Home Ingredients PurTea® (Organic Green Tea Caffeine — Applied Food Sciences)
EnergyAthletic Performance

PurTea® (Organic Green Tea Caffeine — Applied Food Sciences)

Camellia sinensis
Evidence Level
Limited
1 Clinical Trial
3 Documented Benefits
2/5 Evidence Score

PurTea® is an organic green tea (Camellia sinensis) extract from Applied Food Sciences, providing naturally sourced caffeine along with green tea catechins. It offers a clean-label source of caffeine for energy. Because it is standardized to caffeine (up to 95 percent), the green tea catechins are present only in small amounts, and no antioxidant benefit from this product has been measured in people.

Studied Dose Commonly 100 to 200 mg of caffeine per serving.
Active Compound Organic green tea extract standardized to caffeine (Applied Food Sciences lists a 95 percent caffeine grade and a 30 percent grade). Because it is standardized to caffeine, catechins (including EGCG) and L-theanine are present only in small amounts, well below the doses studied for catechin or theanine effects.

Benefits

Energy and alertness

Caffeine reliably increases alertness, focus, and perceived energy, here from a natural, organic green tea source.

Supported by Trial 1

Exercise performance

A meta-analysis of 21 randomized trials found caffeine (3 to 9 mg/kg) improves endurance running and time to exhaustion (medium effect). The benefit comes from the caffeine, not from anything unique to this green tea source.

Supported by Trial 1

Clean-label caffeine source

PurTea is standardized to caffeine (up to 95 percent), so at a serving delivering 100 to 200 mg of caffeine the green tea catechins and L-theanine are present only in small amounts. No antioxidant or calming effect from this product has been measured in people.

Supported by Trial 1

Mechanism of action

1

Adenosine blockade

Caffeine blocks adenosine receptors in the brain, reducing fatigue and increasing alertness.

2

Catechin antioxidants

Green tea catechins can scavenge free radicals, but because PurTea is standardized to caffeine the catechin content at a normal serving is small.

Clinical trials

1
Caffeine and Endurance Performance — Meta-Analysis
PubMed

Systematic review and meta-analysis of caffeine intake on endurance performance. (Wang et al. 2022, Nutrients)

Adults in 21 randomized caffeine trials (254 participants); no participant took PurTea.

Caffeine at 3 to 9 mg/kg increased time to exhaustion (Hedges g 0.39, medium effect) and modestly reduced running time-trial time. This is generic caffeine evidence, not a test of PurTea.

Side effects and drug interactions

Common Potential side effects

Can cause jitteriness, rapid heartbeat, or trouble sleeping.
Avoid late in the day if caffeine-sensitive.
Each serving provides roughly 100 to 200 mg of caffeine; add up caffeine from coffee, tea, energy drinks and other supplements so the daily total stays reasonable. Not intended for children.

Important Drug interactions

Stimulant medications — additive effects; use caution.
Some antibiotics and antidepressants slow caffeine clearance.
Pregnancy: most authorities advise keeping total caffeine under 200 mg per day, so a single serving can approach that limit; consult a doctor.

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Frequently asked questions about PurTea® (Organic Green Tea Caffeine — Applied Food Sciences)

What is PurTea?

PurTea® is an organic green tea (Camellia sinensis) extract from Applied Food Sciences, providing naturally sourced caffeine along with green tea catechins. It offers a clean-label source of caffeine for energy.

What is PurTea used for?

PurTea is researched primarily for Energy and Athletic Performance. Caffeine reliably increases alertness, focus, and perceived energy, here from a natural, organic green tea source.

What is the recommended dosage of PurTea?

The clinically studied dose is Commonly 100 to 200 mg of caffeine per serving. Always follow the product label and check with a healthcare provider for personal advice.

Is PurTea safe, and does it have side effects?

For most healthy adults, PurTea is well tolerated at studied doses. Reported effects can include: Can cause jitteriness, rapid heartbeat, or trouble sleeping. Avoid late in the day if caffeine-sensitive. It may also interact with some medications. PurTea is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does PurTea interact with any medications?

Possible interactions include: Stimulant medications — additive effects; use caution. Some antibiotics and antidepressants slow caffeine clearance. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for PurTea?

NutraSmarts rates the evidence for PurTea as Limited (2 out of 5). It is backed by 1 clinical trial and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Wang Z, Qiu B, Gao J, et al. Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis. Nutrients. 2022;15(1)..PubMedUsed to support: Meta-analysis of 21 randomized crossover trials (254 adults) finding caffeine 3 to 9 mg/kg improved endurance running: time to exhaustion Hedges g=0.392 (medium) and running time-trial time reduced g=-0.101 (small). Generic caffeine evidence, not a PurTea trial.