This is the state gaming supplements are sold to sharpen, sustained attention during a live competitive match.
U.S. Air Force photo by Airman 1st Class William Tracy
Illustrative: an Airman competing in a 2018 U.S. Air Force intramural Overwatch tournament, not a participant in either cited caffeine trial.
Most Gaming Supplements Are Just Caffeine, and Nobody Can Tell You the Right Dose
I write about energy drinks and nootropics as two separate categories most weeks, but this month two new reviews landed in the same journal and did something nobody had actually bothered to do before, they counted what is really inside the gaming supplement category's evidence base, ingredient by ingredient, trial by trial. The answer explains a lot about why a shelf full of proprietary blends all seem to work about the same amount.
- Two 2026 systematic reviews of randomized trials in esports players found that more than 75 percent of every gaming supplement protocol ever tested is caffeine or caffeine plus something else.
- Pure caffeine was the one ingredient with consistent effects on reaction time, accuracy, alertness and fatigue, at doses that ranged from 40 to 270 milligrams across the trials.
- A newer three level meta analysis found a large overall performance benefit from these supplements, but no reliable relationship between a higher caffeine dose and a bigger effect.
- Only two ingredients that are not caffeine, inositol enhanced arginine silicate and GABA, have any randomized evidence behind them at all, and it is thin.
What happens when somebody actually counts the ingredients
The first review pulled together thirteen randomized trials run on esports players between 2019 and 2025, four hundred sixty six people in total, testing eighteen different supplementation protocols delivered as capsules or energy drinks. Fourteen of those eighteen protocols turned out to be pure caffeine or caffeine paired with something else, Dynamine, TeaCrine, L theanine, chlorogenic acid or a multivitamin. Pure caffeine on its own produced faster reaction times, better shooting accuracy, higher kill ratios, more alertness and less fatigue. The caffeine formulations added improvements in attention, cognitive flexibility, executive function, vitality and reduced negative emotion on top of that. In other words, a category that markets itself on proprietary nootropic complexity has, so far, mostly been tested as one cheap, familiar stimulant wearing different packaging.
The dose nobody will name
Doses across those thirteen trials ranged from forty to two hundred seventy milligrams, and because the doses and the outcome measures varied so much from study to study, the review's own authors declined to name an optimal one, asking instead for future trials to test weight adjusted dosing, three to six milligrams per kilogram of body weight. A second, newer review, a three level meta analysis that searched the literature through January 2026, pooled the same small pile of studies and found a large overall performance benefit, a statistic called Hedges g of 0.92, strongest for processing speed and executive function. Gains held up in both professional and amateur players, and were larger in first person shooters than in team strategy games like MOBAs. But when the researchers ran a dose relationship analysis across the pool, they found no significant link between a higher caffeine dose and a bigger effect. More was not reliably better. For scale, a standard energy drink runs about one hundred fifty to two hundred milligrams, comfortably inside the range these trials tested, which means the honest takeaway is not a magic number to chase, it is that the range itself has never been shown to have a sweet spot.
The two ingredients that are not caffeine
Only two ingredients in this entire literature are not caffeine and still have any randomized evidence behind them at all. Inositol enhanced arginine silicate, tested across two small studies at fifteen hundred milligrams of arginine silicate plus one hundred milligrams of inositol, improved executive function, working memory and vitality, and reduced anger scores. GABA, tested in a single study at two hundred milligrams, reduced fatigue and negative emotion and improved in game performance. Both are genuinely promising and genuinely thin, the kind of finding that is worth watching rather than worth building a supplement stack around today. And there is a safety note the category rarely prints on the label, no serious adverse events showed up across any of the thirteen trials, but some caffeine containing products were linked to higher cortisol, more anxiety, more tension and more headaches.
Honest caveat
The evidence underneath both reviews is small, young, mostly male and mostly amateur. Four hundred sixty six people across thirteen trials, eighty five percent of them men, and only three of the studies used elite level players rather than amateurs. Most were small crossover designs. The first review's own authors call their findings preliminary and are asking for larger trials with more women, more elite players and standardized adverse event reporting before anyone treats this as settled. There is also a timing detail worth naming plainly, that first review carries a 2025 publication date and searched the literature only through June 17, 2025, so any coverage treating it as brand new news is really coverage of an older paper. The second review, searched through January 25, 2026, is the one to lean on for anything about dose specifically. And the two reviews are not as independent of each other as an outside reader might assume, both were published in the same journal, both are authored by researchers in China, and both draw on a heavily overlapping pool of the same thirteen randomized trials, which makes them two readings of one evidence base rather than two separate confirmations of it.
What this means for you
If you or someone in your house is buying a gaming or focus supplement expecting a proprietary blend to be doing something exotic, the honest answer right now is that it is very likely doing the same thing a cup of coffee or a standard energy drink already does, at a similar or sometimes lower dose. The trials give you no real reason to chase a specific milligram number, since even the researchers who ran them could not find one dose that reliably beat the others across the forty to two hundred seventy milligram range they tested. Watch the ceiling more than the floor. The safety signal in these same trials was not about caffeine failing to work, it was about some caffeine products raising cortisol, anxiety, tension and headaches, so more is the direction most likely to cause a problem, not the direction most likely to help. And if you are curious about the two ingredients with any evidence that are not caffeine, inositol enhanced arginine silicate or GABA, go in knowing that evidence is one or two small studies deep. Worth watching, not worth trusting yet.
Primary sources
- Huang D, Zheng Y, Xu M, Huang W. Nutritional supplements to improve esports player performance: a systematic review of randomized controlled trials. Journal of the International Society of Sports Nutrition, 2025.
- Effects of nutritional interventions on competitive performance and dose response relationships among esports players of different skill levels: a systematic review and three level meta analysis. Journal of the International Society of Sports Nutrition, 2026.
Common questions
Is caffeine really the best gaming supplement, or just the most studied one?
Both, in a sense. Caffeine is the most tested ingredient in this category by a wide margin, which is exactly why it is also the one ingredient with consistent effects across trials. That is not the same as proof that it beats every alternative, it is proof that almost nothing else has been tested carefully enough to compare.
How much caffeine should I actually take before gaming?
There is no dose that these trials showed to reliably outperform the others within the forty to two hundred seventy milligram range tested. Researchers have asked for future trials to test weight adjusted dosing, roughly three to six milligrams per kilogram of body weight, but that has not been established as optimal either. A standard energy drink, around one hundred fifty to two hundred milligrams, sits comfortably inside the range that has already been studied.
Are the non caffeine ingredients, like arginine silicate or GABA, worth trying?
They are worth watching. Inositol enhanced arginine silicate has two small supporting studies and GABA has one, both showing real benefits for things like working memory, vitality and reduced fatigue. That is promising, but it is also thin evidence compared to caffeine's much larger trial base, so treat either one as an experiment rather than an established choice.
Stay Curious.
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