Inclusion and exclusion criteria
medical/neurological disorder, head injury, allergy, schizophrenia, cognitive deficit
ALLERGY
The inclusion criteria were: (a) participants were required to meet International Classification of Disorder‐Tenth Edition criteria for schizophrenia with predominant negative symptoms as measured by SANS total scores ≥60 at baseline; (b) cognitive deficit below 15th percentile in any one cognitive domain measured using National Institute for Mental Health and Neurosciences (NIMHANS) Neuropsychological battery; andParticipants were excluded if they had (a) any other concurrent co‐morbid axis I diagnosis including substance use or dependence in the past 12 months; (b) history of serious medical/neurological disorder, known allergy to L‐carnosine; (c) past history of head injury resulting in loss of consciousness or neurosurgery; (d) mental retardation; (e) pregnant or lactating women; and (f) uncooperative due to severity of illness.A sample size of 76 was calculated based on previous studies on augmentative therapy in stable schizophrenia. Considering an attrition of 20%, a sample size of 92 was considered which was then rounded off to 100.