The present invention provides a blood flow promoting agent containing citrulline or a salt thereof and capsaicin or capsaicinoids as active ingredients, which is safe even by long-term administration, a food with health claims and a functional food affording such action, particularly, a blood flow promoting agent exhibiting an effective vasodilatory action of capsaicin at a low dose free of irritant property, which can be applied to improvement of athletic performance exhibited in relation to peripheral vasodilatation, suppression of fat accumulation, improvement of skin quality, as well as securing blood circulation in ischemic disease and the like, relaxation of blood vessel biased to coarctation due to advancing age, lifestyle-related diseases and the like, prophylaxis of arteriosclerosis, and prophylaxis of stiff neck, feeling of cold, erectile dysfunction, thrombosis and the like due to blood flow disorder.
