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The purpose of this study is to evaluate efficacy of tyrosine as a treatment for methamphetamine dependence in an outpatient treatment setting providing group psychosocial interventions. Examine effect of tyrosine on abstinence, retention in treatment, and craving." Evaluate efficacy of tyrosine as a treatment for methamphetamine dependence in an outpatient treatment setting providing group psychosocial interventions. Examine effect of tyrosine on abstinence, retention in treatment and craving.