Well, the reason I asked this question is actually for my wife. My wife has a very nice body. Her measurements are 36, 25 , 36. She is 5' 4" and weighs 124lbs. Everything is fine on her body. But she says that she wants her abs and the little bit of fat/water around the waist to go down. That way she can have measurements of 36, 24, 36.
I'm afraid that by her taking any type of fat burner will make her not only acheive what she wants. But also make her too thin looking. And my concern is not only towards clen or eca/y stack. But also for other fat burners like T-rex or Levorex.