Oxaliplatin is effective in adjuvant and first-line colorectal cancer chemotherapy. Oxaliplatin-induced severe chronic neurotoxicity is the main dose-limiting adverse event. No standard treatment for oxaliplatin-induced chronic toxicity has been defined. Neurotropin has been identified as a strategy for reducing the peripheral neurotoxicity in the published studies. Our aim is to define the best intake dose and evaluate the safety of neurotropin for peripheral neurotoxicity of oxaliplatin by conducting a placebo-controlled clinical trial.