Do you have any idea how cortisol functions? I am going to say no. Extreme cases of high cortisol is called Cushing's syndrome. Want to know it's most common symptom? Weight gain. Now, we're not dealing with people who have Cushing's, nor are we marketing pharmaceuticals. These products will help negate the negative effects that raised cortisol from training, dieting and life stress wreaks on the body. To say that cortisol has no/negligible effect on the average person is ignorant. Is it make or break to diet success? No. No supplement is. Will it help a person lose weight successfully? Absolutely.
I should have clarified that a normal, healthy human being is not going to have cortisol levels high enough to trigger weight gain. If there's a study that shows cortisol blockers help with weight loss in healthy people then I'd love to see it.
Some people have a condition which causes them to have abnormally high cortisol levels which can have negative effects. That's true.
But raised cortisol from training, diet and stress does not wreak havoc on the body because it does not raise cortisol high enough to have any impact. Again, if you have a study that shows cortisol "wreaking havoc" on the body of healthy people pass it along.
For those who are curious, if you do a Google search you'll find two kinds of results -- those from supplement companies and propaganda sites, and legitimate sites that debunk the former.
Will a cortisol blocker help a
healthy person (even if stressed, dieting, weight-trained, etc.) lose weight successfully? Absolutely NOT. And there is plenty of science to support this.