Due to the methodological limitations of single case reports, conclusions should be formulated carefully. The patient described in this article was included in the PULSAR study – a 6-month randomized double-blind placebo controlled trial – which evaluated the efficacy and safety of sarcosine in patients with schizophrenia. The PULSAR study has been reviewed by the Ethics Committee of Medical University of Łódź and was therefore performed in accordance with the ethical standards laid down in the 1975 Declaration of Helsinki.
