Marine plasma (Sérum de Quinton)

The scientist who was also a war hero

In 1897, in a physiology laboratory at the Collège de France, René Quinton drained the entire blood volume out of a dog and pumped sterilized seawater, diluted to the salt concentration of blood, in after it. He reported that the animal survived and recovered within five days. From that single experiment he built a career and a product.

Quinton (15 December 1866, Chaumes-en-Brie – 9 July 1925, Paris) was an assistant at the Laboratoire de Physiologie pathologique des Hautes-Études at the Collège de France, where Étienne Jules Marey was his mentor. The address gave his claims the authority of French academic science at its most prestigious institution. Then the 1904 monograph L’eau de mer, milieu organique was followed by something rarer than a laboratory pedigree: WWI service as a reserve artillery captain who rose to colonel, was wounded eight times across more than twenty battlefronts, and received the Légion d’honneur at Chevalier, Officier, and Commandeur levels along with decorations from Belgium, the United Kingdom, and the United States. His public standing fused the credentials of the laboratory scientist with the moral authority of the decorated war hero, and that double authority was what kept the idea of seawater-as-blood credible.

Seawater only his laboratory could make

Commercial production of marine plasma required Quinton’s own processing pipeline: collection of Atlantic seawater from specific deep offshore zones selected for plankton density, cold micro-filtration (without boiling or chemical treatment) to remove microorganisms, dilution to approximately 9 g/L total dissolved salts, and sterile packaging. From 1905 this pipeline ran through Quinton’s own Paris laboratory. He patented the preparation as ‘sérum de Quinton’ in 1907. The marine dispensaries he established from 1906 supplied the preparation free to destitute patients while commercial versions were sold to paying clients. The production process, the collection geography, and the laboratory protocols were proprietary to Quinton and, after his death, to his commercial successors.

The sea in our veins

Quinton argued through a ‘Law of Marine Constancy’ that animal life, having originated in the sea, maintains an internal milieu identical in mineral composition to primordial seawater. The law presented three sub-constancies: marine (ionic composition preserved), osmotic (tonicity preserved), and thermal (temperature preserved). The argument combined genuine observations (blood and seawater share a similar overall salt concentration) with a conceptual leap that modern physiology does not support: seawater and plasma differ in the ratio of ions in ways that matter clinically, and the evolutionary argument for ionic identity is not consistent with the phylogenetics of vertebrate blood composition. The proposed mechanism was at once specific enough to sound like science (it cited chemistry and comparative anatomy) and broad enough to explain any condition involving dehydration, wasting, or cellular weakness.

Selling it and giving it away at once

Quinton held the production and distribution rights to the preparation through the patent of 1907 and the laboratory established in 1905. He derived income from commercial sales while simultaneously operating charitable dispensaries for destitute patients. The free dispensaries and the commercial product shared the same preparation and the same scientific claims, with the free-dispensary operation providing both humanitarian cover and a large clinical case series that Quinton used to document therapeutic success. The conflict between his role as scientific authority on the preparation’s efficacy and his role as commercial producer of that same preparation was not separately disclosed in the clinical accounts of his time.

The license that was taken back

In 1993 the French drug authorization (AMM) for Plasma de Quinton and Duplase de Quinton, granted in 1943, was revoked: the preparations failed to meet modern European regulatory standards and the laboratories could not be adapted (quinton.bio/about-us/laboratory-history, accessed 27 June 2026). Quinton’s therapies were ‘abandoned by medicine’ and removed from the French physicians’ reference (Vidal) after decades on the market. Wikipedia characterizes the scientific views in Quinton’s 1904 book as ‘not valid.’ Harriet Hall, a physician and critic of alternative medicine, wrote of the 1897 dog experiment that the claim does not ‘meet the standards of ordinary peer-reviewed published evidence’ (Wikipedia, René Quinton, accessed 2026-06-27). No randomized controlled trial of marine plasma therapy has been published. The later Quinton-branded oral and spray products are modeled separately from this historical injectable intervention.