The testicular-extract protocol reverses the effects of aging in elderly recipients, restoring functional capacities of younger age and extending productive years.
The general rejuvenation-of-the-elderly claim is the marketing-facing extension of the vigor-restoration claim. It moves from the individual self-reported effect Brown-Séquard described in 1889 to a population-level claim about reversal of aging in elderly recipients. The claim is refuted on the same grounds as the underlying vigor-restoration claim (no biologically meaningful dose delivered, reported effects necessarily placebo) and additionally fails the population-level test: Brown-Séquard himself died within five years of his announcement at age 76, without having demonstrated objective rejuvenation; subsequent commercial users showed no documented life extension.
Appears in
Sources
- Effets produits chez l'homme par des injections sous-cutanées d'un liquide retiré des testicules frais de cobaye et de chien — Brown-Séquard, Charles-Édouard. 'Effets produits chez l'homme par des injections sous-cutanées d'un liquide retiré des testicules frais de cobaye et de chien.' *Comptes rendus des séances de la Société de Biologie* (Paris). Communication of 1 June 1889. (English: 'Effects produced in man by subcutaneous injections of a liquid removed from the fresh testicles of guinea-pig and dog.') Specific volume and page numbers vary across modern reviews; the original *Comptes rendus* volumes for 1889 are held in major medical-history libraries and the Société de Biologie archive.