Description: Silymarin Milk Thistle Extract 150 mg 120 Vcaps - Silymarin ( Silybum marianum ), also known as Milk Thistle, is an herb that is well-documented in early traditional herbal practices. Studies abroad and in the US have indicated that constituents in silymarin may help support healthy liver function. NOW Foods Silymarin delivers 300 mg of milk thistle extract per serving, standardized to 80% Silymarin flavonoids, along with 700 mg of turmeric for synergistic support.