1,2,3-Tritridecanoyl glycerol is a synthetic triacylglycerol that contains tridecanoic acid in the sn-1, sn-2, and sn-3 positions. It has been used as a standard for the relative quantification of triacylglycerols in C. elegans fat stores. It has also been used as an internal standard for the quantification of triacylglycerols in the serum and liver of adult rat offspring receiving dietary conjugated linoleic acids during and after gestation.