Here is a comprehensive and modern list of textbooks that cover hormone optimization across various levels of expertise. This list is structured by novice, intermediate, advanced, expert, and elite categories along with a rough progression timeline:
### Level 1: Novice (0-6 months)
1. **"The Hormone Handbook" by Thierry Hertoghe**
- Overview of hormones and their functions; ideal for beginners.
2. **"Hormones: A Very Short Introduction" by