nostrum
Definition
A medicine or remedy of unproven effectiveness, often prepared and sold by someone not medically qualified; a questionable solution to a problem.
Español Un medicamento o remedio de efectividad no comprobada, frecuentemente preparado y vendido por alguien sin calificaciones médicas; una solución cuestionable a un problema.
Example
"He claimed his herbal mixture was a cure-all, but it was just another health nostrum."