With an equivalent arginine base furniture, arginine chlorhydrate (CA) and arginine aspartate (AA) are orally administered, with variable doses, to normal fasting children, to study during 4 hours evolution of plasmatic growth hormone rates (stimulation of endogenous GH secretion) and plasmatic free fatty acids rates (secondary effects on effectors). With CA 5 g (half dose) opr 10 g (total dose, about 500 mg/kg) mean plasmatic GH rates increase is etale and non significant, when compared to normals. With AA 7,35 g (half dose) or 14,70 g (total dose), there is a 2 h GH peak, when compared to initial values and 2 h normal values (p less than 0,05 or p less than 0.01). Area increases with the two doses AA, when compared to normals (p less than 0,01). With the two products, mean 1 h plasmatic FFA rate does not vary or non significantly decreases. 4 h rate increases, when compared to normals, with CA and AA half dose (p less than 0,05) and CA and AA total dose (p less than 0,01).