Yes it is good for evacuating the bowels following treatment for parasites.

As far as I know ricinoleic acid is not found in any other plant.

Ricinoleic acid is effective in preventing the growth of numerous species of viruses, bacteria, yeasts, and molds. It's successful as a treatment for ringworm, keratoses, skin inflammation, abrasions, fungal-infected finger- and toenails, acne, and chronic pruritus. The affected area is wrapped each night in a castor oil-soaked cloth.

Internal use of castor oil can be helpful but it is best to use it in the form of castor oil packs. These improve the function of the thymus gland and other areas of the immune system. Studies have found that people using castor oil packs had significant increases in the production of lymphocytes compared to those using placebo packs. These Lymphocytes cells fight desease and are found in lymphatic tissue such as the thymus gland, spleen, and lymph nodes, as well as the lining of the small intestine (called Peyer's patches).

When castor oil is absorbed through from packs, the lymphocyte count of the blood increases as a result of the oil's positive influence on the thymus gland, lymphatic tissue, or both. The flow of lymph increases throughout the body, speeding up the removal of toxins surrounding the cells and reducing the size of swollen lymph nodes. The end result is a general overall improvement in organ function with a lessening of fatigue and depression.

Additionally, as toxicity is reduced, the pH of the saliva becomes less acidic, signaling improved health, and the Peyer's patches in the small intestines more efficiently absorb fatty acids, which are essential for the formation of hormones and other components necessary for growth and repair.

Best wishes