It was really easy to mix and dissolved really well. The was no grit left at the bottom of the shaker and only need seconds of a standard shaker to thoroughly mix the product. I found it very refreshing and felt strangely hydrated even after a long workout. This was especially apparent during cardio sessions when usually after sweating for 45 minutes I feel a bit drained and dehydrated, I found that sipping on ISO Drink allowed me to replenish and re-hydrate as quickly as I was sweating it out.
I think that this works much better as an intra than as a preworkout also I feel that its probably more geared towards sports and cardio rather than weight lifting. On the other hand, too much can leave you jittery, nauseous, and anxiety-ridden. Moreover, not everyone can handle the same amount of caffeine. This is complicated by the fact that some low-quality energy drinks lean heavily and in some cases, almost entirely on caffeine for their effects.
In that case, why not just take a caffeine pill or have a cup of coffee? Keeping these potential issues in mind, we eliminated energy drinks that had more than mg of caffeine in each can or bottle, and those that had less than 80 mg. We also cut anything without other proven nootropic or performance-enhancing ingredients. Speaking of other ingredients, we looked for energy drinks that also featured B-vitamins and specific amino acids that have been linked to better physical performance and cognitive functioning.
Including a high dose of niacin is another trick that some energy drink manufacturers rely on to create the perception of more energy. Lastly, we rated the remaining energy drinks on how well they integrated other, more cutting-edge compounds for better mental function or mood elevation, such as the neurotransmitter 5-HTP or the herbal supplement yohimbe.
Our remaining top-rated energy drinks take the best advantage of these more experimental ingredients alongside mainstays like caffeine and B-complex vitamins. Broadly speaking, all energy drinks are caffeinated and usually provide something beyond just caffeine to boost your energy levels. The most common among these extra ingredients are B vitamins, taurine, green tea extract, and herbal extracts like yerba mate extract and guarana.
Energy drinks rocketed to popularity after an obscure local drink in Thailand was reformulated and marketed to a global audience. That drink, of course, was Red Bull, which is a market-dominating juggernaut among energy drinks. Caffeine has the biggest role when it comes to boosting energy. Caffeine is a stimulant, meaning it kick-starts your metabolism, increases your alertness, improve your reaction time, and increase your physical performance during exercise.
The amount of caffeine you consume is related to the strength of these effects, but as always, there can be too much of a good thing! Taurine is another staple ingredient of energy drinks, but it might not be a very important one. It plays a critical role in the development of the nervous system and ensuring its proper function. By including taurine in energy drinks alongside caffeine, the hope is that the energy drink will elevate your nervous system to a higher performing level than with caffeine or taurine alone.
A highly detailed study published in by Grace E. Giles and other researchers at Tufts University attempted to tease out how caffeine and taurine interact to produce the reported benefits of energy drinks 5. In their study, a group of volunteers were given a randomized series of four treatments: caffeine only, taurine only, caffeine and taurine, and a true placebo. After administering each treatment, the researchers subjected the study subjects to a battery of cognitive tests.
As expected, caffeine had a consistent and significant beneficial effect on tasks like short term memory and reaction time. Taurine had some beneficial effects too, but even when combined with caffeine, it contributed only in a small, varied, and unpredictable way to cognitive performance. B vitamins could help improve the function of your central nervous system. These play a key role in the functioning of your nervous system too.
Like with taurine, the hope is that the B vitamins will interact synergistically with the caffeine to boost your energy levels and alertness to a higher level than possible with just caffeine. Spradley found that a pre-workout supplement that combined caffeine and B-vitamins, along with a few other ingredients, did boost performance on agility and lower body muscular endurance during an exercise testing session 6.
However, it did not evaluate the role of each ingredient individually—it was compared against a true placebo, not a caffeine-only supplement. B-complex vitamins could help elevate your physical and mental stamina, as well as your concentration. A range of B-vitamins are commonly included in energy drinks alongside the caffeine, taurine, sugar, and other popular ingredients.
Do these B-vitamins make a difference? Some research suggests that they do. A paper published in the journal Human Psychopharmacology tested the effects of a high-dose B-complex vitamin on self-reported physical stamina, mental stamina, and concentration levels over the course of a four-week study 7. The subjects were split into two groups, one of which received a high-dose B vitamin supplement, and the other of which received a placebo.
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