Taken from Wikipedia.........sissy how come your still alive? Guess maybe it take a lot to kill ya
Toxicity
Rhubarb flower
Rhubarb leaves contain poisonous substances, including oxalic acid which is a nephrotoxic and corrosive acid that is present in many plants. The LD50 (median lethal dose) for pure oxalic acid in rats is about 375 mg/kg body weight,[17] or about 25 grams for a 65 kg (~140 lb) human. While the oxalic acid content of rhubarb leaves can vary, a typical value is about 0.5%,[18] so a rather unlikely 5 kg of the extremely sour leaves would have to be consumed to reach an LD50 of oxalic acid. Cooking the leaves with soda can make them more poisonous by producing soluble oxalates.[19] However, the leaves are believed to also contain an additional, unidentified toxin,[20] which might be an anthraquinone glycoside (also known as senna glycosides).[21]
In the petioles, the amount of oxalic acid is much lower, only about 2-2.5% of the total acidity which is dominated by malic acid.[22] This means that the raw stalks may not be hazardous, though they are generally thought to be in the US. The tart taste of raw stalks is so strong as to be unpalatable to many.