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===''Propionibacterium ''===
One study reported elevated levels of vitamin B12 produced in a two-stage fermentation first with ''Propionibacterium freudenreichii'' and then ''Saccharomyces'' yeast. The reported beers were reportedly not significantly different in the sensory profiles of the beers <ref>[https://www.sciencedirect.com/science/article/pii/S2212429224022387 Iida Loivamaa, Maija Greis, Vertti Nikander, Minnamari Edelmann, Marjo Pöysä, Pekka Varmanen, Per E.J. Saris. Two-step fermentation to produce vitamin B12 containing beer using Propionibacterium freudenreichii and yeast. Food Bioscience, Volume 63, 2025, 105807, ISSN 2212-4292. https://doi.org/10.1016/j.fbio.2024.105807.]</ref>.
===''Weisella''===