A study in Nutrients with 33 healthy students showed something very clear. Taking guarana and green tea for ten days improved their mental speed, attention and ability to retain information compared to the same tests performed before.
The participants were young people aged 19 to 25, with no relevant health problems. After consuming 2 grams per day of guarana and 1.5 grams per day of green tea at separate periods, their scores on reaction, memory and concentration tests rose consistently. For those who live with a high mental workload, this data explains why some days the mind flows and other days everything seems to cost twice as much.
Study shows guarana and green tea sharpen the mind on demand
The trial was simple and very practical. For ten days, students took a daily dose of guarana powder, then took a three-day break and spent another ten days on green tea. Before and after each phase they took standardised tests of processing speed, memory and attention.
Initial scores ranged from 30 to 75 points. After the guarana period, the minimum scores rose above 40 points and the maximum scores reached 83. Most students made gains of between 10 and 20 points, which in practice means responding faster, making fewer errors and maintaining focus for longer.
With green tea, there were also improvements, especially in feelings of calm and well-being. However, the stimulating effect on intellectual performance was more marked with guarana. The students themselves described more mental energy, better concentration and easier retention of information on guarana days.
Caffeine, catechins and theobromine explain the observed cognitive boost
Guarana and green tea share a physiological core, stimulating the central nervous system via caffeine and other bioactive compounds. Caffeine blocks adenosine receptors in the brain, molecules that signal tiredness and lower alertness. When blocked, it increases the release of dopamine and noradrenaline, key neurotransmitters for attention and motivation.
Guarana has more caffeine than coffee, two to four times more per gram. It also provides theobromine and theophylline, methylxanthines that prolong the stimulant effect and modulate muscle contraction and circulation. This cocktail prolongs the feeling of energy and sustains the speed of response without the sharp spikes of some energy drinks.
Green tea adds another layer. Its catechins, especially epigallocatechin gallate, known as EGCG, have antioxidant and neuroprotective action. They reduce free radicals, modulate inflammation and protect brain structures involved in memory and executive functions. Many participants described green tea as a blend of gentle clarity and calm, which is helpful when mental stress is combined with anxiety.
Modern life depletes these mechanisms and makes it difficult to reach effective doses.
The brain is designed to alternate between intense focus and deep rest. Today’s daily life imposes the opposite, prolonged concentration, constant screens, interruptions and few real breaks. This pattern forces the alert circuits to work almost without respite.
If sleep is also irregular and the diet is based on fast food, the margin for recovery is further reduced. Adenosine levels build up, dopamine oscillates and the result feels like mental fog, difficulty organising ideas and fatigue that a quick coffee won’t solve.
The study used 2 grams per day of guarana and 1.5 grams per day of green tea for ten days in a row. Replicating these amounts with beverages alone requires very precise planning, quality control, avoiding added sugars and adjusting schedules so as not to disrupt rest. For most people with demanding jobs, families and little time, this daily discipline is unrealistic.
Habits that support mental clarity according to this evidence
The results of the study fit with a simple idea. The brain performs best when it receives adequate stimuli and nutrients on a consistent basis, not just during exam periods. Maintaining proper hydration, including moderate sources of quality caffeine and prioritising vegetables, fruit and lean protein creates a more stable metabolic environment.
Setting aside screen-free blocks, taking short breaks between tasks and avoiding late-night accumulation of work reduces the overload on attention circuits. Getting sufficient and regular sleep makes it easier for adenosine to drop and neurotransmitters to rebalance.
Even with these habits, achieving precise daily combinations of compounds such as caffeine, theobromine, EGCG or specific amino acids is complex. This is where a well-designed supplement can bring precision and consistency, always in support of an already well-manicured lifestyle.
How Nutribiolite’s Onit, a mental performance supplement, aligns with this evidence
The study shows that a specific combination of guarana and green tea measurably improves processing speed, attention and information retention in healthy students. It also reflects two complementary sensations, more stable mental energy with guarana and concentrated calm with green tea.
Nutribiolite’s Onit is a food supplement based on plant extracts, amino acids, choline and phosphatidylserine, designed to support these same cognitive functions in mentally challenged adults. It integrates guarana in the form of standardised extract and green tea in the form of leaf extract, which concentrates its active compounds and makes it easier to achieve effective amounts without resorting to several sugary drinks a day.
In Onit, guarana provides methylxanthines that support alertness and speed of response. Green tea extract contributes antioxidant catechins that protect neurons against oxidative stress associated with long days and intensive screen use. This base is reinforced by specific amino acids involved in the synthesis of neurotransmitters involved in memory and concentration.
The choline included in the formula supports the production of acetylcholine, an essential messenger for sustained attention and learning. Phosphatidylserine, a phospholipid naturally present in the membranes of neurons, helps maintain fluidity and communication between nerve cells, which is key when sustained intellectual performance is required.
The synergy between guarana and green tea extracts, amino acids, choline and phosphatidylserine has a specific effect. It optimises mental energy, supports clarity under pressure and makes it easier for the brain to manage periods of intense study, interlocking meetings or projects that require deep concentration. All this in a formula without unnecessary additives, designed for daily use by adults who already take care of their diet and physical activity.
Nutribiolite Onit supports memory, concentration and daily mental performance with a precise combination of plant extracts, amino acids, choline and phosphatidylserine.
Final summary, science, habits and smart brain support
The trial in healthy students indicates that guarana and green tea, at specific doses and times, improve intellectual performance as measured by objective tests. The mind responds best when it has stable energy, balanced neurotransmitters and protection from oxidative stress.
The basis remains the same: sufficient sleep, a diet rich in vegetables and quality protein, regular movement and sensible stress management. From there, a supplement like Nutribiolite’s Onit offers a structured way to deliver guarana, green tea, amino acids, choline and phosphatidylserine in ratios designed to support memory, focus and mental clarity in real life.
This content is for informational purposes only and is not a substitute for the advice of a healthcare professional.
Frequently asked questions
What the study on guarana, green tea and mental performance showed
The study in healthy students found that ten days of guarana and green tea consumption increased processing speed, improved accuracy in attention tasks and facilitated retention of information compared to baseline tests.
Why guarana was perceived as more stimulating than green tea
Guarana contains more caffeine than coffee and also provides theobromine and theophylline. This combination prolongs alertness and feelings of mental energy. In the study, more students described a clear boost in concentration and vitality with guarana than with green tea.
What green tea provides on a cognitive and emotional level
Green tea combines caffeine with catechins such as EGCG and amino acids such as L-theanine. This blend is associated with a feeling of alert calmness, moderately improved alertness and general well-being, which many participants described as a relaxing but lucid effect.
Who does it make sense to use a supplement like Onit for?
Onit is intended for healthy adults with a high mental workload who want to support memory, concentration and clarity during the day. It may suit people who study, work with a lot of decisions or experience frequent mental fatigue despite a careful lifestyle.
How to integrate Onit into a healthy mental performance routine
Onit can be used as part of a daily routine that includes sufficient sleep, active breaks, varied nutrition and stress management. Its combination of guarana, green tea, amino acids, choline and phosphatidylserine provides additional and constant support for the cognitive processes that the study highlights as sensitive to these compounds.
