Branched-chain amino acid (BCAA) is known to reduce the relapse rate of liver cancer as it is associated with insulin resistance and has been reported to improve the progression of liver fibrosis when used in combination with an angiotensin-converting enzyme. With regard to the effect of liver function improvement, in a research conducted in South Korea, approximately 41.2% of the patients showed recovery of the normal albumin level when BCAA was administered to them for about 10 weeks during radiation therapy for liver cancer. Additionally, in other overseas researches, the changes in the values of total protein and albumin were significantly smaller in the patients who underwent transarterial chemoembolization (TACE) to whom BCAA was administered than in those to whom BCAA was not administered.