Established in 2002, Hunan Flag Bio-Tech is a high-tech enterprise integrating R&D, manufacturing and sales of enzymes and bio-catalytic products, with featured products including reduced and oxidized L-glutathione, S-acetyl-L-glutathione, L-norvaline, D-phenylalanine, D-alanine, D-tryptophan, sialic acid, citicoline, citicoline sodium and alpha-arbutin.

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