This specifically processed Chinese rhubarb (Rheum palmatum, R. Officinale) is standardized for a milder laxative effect. It contains anthraquinone glycosides that encourage bowel movement, but the processing cuts the harshness and cramping you might get from the unprocessed root.
For short-term relief of occasional constipation, many people choose this processed version. Those who find standard rhubarb root too strong or unpredictable often prefer it. The effect typically kicks in within 6 to 12 hours, so taking it at bedtime sets up a morning bowel movement.
Do not use it for longer than one week without guidance from a healthcare professional. Overuse can cause dependence, dehydration, and electrolyte imbalances. Stay away from it if you have an intestinal blockage, Crohn's disease, ulcerative colitis, or appendicitis.