PROBLEM TO BE SOLVED: To provide a blood flow improving agent that can effectively improve blood flow.SOLUTION: Provided is a blood flow improving agent containing S-allyl cysteine as an active ingredient. Preferably the content of S-allyl cysteine is 0.01 g/100 g or more. The blood flow improving agent can be applied to food/drink and pharmaceutical, especially food/drink for recovery from fatigue and/or reduction of fatigue feeling.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】血流を効果的に改善させることができる、血流改善剤の提供。【解決手段】S-アリルシステインを有効成分とする、血流改善剤。S-アリルシステインの含有量が、0.01g/100g以上であることが好ましい。血流改善剤は、飲食品及び医薬品、特に疲労回復及び/又は疲労感の低減用飲食品に適用可能である。【選択図】図1