When you search for the best α-ketoglutaric acid companies in 2025, you will find names like Xinggao Chemical, Kyowa Hakko Kirin, Sigma-Aldrich, BASF, Thermo Fisher Scientific, Merck KGaA, Fujifilm Wako Chemicals, Spectrum Chemical, Actylis, Santa Cruz Biotechnology, Klaire Labs, TNJ Chemical Industry, and Evonik Industries AG.