Rhubarb contains toxic Oxalates and anthraquinone glycoside.
大黄含有毒草酸以及蒽醌苷。

The good: Rhubarb is used in deserts, has laxative properties, contains tons of vitamins and minerals, and is low in calories. It's also easy to grow at home.
益处：大黄被用于制作药材，有通便秘的功效，其含有大量的维生素和矿物质，所含的卡路里较少。而且也很容易在室内生长。

The bad: Oxalates in the rhubarb leaves makes them highly toxic. Another leaf-dwelling toxin is anthraquinone glycoside.
Try mixing the leaves with soda and water to see how corrosive these acids can be. But freezing rhubarb -- which is a common storage method -- can cause the toxins to sink to the stalks, resulting in contamination.
坏处：大黄的草酸中含有高浓度的有毒物质，另一种有毒物质是蒽醌苷。试着将其叶子与苏打水相混合所产生的酸具有强烈的腐蚀性。人们一般会把食物冷藏，但是这样做有毒物质就流入到了茎部，从而产生致命的化学作用。