At 12 Rue Claude-Bernard, they would later sell "Extrait Organique",... based on extracts of testicles to keep you younger. It was the result of the (incorrect) research of Charles-édouard Brown-Séquard at the Collège de France. He believed that ground animal testicles would keep him young, because he was convinced that aging was caused by a diminished function of the testicles.
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