Composition: honey and rhubarb The word "rhubarb" comes from the Latin rhabarbarum, which means "barbary root". activity, vitamin C, which normalizes cholesterol levels in the blood, and various acids (malic acid, oxalic acid, citric acid, etc.), which stimulate metabolism. Rhubarb is not only a valuable source of vitamins, but also an effective tool in the fight against excess weight.