When exposed to light, trans- resveratrol (RES) dissolved in ethanol is not stable as it isomerises into cis- isomer. In this research, we examined the solubility and stability of trans-RES in oils and its influence on lipid stability. Trans-RES was better soluble in glyceril trioctanoate (TAG) than in sunflower oil (SON). Temperature stability of trans-RES in edible oils was good; in flaxseed oil (LAN) it was preserved for 5 days and in SON at least 10 days upon incubation at 60 °C. In TAG with added methyl-linolenate (M-L) trans-RES was an efficient antioxidant – the solution with only TAG and M-L peroxidised faster. We also examined antioxidant capacity (AOC) of TAG with α-tocopherol (TOKO) and its combination with trans-RES. α-TOKO was better antioxidant, while the synergistic effect between α-TOKO and RES was not observed. Likewise, the synergistic effect among trans-RES and other antioxidants already present in LAN and SON was not observed. Peroxidation rate of oils with or without trans-RES was similar (day 10 – peroxide value; SON and SON with addition of RES – 58, LAN – 310 and LAN with addition of RES – 277). When root peel extract of Fallopia japonica was dissolved in oils and TAG, other antioxidants apart from trans-RES were also dissolved. They significantly contributed to the AOC determined with DPPH radical.