The source of this remedy is barium carbonate which, in large amounts, causes nausea, vomiting, convulsions, and diarrhoea.
Baryta carb. is most effective in the very young and the very old. Children who benefit from it are mentally and physically slow, very skinny for their age, and pot-bellied; they also tend to have wrinkled skin and a vacant expression on their face. Elderly people who respond well tend to be obese. Both groups may also suffer from hormone problems.