September 2, 2026 · Tags: food-science, biotechnology, regulation, cellular-agriculture
The idea of growing meat in a lab instead of raising and slaughtering animals for it has been around for decades in science fiction. Over the last three years, it crossed from research labs into actual restaurants. In 2023, UPSIDE Foods and GOOD Meat started selling cell-cultivated chicken in San Francisco and Washington DC. As of 2026, five companies have cleared FDA pre-market review in the US. Here's how the process works and how regulators oversee it.
Step 1: Take a Biopsy, Not a Life #
It starts with a small tissue sample taken from a living animal under anesthesia. Scientists isolate stem cells from that sample — usually muscle satellite cells (which form muscle fibers) or mesenchymal stem cells (which can become fat or connective tissue). A single biopsy can theoretically produce enough cells to make tons of meat, because these cells can keep dividing.
The distinction matters: this isn't plant-based meat (like Beyond Meat or Impossible). Cultivated meat is real animal tissue, just grown outside the animal.
Step 2: Scale-Up in Bioreactors #
The cells go into stainless steel tanks called bioreactors, filled with a nutrient broth of amino acids, vitamins, and growth factors. They start small (125 mL shake flasks), then step up through wave bioreactors to stirred-tank reactors as large as 20,000 to 25,000 liters.
This is where the hard engineering problems live. At industrial scale, keeping oxygen and nutrients evenly distributed across thousands of liters while avoiding shear forces that damage cells is genuinely difficult. A 2026 study in Frontiers in Nutrition modeled the entire process and identified media preparation, sterilization, and cooling demand as the major bottlenecks for scale-up. A 20,000 L batch takes about 30 days and yields roughly 2,000 kg of biomass.
Step 3: Turn Cells Into Meat #
Once there are enough cells, the culture medium recipe changes. That shift signals the stem cells to differentiate: muscle satellite cells become myotubes (the building blocks of muscle fiber), while other cell lines become fat or connective tissue. That differentiation is what creates meat's flavor and texture.
For simpler products like nuggets or burger patties, the harvested biomass is processed directly. For whole cuts (steaks, fillets), cells need to be organized on edible scaffolds made from plant proteins, collagen, or polysaccharides. Some companies use 3D bioprinting to build structured tissue layer by layer.
The Cost Problem Nobody Has Solved Yet #
Cultivated meat is still expensive. Growth factors (the signaling proteins that tell cells to multiply) are the biggest cost driver. Early production relied on fetal bovine serum, which comes from slaughterhouse byproducts (ethically problematic and expensive). Companies are moving to recombinant growth factors and plant-based hydrolysates, but conventional meat is still a lot cheaper.
Research from the Annual Reviews series notes that even with optimized bioreactor designs, maintaining consistent cell growth across large volumes and preventing senescence (cells aging out) are hard problems nobody has fully solved yet.
The Two-Agency Regulatory Handoff #
In the US, cell-cultivated meat is regulated under a joint framework between the FDA and USDA-FSIS, formalized in 2019.
The FDA handles everything before harvest: cell collection, cell banking, growth, and differentiation. Companies go through a voluntary pre-market consultation, submitting safety data. If the FDA is satisfied, it issues a "no questions" letter.
At the point of harvest (when cells come out of the bioreactor to be processed into food), jurisdiction transfers to USDA-FSIS. The agency inspects facilities, requires HACCP plans, and must pre-approve all labels. Products need a USDA Grant of Inspection and carry a mark of inspection.
Five companies have completed the FDA phase as of October 2025: UPSIDE Foods, GOOD Meat, Mission Barns, Wildtype, and Believer Meats. Four have also received USDA approval.
On the state level, it gets messy. Seven states (Alabama, Arkansas, Kentucky, Louisiana, Mississippi, Montana, South Carolina) have banned or restricted cell-cultivated products entirely. Eighteen states have labeling laws requiring terms like "cell-cultivated" or "lab-grown" on packaging. A federal bill that would have standardized labeling (the Fair Labels Act of 2024) failed to pass.
The Global Picture #
Singapore was first, approving GOOD Meat's chicken in 2020. Israel approved a cell-based beef product in January 2024, with religious authorities ruling it kosher. The EU classifies these as novel foods requiring EFSA assessment (none approved as of 2026). And no country is currently eligible to export cell-cultivated meat to the US.
Why This Matters #
Cultivated meat represents a genuine technological shift in how we produce animal protein — not a substitute or an imitation, but actual meat grown from cells. The environmental case is still debated (energy requirements are significant, and the CO2 footprint depends heavily on the energy mix), but the potential to decouple meat production from industrial animal agriculture is real. Whether the economics work out and the state-level politics don't kill it first will determine if this stays a novelty or becomes something you can buy at the grocery store.