Whenever I've done cg or mod cg, I have shed hair like crazy! Soooo much more than I normally do. I could never figure out why. I've tried many, many, many different cg products and brands, so it's not just one particular brand.
I'm not cg anymore and will never do it again. It didn't work for me on any level, but the hair loss was quite scarey. My hair would often come out in very large clumps in the shower. I wet my hair in the shower everyday, and I lost large amounts of hair every time. I'm still trying to get my hair back to "normal". So I agree with the others who have said that it's definitely not for everyone.