The seems PS dosage in Lecithine seems very low. As an example:
Phospholipids | Soja Lecithin Granulat für Gehirn und Körper
Inhaltsstoffe pro 100 g
Soja-Lecithin davon: 95 g
Phosphatidylcholine 31.3 g
Phosphatidylinositol 15.9 g
Phosphatidylethanolamine 13.4 g
Phosphatidylserine 0.38 g
α-Glycerylphosphorylcholine 0.76 g
L-Tyrosin 5.0 g