Theobromine

What is theobromine?

Theobromine is a natural compound in the methylxanthine family, the same chemical group as caffeine and theophylline. It is the main alkaloid in cocoa beans and is found in dark chocolate, cocoa powder and, in smaller amounts, tea and guarana. Despite its name, it contains no bromine; the name comes from Theobroma, the cocoa tree’s genus. Theobromine is a milder stimulant than caffeine. It relaxes smooth muscle, widens blood vessels and has a mild diuretic effect. The body also produces some theobromine when it breaks down caffeine.

What the research says

Research on theobromine has focused on cocoa, mood, alertness and blood pressure, rather than on blood sugar. A randomized, double-blind crossover trial published in Hypertension in 2010 compared cocoa with natural levels of theobromine, cocoa enriched with high-dose theobromine, and placebo. Natural-dose theobromine cocoa did not significantly change 24-hour ambulatory or central systolic blood pressure. The theobromine-enriched cocoa lowered central systolic pressure, but it raised 24-hour ambulatory systolic blood pressure, the measure most closely tied to day-to-day readings.

There is no good human evidence that theobromine supplements improve blood sugar, insulin sensitivity or weight. Some laboratory and animal studies have explored metabolic effects, but these have not been confirmed in people. Its role in multi-ingredient formulas is most likely to provide a gentle sense of energy, similar to a small amount of caffeine.

How it’s used in supplements

Theobromine is used in energy, focus and pre-workout products, in some weight loss formulas, and as a cocoa extract. It is usually listed in proprietary blends, so the dose is often unknown. At food-level amounts it is well tolerated. Higher amounts can cause restlessness, trouble sleeping, nausea, headache, a faster heartbeat, increased urination and a rise in blood pressure, and the effects may add to those of caffeine, theacrine and green tea. People with high blood pressure, heart rhythm problems, anxiety or acid reflux, pregnant or breastfeeding women, and those who take stimulant medicines or theophylline should ask a doctor before using products with added theobromine. Products that contain theobromine should not be described as stimulant-free.

One more practical note: theobromine is highly toxic to dogs and cats, which clear it slowly. Keep any supplement or cocoa product that contains it well out of reach of pets.

For shoppers, the key point is transparency. When theobromine is buried in a proprietary blend, you cannot tell how much you are getting or how it adds to your daily caffeine from coffee, tea, soda and chocolate. If you are sensitive to stimulants, choose products that state the amount.