This is the second Briogeo product I have used on my hair that has caused a severe allergic reaction sending me to my physician for a steroid shot. Within a few hours, I broke out in hives everywhere the product and my hair touched. I'm not sure which ingredient would be the culprit as I have no known allergies and all of the ingredients appear to be natural. I wasn't sure of the cause the first time this happened, but I am now certain it was the Briogeo products.
If you think you might have any sensitivity, proceed with caution.