Marine plasma (Sérum de Quinton)

injection · 1897–1993

category:injection

delivery:Subcutaneous or intravenous injection of filtered, cold-sterilized Atlantic seawater diluted to isotonic concentration (~9 g/L dissolved solids). From 1906 administered at marine dispensaries; also sold commercially as a drinkable preparation and later as topical sprays.

price tier:not classified

era:1897–1993

current status:historical

regulatory:withdrawn

SHORT PITCH (AS SOLD)

Diluted, microfiltered Atlantic seawater maintains the 'original marine milieu' of animal cells; injected isotonically, it can replace blood plasma, reverse fatal dehydration, and cure diseases of wasting and malnutrition.

THE ACTUAL EVIDENCE

No randomized controlled trials of marine plasma therapy exist. Case reports and practitioner accounts from the 1906–1925 dispensary era were published without control groups or blinded outcome assessment. The 1913 American review by Stevens reports Quinton's clinical claims in a favorable register but contains no independent outcome verification. The French AMM for Quinton plasma preparations (Plasma de Quinton and Duplase de Quinton, registered 1943) was revoked in 1993 under modern EU regulatory standards, indicating the evidence base was insufficient by those criteria. The preparations are not listed in current physicians' references (Vidal). Later Quinton-branded oral and spray products are health and hygiene products, not evidence that this licensed injectable intervention continues.

PRACTITIONERS

René Quinton

INGREDIENTS

Filtered Atlantic seawater (Quinton marine plasma)

CASES

quinton-marine-plasma-1897-1925

CLAIMS

All animal cells retain a 'marine milieu' identical in mineral composition to primordial seawater because life originated in the sea; therefore isotonic seawater, filtered and sterilized, constitutes the ideal physiological medium for human cells and can substitute for blood plasma or extracellular fluid. refuted
Subcutaneous or intravenous injections of isotonic seawater ('marine plasma') successfully treated infant enteritis, cholera-type diarrheal illness, and malnutrition, reversing fatal dehydration and wasting in children treated at the marine dispensaries. unreplicated
An animal's entire blood volume can be replaced with sterilized isotonic seawater without fatal outcome, demonstrating that seawater is physiologically equivalent to blood. unreplicated

SOURCES

L'eau de mer, milieu organique (2nd ed., 1912) (1912)
Isotonic Sea Water in Therapeutics (1913)
Laboratory History (quinton.bio) (2026)
René Quinton biography (quinton.bio) (2026)
René Quinton (Wikipedia) (2026)

NOTES

Marine plasma, also called sérum de Quinton or Plasma de Quinton, is the preparation of Atlantic seawater collected from selected offshore deep-water zones, cold-filtered to remove microorganisms, and diluted with distilled water to approximately isotonic concentration (~9 g/L). René Quinton developed and commercialized the preparation from 1905, patented it in 1907, and administered it at free marine dispensaries beginning in 1906. The preparation was theoretically grounded in Quinton’s Law of Marine Constancy, which held that all animal cells retain an internal milieu identical in mineral composition to primordial seawater.

The intervention sits at the boundary between a genuinely functional rehydration agent and an elaborate theoretical superstructure that the underlying chemistry does not support. Isotonic fluid replacement does prevent death from dehydration; whether filtered seawater provides any additional benefit over pharmaceutical saline has not been established in controlled trials. The marine plasma dispensaries operated in an era before randomized trial methodology, when case-report observation was the primary evidence standard.

A later Spanish company acquired rights to the Quinton name and markets seawater-based oral and spray products as health and hygiene products rather than licensed pharmaceutical drugs. Brand and processing claims alone do not establish continuation of the historical injectable intervention, whose modeled era ends with the 1993 loss of authorization.