5. Castor oil
Castor oil comes from the castor bean, and the reason it’s not a household oil like coconut or olive is its beans are loaded with the poison ricin, according to the Centers for Disease Control and Prevention. Actually, one single bean has enough ricin to kill over 1,000 people if the purified toxin is injected or inhaled, according to research from the journal Analytical Chemistry. And eating five to 10 of the whole beans would prove to be fatal, too. The oil is used as a food additive and flavoring agent (as well as an ingredient in skincare products, cosmetics, plastics, varnishes, and lubricants), and is void of ricin, so if you wish to buy it, just make sure it was produced adhering to safety guidelines. And stick to The Joint Food and Agriculture Organization and World Health Organization Expert Committee on Food Additives recommended daily castor oil intake (for men) of 0 to 0.7 mg/kg bodyweight.
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