Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Horrible do not buy!!!!

I purchased this product because my hair dresser reccommended it. Soon after using this product I broke out in a horrible rash on my neck. I made an appointment with a dermatologist who suggested it was likely the Shampoo that caused my terrible rash. I have a strong suspicion that the product I received was not actually absolute hair repair but a cheap rash causing substitute. My advice do not buy from this seller!