There is extensive research being conducted on the TM technique for decades which is peer-reviewed and published in leading scientific journals all over the world.
There are many benefits which are anecdotal and have also been researched and peer reviewed for last 50+ years and published in leading Scientific Journals of the world.
One of the major benefits of TM is the entire brain being active and coordinated. Hence your brain capacity keeps increasing with regular practice, instead of going down with time.
Other benefits are marked reduction in stress and anxiety, improved health and resilience to all human diseases (like diabetes, cancer, stroke, etc.), increased concentration and focus, improved academic performance, improved social relationships, increased satisfaction within the same personal and professional life, better sleep, increased clarity, etc
TM also helps deal with PTSD, Autism, ADHD, Asperger's syndrome. It is taught all over the world in schools and colleges, and people from all walks of life practice TM.
It is also taught in the different armies of the world, including USA, where it is part of the USA army curriculum.
To reiterate some of the proven health benefits of regular TM practice:
deeper and more restful sleep
lower cortisol
calmer and more balanced mind and body
healthier heart and more balanced blood pressure
higher energy and stronger immune system
greater vitality and younger biological age
Frontal Brain Coherence
Increased Use of Brain Reserves
Increased Creativity
Broader Comprehension and Improved Ability to Focus
Increased Self-Development
Increased Calmness
Increased Strength of Self-Concept
Decreased Anxiety
Decreased Depression
Deep Rest
Reduced Illness and Medical Expenditures
Reduction of High Blood Pressure
Increased Job Satisfaction
Improved Job Performance
Transcendental Meditation is a proven technology for World Peace. Watch more here.
You can read more about the research conducted on the benefits of Transcendental Meditation on the individual and the society here.