Theacrine: does it work?
Not clearly, on its own. It’s a caffeine-like compound from a Chinese tea, and five sport trials found no clear gain. Many products add caffeine. That changes how much reaches your blood.
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What is theacrine, and does it work?
Theacrine is a plant compound found in some coffee plants, a fruit called cupuacu and a Chinese tea called kucha. Kucha leaves make it from caffeine.
Its shape is close to caffeine’s, and it acts on the same spots in the brain that caffeine blocks (adenosine receptors). On labels you’ll often see TeaCrine, a lab-made version.
Does it work? For sport, the answer so far is no clear gain. Five trials tested it in athletes, and none found a clear win over a dummy pill.
| What was tested | What theacrine alone did | Who took part |
|---|---|---|
| Bench press and squat | No gain at 300 mg. | 12 trained men |
| Sprints, jumps and runs | No difference from a dummy pill. | 22 flag-football players |
| 4 km cycling | No gain. A high dose raised blood pressure. | 19 cyclists |
| 500 m canoe sprint | No clear gain. Caffeine did help. | 20 elite paddlers |
| Running to exhaustion | Longer, but not by a clear margin. | 24 football players |
Sources: Cesareo 2019; Cerqueira 2022; Vieira-Cavalcante 2025; Jovanov 2025; Bello 2019
These trials are small, from 12 to 24 people each. Small trials can miss a small effect. But none of them gives you a reason to pick theacrine over caffeine for a workout.
Thinking of a pre-workout without stimulants? See stim-free pre-workout.
Does theacrine affect energy, focus and sleep?
Sometimes people feel it. In 15 healthy adults, one 200 mg dose raised feelings of energy and concentration and cut tiredness, compared with a dummy pill.
Feeling sharper is not the same as testing sharper. A product with theacrine and caffeine lifted feelings of energy and mood but didn’t clearly improve brain tests.
More isn’t better either. In 19 regular caffeine users, high doses didn’t raise energy at all, while the dummy pill did.
In the strength trial, only caffeine raised energy, focus and motivation.
Sleep looks less affected than you might fear. Doses of 100 mg and 400 mg, even 4 hours before bed, had no clear effect on sleep. The 400 mg dose showed small effects that weren’t clear.
Tired most days? A supplement may hide the cause. See what causes low energy.
Why is theacrine mixed with caffeine?
Caffeine raises how much theacrine reaches your blood. When 8 adults took the two together, caffeine raised the amount of theacrine in their blood. Their heart rate and blood pressure didn’t change.
Think of caffeine as opening the door a little wider. More theacrine gets in, but that doesn’t prove it does more once it’s there.
Mixes have shown some gains. In paddlers, caffeine plus theacrine sped up sprints, but less than caffeine alone. In footballers, the mix gave faster choice reaction times, and so did caffeine alone.
So with a mix, the caffeine is the part with the best evidence. Count it like any other caffeine. See caffeine in coffee for how it adds up.
Is theacrine safe?
Short trials in healthy young adults look reassuring. In 60 people taking 200 or 300 mg a day for 8 weeks, blood and heart checks stayed normal.
At 6 mg per kg of body weight, about 420 mg if you weigh 70 kg, theacrine raised blood pressure at rest.
At 3 or 6 mg per kg, some cyclists had stomach upset, a racing heart feeling, dizziness, headache and shaky hands. High doses also raised cortisol, a stress hormone, in saliva.
No trial we found tested theacrine in pregnancy, in children or in people with heart problems. Many products also hold caffeine, so the caffeine limits below apply.
- 200 mg or belowWithin the NHS 200 mg pregnancy limit.
- Above 200 up to 400 mgUnlikely to harm most adults. Over the pregnancy limit.
- Above 400 to just under 1200 mgOver the FSA’s 400 mg a day.
- 1200 mg or aboveFSA: serious effects seen around 1,200 mg.
Source: FSA
Check the caffeine per serving on the label, then add your tea and coffee. A bad night after a late dose? See when to stop caffeine for sleep.
How to use a theacrine supplement safely
Six checks before you take a theacrine product
- Read the label for the caffeine per serving, as well as the theacrine.
- Avoid more than 200 mg of caffeine in one supplement serving, or 400 mg across the day.
- Add every source: tea, coffee, energy drinks and other supplements count too.
- Stick to the dose on the label. One 8-week trial in healthy young adults found normal checks at up to 300 mg of theacrine a day.
- Pregnant? Keep to 200 mg of caffeine a day, and look for “Contains caffeine. Not recommended for children or pregnant women” on the label.
- Take medicines or have high blood pressure? Ask a pharmacist or GP first.
Sources: FSA; Taylor 2016; Vieira-Cavalcante 2025
Buy online only if you’re confident the seller is reputable, the FSA says. Never stop or change a prescribed medicine without your prescriber.
Want a calmer option to try with your tea? Read L-theanine for anxiety and sleep.
When to speak to a GP
Too much caffeine can cause anxiety, poor sleep, agitation, a pounding or fluttering heartbeat (palpitations), diarrhoea and restlessness. It can worsen psychosis in people with a mental health condition. Stop the product, and see a GP if:
- You’ve had palpitations that keep coming back, happen more often or last longer than a few minutes. NHS: see a GP.
- You get palpitations and have a heart condition, or heart problems run in your family.
- You have high blood pressure or heart disease and want to try a stimulant. The FSA says caffeine effects may be more severe for you.
Call 999 or go to A&E if palpitations do not go away, or come with chest pain, shortness of breath, feeling faint or fainting. If those symptoms have stopped, ask your GP surgery for an urgent appointment or call 111.
More on palpitations and blood tests.