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Chromatographic separation of analytical standard of MK-7 vitamin (blue line), a dietary supplement in the form of an oil capsule—MK-7 dissolved in a vegetable oil (red line), and a dietary supplement in the form of a hard tablet (black line). COSMOSIL cholester column (2.0 mm × 150 mm), with a 3.0 µm grain diameter. Retention time for analysed isomers in min.: I1—19.50; I2—20.71; I3—21.90; I4—22.75; I5—22.94; I6—33.42; I7—35.21; I8—37.60; I9—39.92; I10—41.63; I11—44.62.
