Shampoo alert

Don't follow my advice about buying Tesco shampoo. The conditioner's still fine but the shampoo has been bothering me since I used it. It's Christmas and I'm already pushing my tolerance levels to the limit, eating dodgy chocolates and fudge with funny flavourings and accepting foods pushed at me because they're bound to be okay (although to be fair everyone's been very kind and tried to help. I had rice pudding on Christmas Day following by a chocolate Christmas cake). This morning I used the shampoo and it might have been acid. My skin hated it. I then checked the ingredients - there are lots of chemical names, none of them readily identifiable with wheat or maize. The only identifiable ingredient is castor oil - which is made from the castor bean and is by no stretch of the imagination wheat or corn. I'll be writing to Tesco...