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Risun Bio-Tech Inc is one of the leading flax seed extract manufacturers and suppliers, welcome to buy factory supply pure natural and 100% natural flax seed extract of both low price and high quality.                         Lignans are one of the two major classes of phytoestrogens; the other class is the isoflavones. Plant lignans are polyphenolic substances derived from phenylalanine via dimerization of substituted cinnamic alcohols. Mammalian lignans are lignans derived from plant lignans. For example, following ingestion, SDG is converted to the aglycone secoisolariciresinol, which is