All the methods described in this book are safe, tested, and scientifically proven.
The book focuses mostly on natural, but highly effective ways that are not so popular on the internet.
The book gives only 20% of theory and 80% of practice, focusing on practical methods to gain results.
This book covers the most effective, scientifically proven ways to naturally boost your immune system before autumn, and maximize your chances of avoiding different respiratory diseases and viruses.