there are all kinds, but standard process makes a good one and so does dr wilson, which you can get on his site. I have been using his for quite some time now. it is called adrenal rebuilder. it is a multi glandular. it is my favorite. just put in a search for dr wilson adrenal fatigue and you'll get his site. He sells quite a few adrenal products, this is the only one i use. they are hormone free. leslie