The present invention addresses the problem of providing: a lactic acid bacterium which has at least one effect selected from a fatigue-improving effect, a blood flow-improving effect, a stool odor-improving effect and a growth-promoting effect and is highly safe； and a preparation containing, as an active ingredient, a lactic acid bacterium having at least one effect selected from a fatigue-improving effect, a blood flow-improving effect, a stool odor-improving effect and a growth-promoting effect, a treatment product of the lactic acid bacterium or an extract residue of the lactic acid bacterium. The present invention provides: a novel lactic acid bacterium which belongs to Enterococcus faecium, has specific mycological properties, and also has such properties that the survival rate of living cells of the bacterium is 40% or more when the living cells are lyophilized in the absence of a dispersion medium and the survival rate of living cells of the bacterium in a living cell preparation is 80% or more when the preparation is stored at 40˚C for 4 months； a composition which contains the lactic acid bacterium； any one agent selected from a fatigue-improving agent, a blood flow-improving agent, a stool odor-improving agent and a growth-promoting agent, which contains the composition as an active ingredient； and the use of the composition in a food or the like.La présente invention aborde le problème de fournir : une bactérie lactique qui a au moins un effet choisi parmi un effet améliorateur de la fatigue, un effet améliorateur du débit sanguin, un effet améliorateur de l'odeur des selles et un effet favorisant la croissance, et est hautement sûre ； et une préparation contenant, en tant que principe actif, une bactérie lactique ayant au moins un effet choisi parmi un effet améliorateur de la fatigue, un effet améliorateur du débit sanguin, un effet améliorateur de l'odeur des selles et un effet favorisant la croissance, un produit de traitement de la bactérie lactiqu
