Diagnose my Hair Welcome to John Carne! As a John Carne customer our team of experts can help you diagnose your current hair condition and recommend products that will transform your hair into ultimate beauty! We have the products to cleanse, treat, prime and style your locks! Tell us in detail your hair dilemma in the form below and one of our experts will email your solution as soon as possible. Name* Email* Ask your question here*NameThis field is for validation purposes and should be left unchanged.