**Title: Understanding Peptides: A Comprehensive Guide**

**Introduction**
- Definition of peptides
- Importance in biology and medicine

**Chapter 1: What Are Peptides?**
- Structure and composition
- Difference between peptides and proteins

**Chapter 2: How Peptides Work in the Body**
- Role in cell signaling
- Functions in hormone regulation and immune response

**Chapter 3: Types of Peptides**
- Hormonal peptides
- Neurotransmitter peptides
- Antimicrobial peptides
- Therapeutic peptides

**Chapter 4: Peptides in Medicine**
- Overview of peptide therapies
- Applications in treating diseases
- Current research and clinical trials

**Chapter 5: Peptides in Fitness and Anti-Aging**
- Use in muscle growth and fat loss
- Benefits for skin health and longevity

**Chapter 6: Peptides and Supplements**
- Popular peptide supplements
- Safety and efficacy considerations

**Chapter 7: How to Incorporate Peptides into Your Routine**
- Consulting healthcare professionals
- Dosages and administration methods

**Conclusion**
- Future of peptide research
- Summary of key points

**Resources**
- Recommended readings
- Scientific publications and websites

This ebook provides a thorough understanding of peptides, their functions, and their applications in health and wellness.

Chapter 1: Introduction to Peptides

Chapter 2: Types and Roles of Peptides

Chapter 3: Therapeutic Applications of Peptides