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Theobromine
Theobromine is the principal alkaloid of the cacao plant (Theobroma cacao), a dimethylxanthine and purine derivative structurally related to caffeine and theophylline, of which it is an isomer. It was first discovered in cacao beans in 1841 by A. Woskresensky, with synthesis from xanthine reported in 1882 by Hermann Emil Fischer. It occurs in chocolate, tea, kola nut, and certain hollies, and has been used pharmaceutically as a vasodilator, diuretic, and heart stimulant.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Theobromine peaks in the blood 2-3 hours after ingestion due to its fat solubility, more slowly than caffeine, and its elimination half life is between 6 and 8 hours. At doses of 0.8-1.5 g/day (50-100 g cocoa), sweating, trembling and severe headaches were noted, with limited mood effects found at 250 mg/day.
Duration
Subjective Effects
Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.
Theobromine produces little in the way of a distinct subjective experience at ordinary dietary exposures, acting mainly on the cardiovascular system rather than the central nervous system. Mood effects reported at low intakes are limited, and the compound is not a meaningful stimulant of the human CNS. At substantially higher intakes, the effects that emerge are predominantly physical and uncomfortable rather than perceptual or cognitive.
Physical
The physical profile centres on cardiac stimulation and vasodilation, with sweating, trembling, and severe headaches appearing at higher intakes.
Cardiovascular
Uncomfortable
Pharmacology
Pharmacodynamics
Theobromine acts principally by antagonizing adenosine receptors, with an additional inhibitory effect on cyclic nucleotide phosphodiesterases that is thought to be small and appears only at intakes far above those obtained from a normal diet. Both of these actions are weaker than those of caffeine. In humans it behaves as a mild cardiac stimulant, a diuretic, and a bronchodilator, and it relaxes vascular smooth muscle, while producing no significant stimulant effect on the central nervous system. It may also act on the esophageal sphincter muscle in a way that allows stomach acid to pass into the esophagus.
Pharmacokinetics
Theobromine is only slightly water-soluble and comparatively fat-soluble, and blood levels peak 2 to 3 hours after ingestion, more slowly than caffeine. It is metabolized in the liver into xanthine and subsequently into methyluric acid, with CYP1A2 and CYP2E1 among the important enzymes involved. The elimination half life is between 6 and 8 hours. Theobromine also arises endogenously as a metabolite of caffeine, which the liver converts into roughly 12% theobromine alongside 4% theophylline and 84% paraxanthine.
Interactions
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Harm Potential
History & Culture
Theobromine was first identified in 1841, when the chemist A. Woskresensky isolated it from cacao beans. It is the principal alkaloid of Theobroma cacao, the cacao plant, and gives the cacao bean much of its bitter taste. In 1882, Hermann Emil Fischer reported the first synthesis of theobromine…
Legality
Article Status
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Recent changes7 human edits · latest
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24 January 2026
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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