The work has aimed to analyze the use of bioactive components of plant origin showing antioxidant properties in diet supplements available on the Polish market in the years 2005-2006. It has turned out that extracts or dry powder plants such as Ginkgo (Ginkgo biloba), ginseng (Panax ginseng radix), grapes (Vitis vinifera) seeds, skin and whole fruit, bilberry (Vaccinum myrtillus), grapefruit (Citrus paradisi), soy seeds (Glycine max) and green tea (Camelia sinensis) have been used most often. Antioxidant bioactive substances declared in these plants have been mostly phenolic compounds, especially: flavonoglycosides (ginkgoflavonoglycosides), quercetin, resveratrol and kaempferol, terpene lactones, daidzein, genistein, anthocyanins, lutein and lycopene. The level of a particular plant's processing (extract, dry powder) depended on the diet supplement form which often limited their quantitative additive, both with regard to quantity and flavour.