Castor seed, though, very scarce, is the source of castor oil, which has a wide variety of uses. Theseeds contain between 40% and 60% oil that is rich in triglycerides, mainly ricinolein. The seed also contains ricin, a water-soluble is also present in lower concentrations throughout the plant. We have it in large quantity. us today for your order. You can also visit our website for more information on how you can get our product sample.