The aim of this study is to evaluate the effect of Vitamine C supplements to be helpful to reduce the postoperative pain after laparoscopic cholecystectomy through the double-blinded randomized controlled trial.

The aim of this study is to evaluate the effect of Vitamine C supplements to be helpful to reduce the postoperative pain after laparoscopic cholecystectomy through the double-blinded randomized controlled trial.

The primary purpose of this study is to confirm the reduce of postoperative pain through the oral supplement of Vitamine C before and after the surgery. For this purpose, we compared the dosage or counts of opioids usage with the oral supplement of Vitamine C or not.

The secondary purpose is to assess the pain score, postoperative morbidities, postoperative length of stay or postoperative time between two groups.

Inclusion Criteria:

• chronic cholecystitis
• gallbladder polyp

Exclusion Criteria:

• grade I Tokyo guideline for acute cholecystitis
• grade II Tokyo guideline for acute cholecystitis without the evidence of gallbladder perforation
• gallbladder cancer
• the patient who underwent reduced port surgery
• the patient who underwent common bile duct exploration during the operation
• the patient who underwent concurrent operation
• the patient who had past history of upper abdominal surgery
• the patient who had a immunodeficiency state
• the case which had a suspicion of delayed bile leakage
• the case which had a incomplete cystic duct ligation
• the patient who underwent open conversion surgery during the operation
• the patient who had a high risk of bleeding