Theobromine Facts

Theobromine (3,7-dimethylxanthine) is a stimulant of the methylxanthine class. It blocks adenosine receptors in the brain — the signaling system that promotes sleep — producing mild stimulation.

Subjective effects include mild vasodilation, slight warmth, increased urination, and a subtle decrease in the sense of calm. The experience is defined by its near-absence — at the highest dose studied in isolation, no measurable change in alertness or mental performance was detected.^[1]

Theobromine produces no documented physical dependence and no human fatality has been attributed to it alone. Adverse effects increase above 850 mg/day;^[2] the primary risk at high sustained doses is metabolic and cardiovascular rather than acute poisoning.