Rubidium is an ultra-trace mineral used by humans which has been shown to have an antidepressant effect.
Here is the rubidium content of a couple of foods from a 1995 paper which analyzed 137 foods for their rubidium content.
Coffee contains 40 mg of rubidium per kilogram (2.2 pounds) dry material.
Black tea contains 100 mg of rubidium per kilogram (2.2 pounds) dry material.
Eight-five percent (85%) of the rubidium pass into these beverages.
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