My son was diagnosed with GDD used to be very naughty, loud, out of focus, moody, and easily annoyed or angered for no reason. I tried to use Thinker Oil so that he could somehow concentrate on his studies and all the activities he would do at home. I apply religiously this Thinker Oil every morning in his temple and nape, then every night before he goes to bed. I combine it with Calmer Oil. I continuously do that every day until he himself applies it on his own every morning and night. It was a worthy result and effect for him and of course, for all of us in the family. Why? Because he became more focused on his studies, well organized, and no more ear-splitting. Sometimes he has several profound questions that I can no longer answer. But more importantly, he already knows what tasks he must do every day. He has made his own daily schedule. It's a great job! What is more? His grades are good, and he excelled in class. I am very grateful because it has had a good effect on my son.