You mentioned that you are using OxCygen instead of a product with cascara - could you let me know the name of the company which makes the OxCygen? I also have problems with cascara ( and also with psyllium) because of leaky gut. I find that these products worsen it. I have recently been diagnosed with Lyme disease (caused by Borrellia bacteria) which settles in many places and seems to be the main cause in my case of the leaky gut. Unfortunately it is also a cause of constipation, so there is a rather vicious circle. Your post was a long time ago, so I hope you have been helped since then.
Hope you'll be able to let me know about the OxCygen capsules.