The Queen's homeopathic pharmacist is selling ground-down fragments of the Berlin Wall to people who believe it will cure asthma and depression.
Ainsworths, which has held a Royal warrant since 1980 and also supplies the Prince of Wales, is charging up to £114 (NZ$216) for a large bottle of tablets leading to warnings that vulnerable patients are being exploited.
The "remedy" is made by grinding down pieces of the Cold War relic and diluting it multiple times with lactose, water and alcohol.
Edzard Ernst, emeritus professor of contemporary medicine at Exeter University, said producers believe the tablets convey a "spiritual force" capable of bringing people together.
Among the claims made online in favour of Berlin Wall are that it treats asthma, headaches, aggression, depression, and insomnia.