The present invention relates to a peptide that is derived from a milk protein and has an antioxidative effect, an antioxidant that includes the peptide as an active ingredient, and an antioxidative food, drink, or feed that includes the peptide. The present invention also relates to a peptide that is derived from a milk protein and has an adiponectin production promotion effect, an adiponectin production promoter that includes the peptide as an active ingredient, and an adiponectin production promotion food, drink, or feed that includes the peptide. The present invention further relates to a blood adiponectin level increase promotion and/or decrease inhibition agent that includes a component contained in cheese as an active ingredient, and a blood adiponectin level increase promotion and/or decrease inhibition food or drink that includes a component contained in cheese. The present invention to the peptide that consists of an amino acid sequence shown by His-Pro-Ile-Lys-His-Gln-Gly-Leu-Pro-Gln (1) , His-Pro-Ile-Lys (2) or His-Gln-Gly-Leu-Pro-Gln (3) , and has an antioxidative effect.항산화 효과 및 아디포넥틴의 생산 촉진 효과가 있는 His-Pro-Ile-Lys-His-Gln-Gly-Leu-Pro-Gln, His-Pro-Ile-Lys 혹은 His-Gln-Gly-Leu-Pro-Gln으로 나타내는 아미노산 서열로 이루어지는 펩티드를 유효 성분으로 하는 항산화제 및 이 항산화제를 배합한 음식품, 아디포넥틴의 생산 촉진제 및 이 생산 촉진제를 배합한 음식품. 또한, 치즈에 포함되는 성분을 유효 성분으로 하는 혈중 아디포넥틴 농도 증가 촉진 및/또는 감소 억제제, 혹은 치즈에 포함되는 유효 성분을 배합한 혈중 아디포넥틴 농도 증가 촉진 및/또는 감소 억제용 음식품.
