As the chemical raw materials, melamine is a low toxicity . The result of animal experiments shows that the metabolism of animals is very quickly and the chemical mainly affects the urinary system and will not exist in body.

The amount of melamine exists a clear dose-response relationship between the agent and clinical disease. vivo Maximum tolerated dose of melamine in infants is15 mg per kilogram of powdered milk.

A risk assessment of experts on the milk powder of contaminated infant formula to conduct shows that babies,weight 7 kg , assum a daily intake of 150 grams of milk powder, its security value of the pre-maximum tolerated dose is 15 mg / kg milk.

According to the U.S. Food and Drug Administration standards for melamine ,a tolerable daily intake per day is 0.63 mg / kg bodies' weight.