Piperic Acid is a metabolite of Piperine. Piperic acid is found in herbs and spices. Piperic acid is obtained from black pepper (Piper nigrum), from Minthostachys verticillata, peppermint (Mentha piperita) and others. Piperic acid is an intermediate in the synthesis of other compounds such as piperonal, and as-such may be used to produce fragrances, perfumes flavorants and drugs as well as other useful compounds. The cytotoxic effects of piperic acid in prostate cancer cells (PC-3) and breast cancer cells (MDA-MB-231) were studied. The drug treatment experiments clearly indicated that maximum cytotoxicity was achieved at 48 hours and at 100uM concentration of piperic acid in both the cell lines. It is proposed that piperine might get metabolized into piperonylic acid, piperic acid, and piperonal in human as evidenced in rats. Hence, the three derivatives of piperine presented above shall be of therapeutic significance. Piperic Acid has revealed Lipoxygenase (LOX) inhibitory activity. The possibility of exploiting the higher LOX inhibitory activity and lower IC50 values of piperine derivatives, piperonal, and piperonylic acid, in various ways for therapeutic applications, especially with fermented herbal drugs containing materials with piperine as a constituent has being suggested.