This is the downstream policy claim Carrel developed in Man the Unknown (1935), linking his tissue culture findings to a eugenic program. Having argued that cells are intrinsically immortal and that aging stems from the body’s internal fluid environment, Carrel proposed that maintaining the biological quality of the human race through selective breeding and the elimination of individuals deemed biologically harmful would preserve the conditions for maximum cellular and organismal vitality.

The claim is a surrogate argument: the cultural and biological improvement of the population is proposed as a surrogate for the demonstrated lifespan extension of tissues in vitro. No hard endpoint was specified. The euthanasia proposals in Man the Unknown — including institutions for the disposal of the most dangerous criminals — were advanced under this framework (Vernon 2019, PMID 31249090, which characterizes these proposals from the book).

The factual basis for this entire argument was removed by Witkowski’s demonstration (1980, PMID 6990125) that the immortal culture almost certainly reflected cellular contamination from the nutrient extract rather than genuine cellular immortality; and by the Hayflick limit (Hayflick & Moorhead 1961, PMID 13905658; Hayflick 1965, PMID 14315085), which established that normal cell mortality is intrinsic, not environmental.