Wang Jiangnan is the seed of leguminous plant Wang Jiangnan. Oval flat, slightly pointed at one end, 3-4 mm in diameter, flat, with oblique black striped umbilicus at the top. Dark green on both sides, with brown oval spots in the middle, and hard texture. Delicious and rich in mucus.

Indications: clearing liver, improving eyesight, invigorating stomach, relaxing bowels, and detoxicating. Treat dysentery after frying seeds.

I suggest you go to Taobao (Anguo Store of TCM Health House) and you can definitely buy it.