Every promising cell therapy faces the same unglamorous obstacle: you need a lot of cells. Not thousands, not millions, but billions, and they all need to be healthy, identical, and behave exactly like the original. Induced pluripotent stem cells, or iPSCs, are one of the most important tools we have. These are adult cells reprogrammed to act like embryonic stem cells, meaning they can turn into almost any cell type in the body. That makes them incredibly useful across cell therapy, tissue engineering, and even cultivated meat. The challenge has never been what they can do. It’s how to produce enough of them, consistently and affordably, for any of this to scale.
Six billion cells, without flooding the system
The conventional approach to growing iPSCs involves flooding cultures with expensive growth-signaling proteins and changing the media frequently to prevent nutrient collapse. Defined Bioscience took a different angle. Their patent (WO2026050606A1) describes a chemically defined, animal-free culture medium called S8 that supports iPSC expansion at densities exceeding 6 billion cells per liter, while maintaining over 95% viability and strong pluripotency marker retention.
Instead of relying on high concentrations of growth factors, the formulation uses very small amounts of key signaling molecules. Neuregulin-1 helps drive survival and proliferation, while TGF-β3 helps cells maintain their stem-cell identity rather than drifting into differentiation. Both are used at deliberately low concentrations, just a few nanograms per milliliter. Cells are grown in a scaffold-free liquid suspension, meaning they float freely rather than attaching to a surface. Media changes are minimal, sometimes only every two days.
The result is not just higher output, but more efficient use of inputs. Compared to leading commercial media, the patent reports at least three times more usable cells per liter. Put into something more tangible, that works out to roughly 1.4 billion viable stem cells in a single coffee cup.
Designed for scalable, repeatable cell production
Defined Bioscience has spent several years developing chemically defined, animal-free reagents specifically for stem cell research and cellular agriculture. Their earlier HiDef-B8 medium established credibility across academic and industrial iPSC labs. This patent extends that work into the territory that matters most commercially: scalable, suspension-based expansion at densities that make clinical and food-tech applications genuinely viable. For a company whose entire focus is on making cell culture more affordable and reproducible, S8 is a direct expression of that mission rather than a detour from it.
Congratulations and a warm thank you to the inventors: Steven D. Rees, Jerome V. Karpiak, and Gerardo Aguirre Castillo, for advancing the practical science of stem cell expansion in a way that could quietly shape how cell therapies and cultivated products are manufactured for years to come.
Lab Grown Technologies highlights meaningful innovations shaping the future of cellular agriculture and tissue engineering.
Join the conversation and share your thoughts on LinkedIn: linkedin.com/company/lab-grown-technologies/
About the Author
I’m Kandice Vincent, a writer and editor covering cellular agriculture, food tech, and the future of how we produce and consume food. I work closely with founders, researchers, and mission-driven companies to turn complex science into something people can actually understand. I care deeply about where food is headed, how we get there, and who’s shaping that future. Based in Mexico, I’m usually writing with my rescue dog Taco nearby, who remains unimpressed by patents but highly invested in mealtimes.
This post is based on publicly available information and reflects an independent interpretation. Lab Grown Technologies is not affiliated with the inventors or organizations mentioned.
Work with Lab Grown Technologies
We help teams present their technology and make it visible to a highly engaged, targeted audience in food and biotech, capturing interest from people and organizations that may benefit from your solution.