AuX Labs announced a $4 million funding round to develop dairy-free casein that mimics the melt and stretch of traditional cheese. The startup claims its bioreactor process can tap the excess fermenter capacity of microbreweries, offering a new revenue stream for those struggling post-COVID. Microbreweries in the United States grew to nearly 10,000 in recent decades, but the pandemic has reduced alcohol consumption, leaving many facilities with idle equipment. AuX Labs sees this as an opportunity to convert brewing fermenters into protein-production units, a partnership that benefits both parties. The round was led by NYA Ventures and Nàdarra Ventures , with participation from Bluestein Ventures , Builders VC , Congruent Ventures and Verdex Capital . The cheese market is valued at roughly $165 billion, and casein is a key stabilizer in many food products. AuX Labs estimates that dairy-free casein would require significantly less land and water and could cut greenhouse gas emissions by about 90% compared to conventional dairy production. Co-founder and CEO Ted Jin said the company's goal is to deliver a product that "melt and stretch are non-negotiables." He added that the "excess capacity" in breweries is an untapped resource, and that the challenge is "how to use that capacity." Jin also noted that the resulting casein would be "biologically identical to the one found from animal protein," and that the company plans to sell kits that allow breweries to operate independently. He concluded, "Maybe it sounds corny, but I just want to build a better food system for my kids." Looking ahead, AuX Labs aims to expand beyond cheese, potentially offering its platform for other protein-based foods. If successful, the model could provide a scalable, low-impact alternative to traditional dairy, aligning with broader sustainability goals in the food and energy sectors.