Alexander Baranov, the president of the National Association for Genetic Safety, said it had checked 10 kinds of sausages from Perekrestok supermarkets in Moscow and discovered carrageenan, which use is prohibited in baby food, in five.
Scientists have suggested that degraded carrageenan could lead to gastric ulcers and even cancer.
"Concealing information about food components represents a direct threat to people's health, which may lead to serious consequences," said Leonid Ben, the head of the association's legal department.
He also said genetically modified soy had been found in another sort of sausage, which was a serious violation of the law on consumers' rights.
Baranov also said 20% of children currently suffered from food allergies but the figure could grow to 50% in 2015.