What to Combine Theacrine With

Theacrine is rarely taken on its own: for the most part it is included in pre-workout formulas and energy drinks alongside other substances. The editorial team analyzed which combinations have a scientific basis, which are only theoretically logical, and which are best avoided.

Basic principles of combining

Before putting together any combination, it is worth remembering that theacrine is a central nervous system stimulant with a mechanism related to caffeine. Preclinical data link its action to adenosine and dopamine receptors. This means that any combination with other substances of the same class sums up the load rather than simply "adding energy."

The second principle is to assess not individual capsules but the total daily picture. Coffee, tea, energy drinks, pre-workout formulas, fat burners — each of these may contain stimulants. A person can easily get several hundred milligrams of caffeine on top of theacrine without even noticing it.

The third principle is to combine substances with different, complementary mechanisms. A stimulant is responsible for alertness and the feeling of energy, while, say, creatine or beta-alanine are responsible for energy metabolism and the muscles' buffering systems. Such pairs do not compete with each other and do not amplify the same side effects.

And finally, it is wise to introduce any new combination gradually: first each component separately, then together, in minimal servings. This makes it easier to understand exactly what caused a positive effect or discomfort.

Theacrine and caffeine

The most studied pair is theacrine and caffeine. This is precisely the combination most often seen in pre-workout formulas: caffeine gives a quick start, while theacrine, by the manufacturers' design, "prolongs" the feeling of alertness and smooths out the crash.

The study by He and colleagues showed that caffeine increases the blood concentration of theacrine and slows its elimination. On the one hand, this explains why the combination may feel stronger. On the other, it is a direct argument against simply adding up doses: together the substances act more intensely than each one separately.

In the study by Bello and colleagues on soccer players, the combination of theacrine with caffeine during a simulated match provided certain cognitive advantages in some tests compared to placebo. However, the results are inconsistent, and a conclusion about "synergy" for physical performance is still premature.

For caffeine, the International Society of Sports Nutrition (ISSN) considers doses of about 3–6 mg per kilogram of body weight 30–60 minutes before exercise to be effective. If caffeine is combined with theacrine, it is reasonable to move toward the lower end of this range and not exceed the overall safe daily amount of caffeine for healthy adults — about 400 mg, according to EFSA's estimate.

Theacrine and L-theanine

For those who want energy without jitteriness, combining theacrine with L-theanine — an amino acid from green tea — looks logical. For caffeine such a pair is well studied: in the study by Owen and colleagues, L-theanine together with caffeine improved the speed and accuracy of performing complex cognitive tasks and reduced the subjective "overload" from stimulation.

It should be honestly noted that there are practically no direct controlled studies of the "theacrine + L-theanine" pair in humans. The logic of the combination is built on mechanism: theanine affects the brain's alpha rhythm and the subjective feeling of calm focus, while theacrine provides moderate stimulation.

In practice, L-theanine is most often used in amounts of 100–200 mg, often in a ratio of roughly 2:1 to caffeine. For theacrine no such "golden" ratio has been established, so it is worth starting with minimal servings and going by how you feel.

Such a combination is especially appropriate for mental work, studying or tactical sports, where concentration and calm matter more than a sharp rush of energy. For explosive strength training its advantages are less obvious.

Conflict-free sports supplements

The safest category of combinations is supplements that work at the level of muscle metabolism rather than the nervous system. Creatine monohydrate, according to the ISSN position, is one of the most evidence-based supplements for strength and power, and there is nothing in its mechanism that would conflict with a stimulant.

Beta-alanine increases carnosine content in muscles and helps with loads lasting roughly one to four minutes. Its effect is cumulative, meaning it depends on regular intake rather than a single dose before a workout. So combining it with theacrine here is more of a "coexistence" in one product than synergy.

L-citrulline or citrulline malate is often added to pre-workout formulas to support nitric oxide production. There are no direct studies of the combination with theacrine, but no mechanisms of conflict have been described either.

During prolonged exercise, it is logical to combine theacrine with carbohydrates and electrolytes. A stimulant can reduce the subjective feeling of fatigue but does not replace fuel. A carbohydrate drink during long sessions is a basic strategy to which a stimulant is only an addition.

Undesirable combinations

There are combinations that the editorial team advises avoiding. First of all, this is combining several strong stimulants: synephrine, yohimbine, high doses of caffeine, various "thermogenics." Each substance separately may be relatively safe, but together they can markedly increase heart rate and blood pressure.

Alcohol is also not the best partner. A stimulant masks the feeling of intoxication, and a person may underestimate their state. In addition, the combination worsens sleep and recovery — the very things for which an athlete cares about nutrition at all.

Medications deserve a separate mention. People taking antidepressants, drugs for attention deficit disorder, antiarrhythmics or blood pressure medications should discuss any stimulants with a doctor. For theacrine, drug interactions have been studied very little, and the absence of data does not mean the absence of risk.

Here is a short list of situations in which it is better to forgo combinations with theacrine:

• pregnancy and breastfeeding;
• cardiac arrhythmias, uncontrolled hypertension;
• anxiety disorders and insomnia;
• simultaneous intake of several products with stimulants;
• training late in the evening if sleep is already disrupted.

In these cases the risk outweighs the possible benefit.

Editorial conclusions

The best-studied combination is theacrine with caffeine, and it is also the one that requires the greatest caution, since caffeine increases the blood concentration of theacrine.

Combining it with L-theanine looks logical for cognitive tasks, but direct studies are still lacking. Creatine, beta-alanine, citrulline and carbohydrates can be considered conflict-free partners, since they work through other mechanisms.

Undesirable combinations are several stimulants at once, alcohol, and intake alongside medications without a doctor's consultation.

For a deeper understanding of the topic, we recommend our articles "Myths About Theacrine," "Side Effects of Theacrine" and "What to Combine Paraxanthine With."

References

1. 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.
2. 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.
3. 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.
4. Owen GN, Parnell H, De Bruin EA, Rycroft JA. The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutr Neurosci. 2008;11(4):193–198.
5. Guest NS, VanDusseldorp TA, Nelson MT, et al. International Society of Sports Nutrition position stand: caffeine and exercise performance. J Int Soc Sports Nutr. 2021;18(1):1.
6. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18.
7. Trexler ET, Smith-Ryan AE, Stout JR, et al. International Society of Sports Nutrition position stand: beta-alanine. J Int Soc Sports Nutr. 2015;12:30.
8. EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). Scientific opinion on the safety of caffeine. EFSA J. 2015;13(5):4102.