Aethusa cynapium, also known as fool's parsley, is an annual herb native to Europe, western Asia, and northwest Africa. It affects the brain and nervous system and is connected to gastrointestinal disturbances. It is considered a remedy for childhood, particularly for babies who cannot tolerate milk, and causes symptoms like weakness, inability to think clearly, confusion, anxiety, and violent vomiting or convulsions. Key indications include intolerance of milk, lack of thirst, herpetic eruptions on the nose, and symptoms made worse by warmth, milk, dentition, exertion, vomiting, or stool. It is used to treat teething issues in children and compares to remedies like Cicuta, Conium,