PureBulk, Inc.
L-Theanine/Caffeine 2:1
Supplement Facts
Serving Size: 1 CapsuleServings Per Container: Varies
| Amount Per Serving | % Daily Value* |
|---|---|
| L-Theanine 200 mg | † |
| Caffeine 100 mg | † |
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value Not Established
‡
These supplement facts may vary from the product you receive. Please call for exact numbers.
Tested By Accredited 3rd Party Labs
PureBulk's supplements are tested by accredited third party labs in the USA to ensure their identity, purity and potency. To receive a copy of these test results or any other PureBulk supplement please fill out the COA request form found here.
*NOTE: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
What is L-Theanine?
L-Theanine is an amino acid naturally found in green tea (Camellia sinensis). It promotes relaxation without sedation by modulating neurotransmitters such as GABA, serotonin, and dopamine. Research shows that L-theanine enhances alpha brainwave activity, which is associated with a calm yet alert mental state.
What is Caffeine?
Caffeine is a well-known natural stimulant found in coffee, tea, and cacao. It works primarily by blocking adenosine receptors in the brain, reducing fatigue and increasing alertness. Researchers have extensively studied caffeine for its cognitive-enhancing effects, including improvements in attention, reaction time, and mental performance.
Why Take L-Theanine and Caffeine Together?
When combined in a 2:1 L-theanine-to-caffeine ratio, the two ingredients create a synergistic effect. L-theanine helps smooth caffeine’s stimulating qualities, often resulting in focused, sustained energy without the common side effects of caffeine alone.
Potential L-Theanine and Caffeine Benefits
Supports Calm, Focused Energy
Studies show that L-theanine can counterbalance caffeine-induced jitters by promoting relaxation while maintaining alertness. The combination improves task accuracy and reduces mind-wandering, making it popular for work, studying, and creative pursuits.
Enhances Cognitive Performance
Combining L-theanine with caffeine produces significant improvements in attention, working memory, mental clarity, and reaction time. L-theanine increases alpha-wave activity, helping maintain calm focus during demanding cognitive tasks, while caffeine provides reliable stimulation for faster processing.
Helps Reduce Stress and Mental Fatigue
L-theanine may help regulate stress responses by supporting GABA and serotonin pathways. Research indicates that pairing it with caffeine can reduce perceived stress and improve mood while sustaining mental stamina throughout the day.
Promotes Smooth, Jitter-Free Alertness
By moderating caffeine’s stimulation, L-theanine helps reduce common side effects such as restlessness, rapid heartbeat, and energy crashes. It is an ideal combination for individuals who are sensitive to stimulants.
Supports Healthy Reaction Time and Accuracy
Several human trials show improved accuracy, reduced errors, and greater multitasking performance when L-theanine and caffeine are taken together, especially under cognitive load or extended focus sessions.
Potential L-Theanine and Caffeine Side Effects
Most individuals tolerate L-theanine and caffeine well, particularly in combination. However, some may experience a mild headache, digestive discomfort, increased heart rate or restlessness (typically due to caffeine sensitivity), or difficulty sleeping if taken too late in the day.
Individuals with preexisting medical conditions, taking prescription medications, or with a sensitivity to stimulants should consult their healthcare provider before use.
References
- https://pubmed.ncbi.nlm.nih.gov/18296328
- https://www.sciencedirect.com/science/article/pii/S1756464611000351
- https://www.sciencedirect.com/science/article/pii/S2213453021001324
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6836118
- https://pubmed.ncbi.nlm.nih.gov/18681988
- https://pubmed.ncbi.nlm.nih.gov/21040626
- https://pubmed.ncbi.nlm.nih.gov/16930802
- https://pubmed.ncbi.nlm.nih.gov/28899506
- https://www.sciencedirect.com/science/article/pii/S1087079225000292
- https://www.ncbi.nlm.nih.gov/books/NBK209050
- https://www.sciencedirect.com/science/article/pii/S0149763416300690
