

IMPORTANT: All Hormonology apps will be permanently retired by January 15, 2023. They will not be deleted from your device. However, you will not be able to download them from the App Store or Google Play after January 15. And there is no ongoing support for the apps. So, if you want to download the app before it is retired, please do so now. To learn why these apps will be retired, please read my Full Statement.

All Hormonology offerings will now be delivered in books. Right now, you can get my daily Hormone Horoscope in my book 28 DAYS: WHAT YOUR CYCLE REVEALS ABOUT YOUR MOODS, HEALTH & POTENTIAL. And you can track your cycle using my HORMONOLOGY MENSTRUAL CYCLE TRACKER JOURNAL, which are available at Amazon. More Hormonology books are coming soon. To get alerted to new books, sign up to my free mailing list.

My Hormonology

Hormone Horoscope Lite

My Hormonology

Hormone Horoscope Pro

My Hormonology

Hormone Horoscope Teen Lite

My Hormonology

Hormone Horoscope Teen Pro

My Hormonology

Hormone Horoscope Classic

My Hormonology

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.

Subscribe Bonus - Hormonology Book
Have questions or want more information? – Get in touch with Gabrielle