I definitely agree, but there is really no way to tell if one is reaction adversley to a product or if it is die-off, unless you really know your die-off symptoms well.
I guess it's just a risk we have to take.
Having said that, I actually know a lady who uses crystals and a weird looking box thing to test if products will react well with your body. I don't know what it's called but she's always right on the money when it comes to finding out what wrong with people. She was the one who first diagnosed me with candida and mercury poisoning, and now that you have got me thinking about adverse reactions san sucre, I think I would feel much more comfortable with my products if I took them all to her first and asked her to test them all for me, especially the Interfase cos that one scares me. She does it for free aswell ...bonus!