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PHENIBUT + L-THEANINE is a synergistic combination that contains two excellent ingredients with a positive effect on stress resilience. Phenibut quickly and effectively relaxes both the body and the mind. L-Theanine has many similar effects as it reduces stress, stabilizes the mood and improves sleep. This stack combines the immediate action of phenibut with the long-term relaxation caused by L-theanine.



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Phenibut is an extremely effective compound that helps to eliminate physical and mental nervous tension. It is a phenyl derivative of GABA – a natural neurotransmitter that acts primarily on GABA-B receptors. Phenibut was developed for Russian astronomers as a means of effectively reducing stress and anxiety but without limiting cognitive ability. Interestingly, it works very quickly so it is suitable to be used on an ad hoc basis – in case of very strong, sudden stress. However, it is important to follow the dosing guidelines closely and do not take this preparation more often than necessary. The second component of this preparation, L-theanine is an amino acid that naturally occurs in green tea. It shares many properties with phenibut – most importantly, it helps to relax and cope with stress. What is more, it increases the activity of alpha brain waves, making it easier to reach a state of deep relaxation. Keep in mind that L-theanine works subtly. The effects of its use are only noticeable after a certain period of time, but persist longer. We came up with this combination of active substances to prepare a product that significantly reduces stress and anxiety, particularly social anxiety. Besides, its calming properties support a good night’s sleep, and thanks to increased GABA activity, the whole body can regenerate more efficiently.

Phenibut, in combination with L-theanine, is the most potent synergistic anti-anxiety formula. It is effective in reducing strong and sudden stress reactions but due to its mechanism, it should be used occasionally and in line with recommendations. And since phenibut also stimulates dopamine activity, it may add some confidence and help to break social fear.

Ingredients of Phenibut NooSynergy™ formula:

Phenibut | GABA-Phenol™
  • 500 mg / 2 caps.
Phenibut is an exceptionally effective compound that helps to eliminate both physical and mental nervous tension. It is a phenyl derivative of GABA - a natural neurotransmitter that interacts mainly with GABA-B receptors in the nervous system. What is more, it has great bioavailability and crosses the blood-brain barrier easily. Phenibut has been developed as an aid for Russian cosmonauts who were facing a lot of stress and anxiety. It turned out that this compound became really effective in reducing stress symptoms without a sedative effect. However, taken in the evening, it helps to fall asleep and supports regeneration of the muscle tissue during a good night’s rest.
L-Theanine | PharmaTheanine™
  • 200 mg / 2 caps.
L-theanine is a natural amino acid considered to be a part of nootropic and compounds that support and protect the nervous system. It can be found in the leaves of common tea (Camellia sinensis) - making up to 3% of dried leaf mass. One of the main properties of L-theanine is the ability to improve stress resilience. This compound inhibits cortisol while stimulating the activity of GABA - a key neurotransmitter that helps to mitigate stress symptoms. Moreover, L-theanine stimulates alpha brain waves that are related to the state known as a “relaxed attention”, typical for activities requiring a high focus, e.g. meditation. Thanks to that, L-theanine makes it easier to concentrate on the task at hand. It also has a beneficial effect on memory because it stimulates the process of neurogenesis during which new neural cells are produced. In dietary supplements L-theanine is often mixed with caffeine because in this composition stimulatory effects of caffeine are more subtle yet more durable with much less side effects such as agitation or anxiety.

PHENIBUT + L-THEANINE formula benefits

Increases stress resilience: GABA is the main inhibitory neurotransmitter. Its proper activity is crucial to cope with stress and remain composed, even in difficult situations. Phenibut is an agonist of GABA-B receptors which means that it stimulates them just like their natural ligands. The results of clinical trials show that its use helps to reduce effects of stress, especially in people who are exposed to high stress levels. The measurable effect of phenibut is the reduction of cortisol, often called the “stress hormone”. L-theanine also helps to lower levels of cortisol and other stress biomarkers because it reduces the activity of glutamate – the main excitatory neurotransmitter. At the same time, it stimulates the natural production of GABA in the central nervous system bringing a long-term improvement of stress resilience.

Supports and stabilizes the mood: Phenibut, as a synthetic equivalent of GABA, helps to cope with the consequences of low activity of this neurotransmitter. This is because it reduces the symptoms of an overstimulated brain, such as irritability and explosiveness. L-theanine boosts alpha-frequency brain waves (8-12 Hz) that are linked to the states of relaxation and rest. In sum, these two amino acids might be an effective support for one’s mental comfort and the stability of mood.

Improves sleep quality: Proper GABA activity is responsible for, among other things, calming and soothing the mind. It eliminates excessive and unnecessary nerve impulses. Phenibut stimulates GABA receptors so it helps to relax and makes it easier to fall asleep. Moreover, phenibut and L-theanine promote the NREM phase of sleep during which intense body regeneration occurs. It is worth mentioning that improved GABA activity is related to an increased secretion of growth hormone. Because of that, during the night the regenerative processes are particularly effective in restoring muscle fibers that might be damaged due to intensive physical effort, e.g. after a workout.

PHENIBUT + L-THEANINE formula specification


  • preparation in gelatin capsules
  • 2 capsules daily unless advised otherwise by a professional
[700 mg / 2 caps.]
  • airtight PET bottle 100 ml / 120 ml
  • nutrition, neuroregulation, herbal medicine
  • ingredient admitted to trading in the EU and the US


  • 2
  • 1 – 2
  • without food
  • during the day / before bedtime
  • use occasionally – max. 3 – 4 times a week

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The above information about products should be considered a historical and scientific facts, not a recommendation on how to use a specific substance. Dietary supplements should not be treated as an alternative to a healthy lifestyle and balanced diet. The above information is not medical advice. Every use of a dietary supplement or herbal/nootropic compound should be consulted with a doctor or a specialist. Dietary supplements as well as nootropic and herbal compounds should not be mixed with medication. Our products should not be used by breastfeeding women and by the people under the age of 18.