Assertion: caffeine | /r/AtLocation | certain foods
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Historically, caffeine has been added to certain foods, beverages, dietary supplements, and medications; however, coffee and tea, in that order, are the primary sources of caffeine in the diet of the US population.1 Caffeine‐containing products may be classified as either conventional foods or dietary supplements.