Ricin only lethal in combination with sugar
(PHYSorg.com Biology)

The plant toxin ricin is one of the most poisonous naturally occurring proteins, making it an extremely dangerous bioweapon. Ricin attacks have made headlines a number of times over the years, including the spectacular `umbrella murder` in London in the 1970s, or the ricin letters addressed to Barack Obama in 2014. There is no antidote.