This study explores the potential of polyamines and their acylated derivatives as antioxidants in plant oils and emulsions. We have shown that linseed, rapeseed, sunflower, and soybean oils naturally contain spermidine and spermine (SPM). These polyamines added to methyl linolenate effectively prevent lipid oxidation in the absence of other antioxidants. However, they showed no activity in in vitro antioxidant assays (DPPH, ABTS, Folin-Ciocalteu) and did not express Fe