Also known as: Cocoa alkaloid, 3,7-dimethylxanthine, Theobroma cacao, Xanthine
Fat MetabolismGood evidence
The alkaloid that makes dark chocolate mildly stimulating. Gentler and considerably longer-lasting than caffeine, which is why it appears alongside it rather than instead of it.
Typical dose
100.0–500.0 mg per day
With caffeine, earlier in the day; the long half-life affects sleep
What it is
Theobromine is a methylxanthine, the same chemical family as caffeine, found principally in cocoa. Dark chocolate contains substantially more than milk chocolate, and it is the main reason a large piece of very dark chocolate late at night is not entirely inert.
It is also one of the three compounds caffeine breaks down into, alongside paraxanthine and theophylline, so you produce some of it whenever you drink coffee.
Its name has nothing to do with bromine. It comes from Theobroma, the cocoa genus, which translates as food of the gods.
How it works
Theobromine antagonises adenosine receptors as caffeine does, but with considerably lower potency. The result is a milder, less abrupt version of the same effect.
Its half-life is longer than caffeine's, which is the more practically useful difference. Where caffeine peaks and falls, theobromine produces a flatter, more sustained curve, which is why combining them smooths the overall experience.
It also relaxes vascular smooth muscle more than caffeine does, producing mild vasodilation, and has a mild diuretic effect. That vasodilation is the opposite of caffeine's slight vasoconstriction, which is a further reason the pairing works.
What the evidence shows
Trials have reported mild improvements in mood and alertness, generally smaller than caffeine at comparable doses, which is consistent with the lower receptor potency.
Research on blood pressure and vascular function has been reasonably favourable, with reported improvements in vessel dilation, fitting the mechanism.
Evidence for theobromine alone as a fat loss agent is weak. Its place in thermogenic products rests on modifying the caffeine experience rather than on doing much independently, and that is a fair description of what it contributes.
Dosing
Typical supplemental range is 100 to 500 mg. In combination products it usually sits at 100 to 200 mg alongside caffeine.
Because the half-life is long, taking it late in the day can affect sleep even though the felt effect is mild. Treat it with the same timing caution as caffeine rather than assuming gentler means shorter.
As a standalone it is underwhelming. Its value is in smoothing and extending a caffeine dose, and that is how it should be judged when you see it on a label.
At a glance
Common forms
Theobromine powder, Cocoa extract, Within pre-workout and thermogenic blends, Dark chocolate
Half-life / duration
Notably longer than caffeine, in the region of 7-10 hours
Timing
With caffeine, earlier in the day; the long half-life affects sleep
Competition status
Permitted — not on the WADA Prohibited List
Category
Fat Metabolism
Safety and side effects
Theobromine is well tolerated at typical doses and has extensive dietary exposure through cocoa. Reported effects include headache, nausea and, at higher doses, restlessness and disturbed sleep.
It has a mild diuretic effect, so fluid intake is worth attention if you take it alongside training in heat.
One practical warning that belongs on any product: theobromine is the compound that makes chocolate dangerous to dogs and cats, which clear it far more slowly than people do. A tub of theobromine powder or a bag of cocoa-based supplement left within reach of a pet is a genuine hazard.
Who should avoid it
Keep well out of reach of pets — theobromine is the compound that makes chocolate dangerous to dogs and cats. Speak to your doctor before use if your heart rhythm or blood pressure is being managed, or if you take regular medication. Take earlier in the day given the long half-life. Count any accompanying caffeine toward your daily total.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
