I am allergic to the bismuth in a lot of the mineral powder foundations, makes me feel like ants are crawling all over my face and sodium benzoate, which is one of the few preservatives permitted in organic skin care causes the itchiest of rashes, whether ingested, it is often used in diet drinks, or applied to my skin, it is odd though, I've been fine with it on my legs (but I now use EVOO as I read it is really good for legs with poor circulation), but anywhere above my waist and my skin goes red and itches like I've been wearing Shetland wool, however, it hasn't affected my face nor my hands, so far!