| abstract |
[PROBLEMS] To provide an oral preparation effective for improving brain fatigue (concentration, attention, memory learning ability, stress, depressive symptoms, etc.). An oral preparation for increasing the concentration of arginine in the brain, containing citrulline or a salt thereof as an active ingredient. Examples of the citrulline include L-citrulline and D-citrulline, with L-citrulline being preferred. Examples of the salt of citrulline include acid addition salts, metal salts, ammonium salts, organic amine addition salts, amino acid addition salts and the like. [Selection] Figure 1 |