Neutrogena T/Gel Therapeutic Shampoo - 250ml. Neutrogena T/GelTherapeutic Shampoo contains Neutar™ Solubilised Coal Tar extract, which treats an itchy, flaky scalp. It is an effective treatment for dandruff, scalp psoriasis and seborrhoeic dermatitis of the scalp. It helps alleviate itching, reduce flakes and calm redness, leaving your hair shiny and manageable.