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The purpose of this study was to evaluate the amount of creatine present in the urine of exercising athletes ingestion with a dosage specific to their lean body tissue and at an amount approximating the maintenance dosage recommended by distributors of creatine ingestions. Male subjects(n=32) who were weight lifters(n=16) and soccer players(n=16) between the age of 19 and 25 years served for this study. In a double-blind, ramdomzed block design, 8 weight lifters and 8 soccer players were assigned to either the creatine ingestion or placebo group. As the method of urine analysis, high-performance liquid chromatography (HPLC) were carried out on a Gilson HPLC with HPLC system controller software. An SPSS-pc 2-way ANOVA procedure was used to determine if significant differences occurred between the ingestion and placebo groups for creatine and pre-to post changes. The conclusions obtained from this study were as follows; 1. In 24-hour, 48% of the ingested creatine was excreted with urine. 2. When ingesting with dosages of 0.1g/kg lean body mass or between 7∼8g at a time, about half of the ingested creatine got excreted.