IRCT20231109060002N1 IRCT 2023-11-23 Yazd University of Medical Sciences The effectiveness of vitamin D supplementation on schizophrenia symptoms The effectiveness of vitamin D supplementation on schizophrenia symptoms 2023-11-22 anticipated 72 Complete https://irct.ir/trial/73674 interventional Randomization: Randomized, Blinding: Triple blinded, Placebo: Used, Assignment: Parallel, Purpose: Supportive, Randomization description: The participants are randomly divided into each intervention and control group by simple random method using the RAND function of Excel software, Blinding description: The method of blinding the participants, researchers and the statistical analyzer of the plan to the intervention pills is that for this purpose, the manufacturer packs the capsules in similar packages and identifies them with the names A and B. Until after the researchers study, the participants and the statistical analyzer do not know about their nature, and a trusted expert will know about the main nature of the supplement and placebo until the end of the project. N/A Schizophrenia. Intervention 1: Intervention group: According to previous studies, the dose of vitamin D supplement is 50,000 IU weekly for 12 weeks, and after 12 weeks (three months from the start of taking the supplement), the supplement is taken once a month. It is consumed until the end of the 24th week (6 months from the start of taking the supplement). At the beginning of the study and at the end of the 12th week and at the end of the 24th week, the level of vitamin D and the score of the psychological tests are evaluated. Intervention 2: Control group: Placebo (sunflower oil) with the same packaging as a 50,000 IU dose supplement is considered weekly. It is considered weekly for a period of 12 weeks, and after 12 weeks (three months from the start of taking the placebo), the placebo is taken once a month until the end of the 24th week (6 months from the start of taking the placebo). At the beginning of the study, at the end of the 12th week and at the end of the 24th week, the level of vitamin D and the score of the psychological tests are evaluated. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information