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  1. Cascara Sagrada 
    https://medlineplus.gov/druginfo/natural/773.html
    Cascara sagrada (Frangula purshiana) is a shrub. The dried bark used to be FDA approved as an OTC laxative for constipation. ... of supplements with this effect include aloe, alder buckthorn, gossypol, rhubarb, and senna.
  2. Senna 
    https://medlineplus.gov/druginfo/natural/652.html
    ... Examples of supplements with this effect include aloe, buckthorn, gossypol, and rhubarb.