Myths About Theacrine

Theacrine quickly became a fashionable ingredient in pre-workout formulas and "smart" energy drinks. Along with its popularity came plenty of loud promises: no tolerance, no side effects, "better than caffeine." The editorial team checked the most widespread claims against scientific data.

Myth 1: theacrine is the same as caffeine

The first and most widespread myth goes like this: theacrine is just "long caffeine" that acts the same way, only for longer. In reality, these substances are related but not identical. Theacrine (1,3,7,9-tetramethyluric acid) belongs to the purine alkaloids of the methyluric acid group, whereas caffeine is a methylxanthine. The difference of one oxo group and an extra methyl group changes both the pharmacokinetics and the substance's behavior in the body.

In preclinical work by Feduccia and colleagues, theacrine, like caffeine, increased animals' motor activity, and this effect was blocked by substances that act on adenosine and dopamine receptors. So there is indeed a shared point of action. However, the strength and character of the response differed, and in humans the subjective sensations from theacrine are more often described as milder, without a sharp "kick."

Another difference is behavior in the body over time. Caffeine is known for the rapid development of tolerance: regular intake dulls part of its effects within just a few days. For theacrine, the key study by Taylor and colleagues (2016) found no signs of tolerance over eight weeks of daily use, although this is only one controlled trial.

So it is more accurate to put it this way: theacrine is a separate substance with a caffeine-like action, not a "slow version" of it. Expecting an identical effect from it, simply stretched out over time, is a mistake that often leads to disappointment or to an unjustified dose increase.

Myth 2: tolerance never develops

Marketing texts often promise that theacrine "never causes tolerance." The source of this claim is the aforementioned eight-week randomized placebo-controlled study, in which participants received 200 or 300 mg of a patented form of theacrine daily. The authors assessed subjective energy, concentration, fatigue and motivation and saw none of the effect fading typical of caffeine.

At the same time, the wording "never" goes far beyond the data. The sample was small, the duration was two months, and the participants were healthy adults. We do not know how the effect behaves after six months or a year, in people with high daily coffee consumption, or in athletes during intense training blocks.

In addition, tolerance is a multidimensional phenomenon. It may concern mood, cardiovascular responses, sleep, or physical performance, and the dynamics differ for each measure. Theacrine studies primarily measured subjective scales rather than, say, strength or endurance metrics over an extended period.

So the honest wording is this: the available data suggest a lower tendency toward tolerance than with caffeine, but there is no conclusive evidence of an "eternal" effect. In practice this means that stimulant-free periods and a sensible overall load remain a good habit.

Myth 3: natural means safe

The third myth is about safety: "theacrine is found in tea, so it is harmless in any amount." Indeed, the natural source of theacrine is the Chinese teaCamellia assamica var. kucha, whose leaves contain noticeable amounts of this alkaloid. But natural origin in no way guarantees the safety of a concentrated dose in a capsule.

The concentration in a supplement and in a cup of tea are different things. A person who drinks kucha tea gets theacrine together with water, other alkaloids and polyphenols, gradually and in moderate amounts. A capsule delivers the isolated substance all at once, and the body reacts to it differently.

The safety study by Taylor and colleagues found no clinically significant changes in heart rate, blood pressure, blood counts or lipid profile at 200–300 mg per day over eight weeks. This is reassuring, but it concerns healthy young people and a limited period. There is essentially no data on pregnant women or people with cardiac arrhythmias or anxiety disorders.

Interestingly, early animal studies (Xu and colleagues) even described sedative properties of theacrine under certain conditions, meaning the substance's pharmacology is more complex than simple "stimulation." This is another argument in favor of caution with high doses and experiments.

Myth 4: theacrine boosts strength and burns fat

The fourth myth concerns athletic performance: theacrine supposedly "noticeably increases strength and endurance and burns fat." There is little direct evidence of this in humans. Most studies assessed subjective energy, mood and cognitive function rather than physical performance.

Work by Bello and colleagues on high-level soccer players compared theacrine, caffeine and their combination during a simulated match. The authors reported certain benefits of some combinations for cognitive measures, but did not show an unambiguous improvement in endurance from theacrine alone. The study by Kuhman and colleagues using a multi-ingredient supplement makes it impossible to isolate theacrine's contribution at all.

As for "fat burning," the situation is even more modest. Stimulants can slightly increase energy expenditure and reduce the feeling of fatigue, which lets a person train more actively. But there is no convincing clinical data on a direct fat-burning effect of theacrine in humans.

So the realistic expectation is this: theacrine may help you feel more alert and focused, especially for those who tolerate the caffeine "peak" poorly. It is not a substitute for systematic nutrition, training and sleep, and attributing to it the ergogenic power of classic supplements like creatine is incorrect.

Myth 5: it can be combined with caffeine without limits

The last popular myth is that theacrine "combines perfectly with caffeine and does not interact with anything." In fact, the study by He and colleagues showed that simultaneous intake of caffeine changes the pharmacokinetics of theacrine: its blood concentration rose and its elimination slowed. That is, together they do not behave like two independent substances.

The practical conclusion from this is not to mechanically add up doses from different products. A pre-workout formula, an energy drink, coffee and a separate theacrine capsule can together place more load on the cardiovascular and nervous systems than the labels suggest.

A separate topic is sleep. Since theacrine acts longer than caffeine, taking it in the afternoon could theoretically worsen falling asleep in sensitive people. Subjective complaints about sleep appear in reviews, and they should not be ignored, even if formal studies have not shown significant disturbances.

To avoid falling into the trap of myths, the editorial team advises checking a few things:

• whether the label states the exact amount of theacrine and not just a "proprietary blend";
• how much caffeine and other stimulants the product contains overall;
• whether the manufacturer cites real studies rather than general phrases;
• how you personally react to the first, minimal serving.

This approach helps you get real benefit from the supplement without unnecessary risk.

Editorial conclusions

Theacrine is an interesting substance with a caffeine-like action and, according to available data, a lower tendency toward tolerance. But most of the loud promises around it rely on a small number of studies and marketing generalizations.

Realistically, from theacrine one can expect a moderate improvement in subjective energy and concentration. There is not yet enough evidence of a substantial effect on strength, endurance or fat burning in humans.

Safety has been well studied only for healthy adults at the doses used in the studies, and over a limited time span. Combining it with caffeine and other stimulants changes the picture and requires caution.

If the topic interests you, we also recommend reading our materials "Theacrine: What It Is and How It Works," "Side Effects of Theacrine" and "Paraxanthine: What It Is and How It Works."

References

1. Taylor L, Mumford P, Roberts M, et al. Safety of TeaCrine®, a non-habituating form of theacrine: results from a randomized placebo-controlled study. J Int Soc Sports Nutr. 2016;13:2.
2. Feduccia AA, Wang Y, Simms JA, et al. Locomotor activation by theacrine, a purine alkaloid structurally similar to caffeine: involvement of adenosine and dopamine receptors. Pharmacol Biochem Behav. 2012;102(2):241–248.
3. He H, Ma D, Crone LB, et al. Assessment of the drug–drug interactions potential of theacrine and caffeine in humans. J Caffeine Res. 2017;7(3):95–102.
4. Kuhman DJ, Joyner KJ, Bloomer RJ. Cognitive performance and mood following ingestion of a theacrine-containing dietary supplement, caffeine, or placebo by young men and women. Nutrients. 2015;7(11):9618–9632.
5. Bello ML, Walker AJ, McFadden BA, Sanders DJ, Arent SM. The effects of TeaCrine® and caffeine on endurance and cognitive performance during a simulated match in high-level soccer players. J Int Soc Sports Nutr. 2019;16(1):20.
6. Sheng YY, Xiang J, Wang ZS, et al. Theacrine from Camellia kucha and its health beneficial effects. Front Nutr. 2020;7:596823.
7. Xu JK, Kurihara H, Zhao L, Yao XS. Theacrine, a special purine alkaloid with sedative and hypnotic properties from Cammelia assamica var. kucha in mice. J Asian Nat Prod Res. 2007;9(6–8):665–672.