The invention concerns the use of phosphatidylserine (PS), lyso-phosphatidylserine or/and a physiologically acceptable salt thereof for the treatment of the attention deficit syndrome (ADHS) in small daily doses over a longer time period and in larger daily doses over a short period as well as in combination with suitable additives selected from the group comprising antioxidants, essential fatty acids, mineral substances, amino acids, mood-lifters or/and phospholipids. In this connection it is preferred to carry out the administration to probands aged 2 to 20 years preferably 3 to 10 years whereby the phosphatidylserine as well as the additives are used in solid and also in liquid formulations. Due to its positive properties phosphatidyl-serine is in particular suitable as a therapeutic agent or food supplement in connection with ADHS. The good tolerance of phosphatidylserine even in high doses and over a longer supplementation period and the excellent compliance should also be stressed.