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Commonly discussed for Focus13
Clear filtersAttention, mental clarity, and staying on task.
Black teaDrinkAn oxidized tea brewed from Camellia sinensis. Contains caffeine and the polyphenol theaflavins.
CoffeeDrinkA brewed beverage from roasted coffee beans. Contains caffeine and the polyphenol chlorogenic acid.
ColaDrinkA sweetened carbonated soft drink flavored in the cola style, carrying added caffeine and sugars.
Coffee steeped cold or served over ice, made from cold-brewed or chilled brewed coffee; a source of caffeine, chlorogenic acid, and plant polyphenols.
Energy drinkDrinkA sweetened carbonated drink formulated with caffeine and typically taurine and added B vitamins; a source of caffeine, sugars, taurine, and B vitamins such as niacin, vitamin B6, and vitamin B12.
EspressoDrinkA concentrated coffee brewed by forcing hot water through finely ground coffee under pressure; a source of caffeine, chlorogenic acid, and plant polyphenols.
Green teaDrinkAn unoxidized tea from Camellia sinensis. Contains caffeine, the amino acid L-theanine, and catechin polyphenols such as EGCG.
GuaranáDrinkGuaraná (Paullinia cupana), an Amazonian seed used as a powder and as the base of Brazilian sodas, energy drinks, and supplements; the seed is naturally rich in caffeine (historically called guaranine) along with theobromine and polyphenols.
Instant coffeeDrinkCoffee prepared from dried, dissolvable coffee granules stirred into hot water; a source of caffeine, chlorogenic acid, and plant polyphenols.
Oolong teaDrinkA partially oxidized Chinese tea between green and black in style; it carries catechins, polyphenols, caffeine, and the amino acid theanine.
White teaDrinkA minimally processed tea made from young leaves and buds, with a delicate flavor; it carries catechins, polyphenols, caffeine, and theanine.
Yerba mateDrinkA steeped infusion of dried holly leaves traditional to southern South America; a source of caffeine, chlorogenic acid, theobromine, and plant polyphenols.