Rubidium: The typical daily dietary intake of rubidium is 1 to 5
mg. Foods high in rubidium include coffee, black tea, fruits, vegetables
(especially asparagus), poultry and fish. Rubidium is a relatively
nontoxic element and has not show to be of toxicological concern from the
nutritional point of view. Rubidium deficiency apparently depresses growth
and life expectancy in goats.