Kryptopyrroluria – KPU – is a metabolic disorder that is still practically unknown in the UK, despite the fact that Dr. Carl C. Pfeiffer identified it back in the 1970s as being prevalent in the West, and an underlying factor in a vast range of conditions, from ME, fibromyalgia and multiple chemical sensitivity to thyroid disorders, ADHD, depression and epilepsy. Dr. Pfeiffer found that around 30% of patients labelled schizophrenic were suffering from KPU, and