It reigns in commercials as a powerful, supergiant boost of energy. It has found a comfortable domain in oversaturated, sugary, carbonated drinks; robust, flavorful espressos; hot, blackened teas; and bittersweet chocolate delights. Connoisseurs seek out its quantity rather than its taste, hoping to satisfy their body with its encompassing jittery surge. Its name alone is controversial and, with the uttering of its two syllables, it…