a remedy for all ills, a cure-all.
An agent good for what ails you, or what doesn't ail you. A "cure-all".
A remedy for all diseases.
The panacea (IPA ), named after the Greek goddess of healing, Panacea, was supposed to be a remedy that would cure all diseases and prolong life indefinitely. It was sought by the alchemists as a connection to the elixir of life and the philosopher's stone, a mythical substance which would enable the transmutation of common metals into gold.
In Greek mythology, Panaceia, or Πανάκεια (Latin Panacea), was the goddess of healing. She was the daughter of Asclepius, god of healing and medicine, and the granddaughter of Apollo, god of healing. as Panacea was the goddess of healing and cures (see etymology), Iaso was the goddess of recovery, and Hygeia was the goddess of welfare and prevention of disease.