Welcome to the Award Winning
Hypnotherapy Clinic Dublin
My name is Jason O’Callaghan, I am a consulting psychologist and my speciality is clinical Hypnotherapy and behavioural science.
I hold a Masters degree from Trinity College in Applied Psychology, a BA (Hons) in Psychology plus qualifications in CBT and Counselling. I am Certified Instructor with the world’s biggest hypnotherapy organisation, the National Guild of Hypnotherapy (USA)
Since 2012 The D4 Clinic Blackrock has become nationally and internationally known as the leading clinical and medical hypnotherapy in Ireland and can be seen within the national and international media as the leading experts in the field.
We also speak at over 100 events and conferences each year in Ireland and the USA demonstrating the power of the mind for corporate, social and educational events.
We help clients with weight loss, stop smoking, fear/phobias, confidence, addiction, public speaking, IBS, insomnia, anxiety, depression, eating issues such as selective eating disorder, exam stress plus many more day to day issues.
My partner in the clinic is dietitian Carina, She has spent the past 20 years working as a senior dietitian in Crumlin Children’s Hospital and is CORU registered.
I went to see Jason in September 2017 and with his help I lost 60lbs in 12 weeks and lost a total of 75lbs in 21 weeks. I wouuld highly recommend Jason to anyone who wants to lose weight. I have maintained my weight with the 75lbs loss now for 2 years. Thank you Jason More...
I had a severe fear of flying. I thought I would never fly again. Did the session with Jason and I was able to fly to America to bring my children on their first holiday. Flying prior to that I always used valium so this time I was medication free and no panic attacks. Great that you can relisten to the hypnosis yourself at home or anywhere else if needed. I would highly recommend. More...
Jason is a true master of his craft. A complete professional & a pleasure to deal with. Highly recommended 10/10
Both my Daughter and myself have benifited greatly from attending Jason at D4. My session was so benificial for Back Pain , I have had many years of pain post surgery , I am now improved immensely. My Daughter attended prior to exams , her session helped her greatly during her exams. I would have no hesitation in recomending D4 , not only for the initial treatment but the follow up session , having the recordings is highly benificial More...
I started with Jason at the end of April this year. And to date I have lost 2 stone 1 lb. For me this is incredibly. I have done so may diets over the last 30 years, from diet pills, slimming drops , weight watchers, cabbage soup diets you name it I did it and it was always so hard and I never successes. The last 3 months have been the easiest 3 months I have ever had with weight loss. I have put in no effort and have never failed. I don't even want to eat crap any more. I love this life style change and for me it is worth every penny I paid for it. Can not recommend Jason's weight loss programme enough. Thank you More...
Bridget O Sullivan
Outstanding results..off the cigarettes 7 months today.and no desire to go back to them..thank you so much for all your help..highly recommend.
Jason is lovely and welcoming. Felt instantly at ease. Just had my first session but already feeling a massive shift in my perception of food. Looking forward to seeing the results as I follow his simple programme More...
I'm an absolute chocoholic and decided to purchase Jason's session's for weight loss. Last night I listened to the first of the 6 sessions and I had the best sleep ever, I didn't expect this and I'm delighted to have slept so well! Today I'm feeling differently about food, which I find amazing, after listening to just one session. Today I actually felt like going for a walk, it has to come from listeningt to last night's session, I NEVER feel like going for a walk, I usually have to make myself get out for a walk! I'm feeling excited about this journey I'm on and feel grateful to Jason, so happy I contacted him now!! :) More...
Great hypnotist offering a great service well done!!!!
I had a massive fear of flying and for the last few years i drove all over Europe instead of flying. I went to D4 clinic twice and on 27th of may i took my first flight! Jason really did good for me as now I've got no fear at all and he even text me after i landed to find out how i was Regards Alex bistro53 Maynooth More...
1 year off the smokes since october last year - all thanks to Jason. over 3 k in savings.
If you want to give up smoking then you really should book into see Jason, I have been off cigarettes now for 8 months, my health is better and I have saved a fortune.
Day 3 and for someone who would eat chocolate any minute of the day possible especially in bed, where I could eat two bars at least purely through habit, to having 1 bar in three days I'm delighted! I just had it for something nice rather then have to eat it, have to have it, walking my hour a day because I want to! So happy with myself! More...
Very pleased with the service provided. Have gone from size 20 to size 14 since my sessions in June and July, and still losing weight.
Alison Mc Gregor
I literally couldn't recommend Jason enough he changed my life for the better I had the worst diet ever couldn't stomach new or healthy foods now I'm a different person after one session a week on ive swapped the crisps to fruit ! amazing experience
5 weeks today of the smokes and feeling great, thanks Jason
It's works,five weeks of the smokes,happy days.
10 days off the smokes after 1 session highly recommend