The Institute of Applied Psychophysiology — the world's first clinical body dedicated to the permanent biological resolution of anxiety disorders. Not management. Resolution.

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36 emails.
The complete picture.

One email per week. Every aspect of what the Institute does — the science, the research, the recovery programmes, the evidence, and the people. Written by Charles Linden and the Institute team. Free. Unsubscribe any time.

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36

Emails in the series

1 / week

Delivery cadence

Free

No cost, ever

650k+

People the Institute has helped

What the series covers

The Science

9 emails

Biology of anxiety, the threat response, fight or flight, why symptoms feel real, and more.

Conditions

9 emails

Panic attacks, GAD, OCD, PTSD, social anxiety, agoraphobia, health anxiety, postnatal anxiety, children.

Recovery

6 emails

TRT™ explained, The Linden Method, the online programme, coaching, live webinars, and the community portal.

Research

4 emails

The NHS trial (84.5% GAD-7 reduction), working papers, Applied Psychophysiology, and the mainstream medicine question.

Professional & Corporate

5 emails

Advanced Professional Diploma, corporate wellbeing, elite sport, KOTA global children's programme.

About & Books

3 emails

Charles Linden's story, the leadership board, and the Charles Linden Library including The Only Self Help Book.

The full series — 36 emails

01Welcome to the Institute
02A New Category of Care
03The Biology of Anxiety
04Understanding the Threat Response
05Fight or Flight
06The Autonomic Nervous System
07Why Symptoms Feel So Real
08How Anxiety Becomes Chronic
09Why Avoidance Makes It Worse
10Panic Attacks — What's Really Happening
11Generalised Anxiety Disorder
12All Anxiety Disorders Are OCD
13PTSD — The Memory the Brain Won't Release
14Social Anxiety
15Agoraphobia
16Health Anxiety
17Postnatal Anxiety
18Children and Anxiety
19Threat Recalibration Therapy™
20The Linden Method — 30 Years
21The Online Recovery Programme
221:1 Anxiety Coaching
23Live Webinars With Charles Linden
24The Community Portal
25The NHS Trial: 84.5% Reduction
26Research Working Papers
27Applied Psychophysiology
28Why Mainstream Medicine Hasn't Adopted TRT™ Yet
29The Advanced Professional Diploma
30Corporate Wellbeing
31Elite Sport Programme
32KOTA — Global Children's Programme
33Charles Linden — The Story
34Leadership & Advisory Board
35Books by Charles Linden
36The Next Step — From Understanding to Recovery

Series expands as new pages, research papers, and programmes are published by the Institute.

Start the series today

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The Institute of Applied Psychophysiology · Est. 1996 · Company No. 16153717 · Registered in England and Wales

1,000s of Testimonials — Proof That Linden Recovery & TRT™ Therapy Delivers Permanent Recovery
Testimonial
Testimonial

"If you doubt this method works, check out further evidence in books such as 'rewire the brain' by John B Arden. It worked for me, and will for anyone if they…"

Hayley S.

Testimonial
Testimonial

"Just a note to anyone thinking of buying this product — It does work! I had all the symptoms including chronic muscle pain, racing heart, horrid thoughts, OC…"

Robert K.

Testimonial
Testimonial

"I just wanted to thank you personally, Charles, for your method! After only 5 weeks I have my life back. I never thought I'd feel OK again — I thought my lif…"

Gill H.

Testimonial
Testimonial

"I owe my life to Charles Linden. He was like an angel that came into my life and made me believe that I can get rid of my anxiety. I love this man with all m…"

Rey

Testimonial
Testimonial

"Just wanna say a quick thanks... You've made sense of it all now and I'm working with your pack every day. Worth every penny. The world's a better place with…"

Richard S.

Testimonial
Testimonial

"I found the programme during a time of suffering from acute anxiety and panic attacks. Not a single panic attack since, and that was 4 years ago. I know I'll…"

Julie G.

Testimonial
Testimonial

"God Bless you, for you already have changed my life over 5 years ago! I know your method works because I'm set free by it! You are a gift from God and I than…"

Bill S.

Testimonial
Testimonial

"I found your website by chance and I can believe it — I've read only the first 12 pages and for me it's enough! You can believe or not, but the change was im…"

Dr. Branko M., MD, MS — Serbia

Testimonial
Testimonial

"Charles Linden is doing things in the anxiety recovery field that no one else has even tried to do. For years I thought I was going mad, now I'm anxiety free…"

Rob K.

Testimonial
Testimonial

"Recovery is real. It actually happens. I didn't believe it was possible. Then I did Linden Recovery & TRT™ Therapy. I am now anxiety free and have been for o…"

Kezia B.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy has made me more self-confident, less anxious, and a much more compassionate person. I have been doing it for a year now and h…"

Isabelle R.

Testimonial
Testimonial

"You have a great gift from God in helping people my friend, keep up the good work! To all who may be curious or skeptical — it really does work! Stick with t…"

Brad H.

Testimonial
Testimonial

"It's amazing how much more relaxed I feel. I'm actually looking forward to life's big changes rather than frightened! I'm so thankful I came across Linden Re…"

Jennifer M.

Testimonial
Testimonial

"I had agoraphobia for 6 years and changed over 20 psychologists and psychiatrists but they couldn't help. After 6 years, I'm OUT again, feel so good, like no…"

Danejla K.

Testimonial
Testimonial

"This method works! Don't bother with all the other therapies out there that promise to work and cost a fortune. Mr Linden, you rock! I wish I had found the m…"

Lisa K.

Testimonial
Testimonial

"I bought the method about 18 months ago. Right now I feel free of anxiety and panic attacks. Thank you."

Elizabeth P.

Testimonial
Testimonial

"I've been doing Linden Recovery & TRT™ Therapy for 2 weeks and oh my God — the difference! I was sat in the car today and had an attack and it just washed ov…"

Caz P.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy changed my life. I suffered for years with panic attacks and anxiety. Within weeks of starting the programme I was a different…"

Mark T.

Testimonial
Testimonial

"I've tried CBT, medication, hypnotherapy — nothing worked until Linden Recovery & TRT™ Therapy. The science behind it finally made sense of what was happenin…"

Sarah W.

Testimonial
Testimonial

"Charles Linden is a genius. Simple as that. He understood what was happening in my brain when no doctor or therapist could explain it. His method gave me my …"

David H.

Testimonial
Testimonial

"I was housebound for three years with agoraphobia and severe anxiety. Linden Recovery & TRT™ Therapy got me out of the house, back to work, and living life a…"

Angela M.

Testimonial
Testimonial

"My daughter was suffering terribly with anxiety at age 16. Within six weeks of Linden Recovery & TRT™ Therapy she was back at school, socialising, and laughi…"

Louise B.

Testimonial
Testimonial

"I was sceptical — very sceptical. But after six months of conventional therapy going nowhere, I tried Linden Recovery & TRT™ Therapy. Three months later I ca…"

James F.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy is the only anxiety treatment that actually addresses the cause rather than the symptoms. Everything else I tried just masked …"

Karen S.

Testimonial
Testimonial

"I've recommended Linden Recovery & TRT™ Therapy to everyone I know who struggles with anxiety. The results speak for themselves. Charles Linden has done some…"

Michael O.

Testimonial
Testimonial

"After years of CBT and medication I thought I would never be free. Linden Recovery & TRT™ Therapy showed me how to actually switch off the anxiety at its sou…"

Patricia G.

Testimonial
Testimonial

"I work as a nurse and see anxiety patients every day. I recommend Linden Recovery & TRT™ Therapy to every single one of them. The neurological explanation is…"

Susan T., RN

Testimonial
Testimonial

"Charles — you saved my marriage. My anxiety was destroying everything. Linden Recovery & TRT™ Therapy turned everything around in a matter of weeks. My husba…"

Claire R.

Testimonial
Testimonial

"I had panic disorder so severe I couldn't drive. After Linden Recovery & TRT™ Therapy I drove to Scotland from London — alone. That's the power of this progr…"

Tony W.

Testimonial
Testimonial

"The simplicity of Linden Recovery & TRT™ Therapy is what makes it so powerful. No complicated techniques, no pills, no side effects. Just a clear, logical pa…"

Fiona K.

"I cried when I read the testimonials on Linden Recovery & TRT™ Therapy website because I thought — finally, someone who understands. Charles Linden understan…"

Rachel H.

"My anxiety had become so bad I'd stopped eating properly, stopped seeing friends, and barely left my room. Linden Recovery & TRT™ Therapy brought me back to …"

Emily S.

"I've battled health anxiety for 20 years. Tried everything. Linden Recovery & TRT™ Therapy is the first and only thing that has actually resolved it. I genui…"

Graham L.

"Intrusive thoughts had ruined my life for 15 years. Linden Recovery & TRT™ Therapy explained why they happen and, more importantly, how to stop them. I wish …"

Nicola P.

"Social anxiety had left me isolated and unemployed. After Linden Recovery & TRT™ Therapy, I got a job, made friends, and started dating. My life has complete…"

Dan K.

"My son was suffering with OCD and anxiety at age 12. The child-appropriate version of Linden Recovery & TRT™ Therapy was incredible. He's been symptom-free f…"

Helen W.

"I flew long-haul for the first time in 11 years after completing Linden Recovery & TRT™ Therapy. I actually enjoyed the flight. I cannot describe how impossi…"

Andrew B.

"The explanation of the fear response system and how anxiety perpetuates itself was the lightbulb moment I needed. Once I understood the mechanism, Linden Rec…"

Dr. Jane M.

"Every penny spent on Linden Recovery & TRT™ Therapy was worth it. I've spent tens of thousands on therapy over 10 years with no lasting result. Linden Recove…"

Peter C.

"I thought I was broken beyond repair. My anxiety was with me every waking moment for seven years. Linden Recovery & TRT™ Therapy proved me wrong — and I am d…"

Tracey L.

Testimonial
Testimonial

"If you doubt this method works, check out further evidence in books such as 'rewire the brain' by John B Arden. It worked for me, and will for anyone if they…"

Hayley S.

Testimonial
Testimonial

"Just a note to anyone thinking of buying this product — It does work! I had all the symptoms including chronic muscle pain, racing heart, horrid thoughts, OC…"

Robert K.

Testimonial
Testimonial

"I just wanted to thank you personally, Charles, for your method! After only 5 weeks I have my life back. I never thought I'd feel OK again — I thought my lif…"

Gill H.

Testimonial
Testimonial

"I owe my life to Charles Linden. He was like an angel that came into my life and made me believe that I can get rid of my anxiety. I love this man with all m…"

Rey

Testimonial
Testimonial

"Just wanna say a quick thanks... You've made sense of it all now and I'm working with your pack every day. Worth every penny. The world's a better place with…"

Richard S.

Testimonial
Testimonial

"I found the programme during a time of suffering from acute anxiety and panic attacks. Not a single panic attack since, and that was 4 years ago. I know I'll…"

Julie G.

Testimonial
Testimonial

"God Bless you, for you already have changed my life over 5 years ago! I know your method works because I'm set free by it! You are a gift from God and I than…"

Bill S.

Testimonial
Testimonial

"I found your website by chance and I can believe it — I've read only the first 12 pages and for me it's enough! You can believe or not, but the change was im…"

Dr. Branko M., MD, MS — Serbia

Testimonial
Testimonial

"Charles Linden is doing things in the anxiety recovery field that no one else has even tried to do. For years I thought I was going mad, now I'm anxiety free…"

Rob K.

Testimonial
Testimonial

"Recovery is real. It actually happens. I didn't believe it was possible. Then I did Linden Recovery & TRT™ Therapy. I am now anxiety free and have been for o…"

Kezia B.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy has made me more self-confident, less anxious, and a much more compassionate person. I have been doing it for a year now and h…"

Isabelle R.

Testimonial
Testimonial

"You have a great gift from God in helping people my friend, keep up the good work! To all who may be curious or skeptical — it really does work! Stick with t…"

Brad H.

Testimonial
Testimonial

"It's amazing how much more relaxed I feel. I'm actually looking forward to life's big changes rather than frightened! I'm so thankful I came across Linden Re…"

Jennifer M.

Testimonial
Testimonial

"I had agoraphobia for 6 years and changed over 20 psychologists and psychiatrists but they couldn't help. After 6 years, I'm OUT again, feel so good, like no…"

Danejla K.

Testimonial
Testimonial

"This method works! Don't bother with all the other therapies out there that promise to work and cost a fortune. Mr Linden, you rock! I wish I had found the m…"

Lisa K.

Testimonial
Testimonial

"I bought the method about 18 months ago. Right now I feel free of anxiety and panic attacks. Thank you."

Elizabeth P.

Testimonial
Testimonial

"I've been doing Linden Recovery & TRT™ Therapy for 2 weeks and oh my God — the difference! I was sat in the car today and had an attack and it just washed ov…"

Caz P.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy changed my life. I suffered for years with panic attacks and anxiety. Within weeks of starting the programme I was a different…"

Mark T.

Testimonial
Testimonial

"I've tried CBT, medication, hypnotherapy — nothing worked until Linden Recovery & TRT™ Therapy. The science behind it finally made sense of what was happenin…"

Sarah W.

Testimonial
Testimonial

"Charles Linden is a genius. Simple as that. He understood what was happening in my brain when no doctor or therapist could explain it. His method gave me my …"

David H.

Testimonial
Testimonial

"I was housebound for three years with agoraphobia and severe anxiety. Linden Recovery & TRT™ Therapy got me out of the house, back to work, and living life a…"

Angela M.

Testimonial
Testimonial

"My daughter was suffering terribly with anxiety at age 16. Within six weeks of Linden Recovery & TRT™ Therapy she was back at school, socialising, and laughi…"

Louise B.

Testimonial
Testimonial

"I was sceptical — very sceptical. But after six months of conventional therapy going nowhere, I tried Linden Recovery & TRT™ Therapy. Three months later I ca…"

James F.

Testimonial
Testimonial

"Linden Recovery & TRT™ Therapy is the only anxiety treatment that actually addresses the cause rather than the symptoms. Everything else I tried just masked …"

Karen S.

Testimonial
Testimonial

"I've recommended Linden Recovery & TRT™ Therapy to everyone I know who struggles with anxiety. The results speak for themselves. Charles Linden has done some…"

Michael O.

Testimonial
Testimonial

"After years of CBT and medication I thought I would never be free. Linden Recovery & TRT™ Therapy showed me how to actually switch off the anxiety at its sou…"

Patricia G.

Testimonial
Testimonial

"I work as a nurse and see anxiety patients every day. I recommend Linden Recovery & TRT™ Therapy to every single one of them. The neurological explanation is…"

Susan T., RN

Testimonial
Testimonial

"Charles — you saved my marriage. My anxiety was destroying everything. Linden Recovery & TRT™ Therapy turned everything around in a matter of weeks. My husba…"

Claire R.

Testimonial
Testimonial

"I had panic disorder so severe I couldn't drive. After Linden Recovery & TRT™ Therapy I drove to Scotland from London — alone. That's the power of this progr…"

Tony W.

Testimonial
Testimonial

"The simplicity of Linden Recovery & TRT™ Therapy is what makes it so powerful. No complicated techniques, no pills, no side effects. Just a clear, logical pa…"

Fiona K.

"I cried when I read the testimonials on Linden Recovery & TRT™ Therapy website because I thought — finally, someone who understands. Charles Linden understan…"

Rachel H.

"My anxiety had become so bad I'd stopped eating properly, stopped seeing friends, and barely left my room. Linden Recovery & TRT™ Therapy brought me back to …"

Emily S.

"I've battled health anxiety for 20 years. Tried everything. Linden Recovery & TRT™ Therapy is the first and only thing that has actually resolved it. I genui…"

Graham L.

"Intrusive thoughts had ruined my life for 15 years. Linden Recovery & TRT™ Therapy explained why they happen and, more importantly, how to stop them. I wish …"

Nicola P.

"Social anxiety had left me isolated and unemployed. After Linden Recovery & TRT™ Therapy, I got a job, made friends, and started dating. My life has complete…"

Dan K.

"My son was suffering with OCD and anxiety at age 12. The child-appropriate version of Linden Recovery & TRT™ Therapy was incredible. He's been symptom-free f…"

Helen W.

"I flew long-haul for the first time in 11 years after completing Linden Recovery & TRT™ Therapy. I actually enjoyed the flight. I cannot describe how impossi…"

Andrew B.

"The explanation of the fear response system and how anxiety perpetuates itself was the lightbulb moment I needed. Once I understood the mechanism, Linden Rec…"

Dr. Jane M.

"Every penny spent on Linden Recovery & TRT™ Therapy was worth it. I've spent tens of thousands on therapy over 10 years with no lasting result. Linden Recove…"

Peter C.

"I thought I was broken beyond repair. My anxiety was with me every waking moment for seven years. Linden Recovery & TRT™ Therapy proved me wrong — and I am d…"

Tracey L.

Click to view all 76 written testimonials & 226 documents →

The IOAP Newsletter

36 emails. The science, research, programmes, and evidence — delivered free, one email per week.

IOAP Newsletter — 36-email series

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