Castor oil is made from the seeds of castor plants. The seeds are not suitable for human consumption as they contain toxic ricin. The beans are harvested and processed to make castor oil which is used in various health remedies.
The main allergen in castor bean allergy is called Ric c 1. This is a 2S albumin protein. This group of proteins are involved in seed storage.
Casrtor Bean allergy is not currently associated with any allergic syndromes.
Other food containing 2S albumin seed storage proteins are cashews, peanuts, brazil nuts, mustard seed, rapeseed, turnip, chickpeas, hazelnuts, pistachio, buckwheat, soya, sunflower seeds, walnuts, kiwi, castor beans and sesame seeds.