IRCT20130616013678N28 IRCT 2019-02-14 Oroumia University of Medical Sciences The effect of L-arginine with vitamin C supplementation on nitrogen balance , body composition, VO2max, serum growth hormone, testosterone and cortisol in male body builders The effect of L-arginine with vitamin C supplementation on nitrogen balance , body composition, VO2max, serum growth hormone, testosterone and cortisol in male body builders 2018-07-01 anticipated 54 Complete https://irct.ir/trial/33749 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Numbers 1 to 54 are written on the sheets and placed in a container and each patient is asked to pick a sheet randomly. At the end the ones with even numbers are placed in intervention group and the ones with odd numbers are placed in control group, Blinding description: This study is a double blinded clinical trial that participants are randomly classified into two groups of intervention and control and none of them know in which group they are. Researchers are unaware which participants are receiving the real treatment. 3 Condition 1: l-arginine and vitamin c supplementation. Condition 2: athletic performance,vo2max. Condition 3: nitrogen balance. Condition 4: Growth Hormone ,testosterone and cortisol. Condition 5: male body builders. Intervention 1: Intervention group: The first group will receive a 3 gram L-Arginine supplement(karen pharmaceutical company) per day with 500 mg vitamin C (Jalinous pharmaceutical company) for the period of 6 weeks. Intervention 2: Control group: The second group will receive a 3 gram L-Arginine supplement per day with 500 mg placebo (instead of vitamin C) for the period of 6 weeks. No - There is not a plan to make this available Justification or reason for not sharing IPD is -