This book was helpful when I was older and feeling a bit anxious about my autonomic nerves, possibly due to caregiver fatigue. Thanks to it, I'm doing well. It also includes breathing exercises. As shown in the third photo, there is one instance of writing in the book where I did a self-check. Please be aware of this. I kept it covered, so it's clean except for the writing. The following is AI information... A practical book explaining health methods utilizing serotonin. - Author: Hideo Arita, Ichiro Nakagawa - Title: Serotonin Brain Health Method - ISBN: 978-4-8022-6030-0 - Price: 838 yen + tax