Szechuan Peppercorn Worst Irritant No known benefits Szechuan Peppercorn description From a plant native to Szechuan Province in China. It grows on trees, and so differs from black pepper, which grows on climbing vines. Used extensively in Szechuan cooking, Szechuan pepper is known for the “numbing” sensation it produces on the tongue. Related ingredients: Black Pepper Extract And Oil Zanthoxylum Bungeanum Fruit Oil