I was very excited to try this product when it arrived in my August box. The smell is fantastic, and the oil felt great in my hair, making it feel soft without feeling greasy; HOWEVER, within an hour or so, I started breaking out in hives all over my body. Upon looking up the ingredients in the oil, I noticed one thing--Argan oil (which I am allergic to). So, if you also have an argan oil allergy, AVOID this product at all costs!
Side note: would be great if Birchbox could put the ingredients of the products on the little card that comes in the box, or created a section in the customer profile section where you can specify allergies--I wouldn't want someone else to go through what I did when using this sample!