Ghezzi P, Garattini S, Caccia S, Salmona M, Zanini M G
Toxicol Lett. 1983 Feb;15(2-3):123-9. doi: 10.1016/0378-4274(83)90205-9.
Plasma levels of pyroglutamic (PY) and glutamic (GA) acids have been measured after oral administration of monosodium glutamate (MSG) to 6 human volunteers. MSG (43 mg/kg) was administered either after an overnight fast or immediately after a normal meal. In fasting subjects plasma GA peak levels were about 2.3 times the basal levels whereas the increase in plasma PY levels were only 1.5-fold. When MSG was administered with a meal plasma GA levels were raised, to a lesser extent, while no increase could be observed in plasma PY.