You know....at the risk of getting some flack for this, the more and more I read my Essential Oil Safety tome by Robert Tisserand and Dr. Robert Young, the less and less absolute trust I have for IFRA recommendations. In the book by Tisserand and Young, they give a fair, well-rounded critical review of IFRA (which is funded by corporations with vested interests, btw) and write of there being lots of concerns in the scientific community that the science IFRA is using to make their assessments has lots of gaps, that their guidelines are too complex, arbitrary, and are pushed through without having vetting independent scientific sources, and go way overboard in certain instances in spite of known, reliable, published scientific data to the contrary. And it seems they have a history of publishing guidelines while withholding some of the data they are based on. Speaking only for myself, I've always used Cedar & Saffron at 5% in my soap without any issues and will continue to do so.
IrishLass