RARI Nutrition Infinity: An Evidence-Based Review

Infinitry is a pre-workout supplement by RARI Nutriton which contains a fairly standard array of ordinary pre-workout ingredients…

Rari Nutrition Infinity Pre-Workout


L-Citrulline Malate

L-Citrulline is an amino acid involved in a wide variety of physiological processes.  Most notably, it is a precursor to Arginine and therefore necessary for the production of Nitric Oxide.

Citrulline has been studied fairly extensively as a performance enhancement supplement with research indicating that, when dosed in the 6-9g range, it can enhance muscular endurance, increase Nitric Oxide production, and reduce muscle soreness.

While Citrulline Malate itself is quite reliable, in the context of Rari Nutrition’s Infinity, it appears pretty under-dosed.

Even if the 5.6g proprietary blend was all Citrulline Malate, it would just fall under what can be considered a clinical dose, and of course, that’s not the case.  Realistically, there is probably only 1-2g of Citrulline in each serving of Infinity, far less than a clinical dose.


Beta-Alanine is a precursor to the depeptide Carnosine, higher muscular concentrations of which are associated with greater muscular endurance.  Beta-Alanine has been studied quite extensively in human subjects and it is considered a highly reliable means of increasing muscular Carnosine levels.

Carnosine works by reducing Lactic Acid build-up in working muscle tissue, effectively preventing fatigue from setting in for longer.

The ideal range is 3-6g/day, as this is what has been used in most of the studies, but doses as low as 1.6 have still proven to increase Carnosine levels over time.  It just takes longer with lower doses.

Agmatine Sulfate

Agmatine, though popular in pre-workout supplements these days, is actually somewhat speculative because there haven’t been any human studies conducted regarding it’s impact on exercise performance.

The hypothesis behind Agmatine is that it can increase Nitric Oxide levels and allow more blood flow to muscle tissue by increasing the action of Endothelial Nitric Oxide Synthase (eNOS), the enzyme responsible for catalyzinig the production of Nitric Oxide.

Again, no human studies have confirmed that it can indeed increase Nitric Oxide levels to the point where exercise performance improves, but the theoretical mechanism certainly exists.


Tyrosine is an amino acid which serves as the precursor to the neurotransmitters Dopamine and Nordarenaline, both involved in focus, attention, and mood.

Because of this relationship, many people assume that Tyrosine can increase levels of Dopamine and Nordarenaline, but research indicates that excessive Tyrosine consumption does not increase Dopamine and Nordrenaline.

That said, Tyrosine can help to preserve these important neurotransmitters under circumstances when they would otherwise become depleted, such as in the presence of an acute stressor (like exercise maybe).

Infinity uses N-Acetyl-L-Tyrosine which is allegedly better absorbed than normal L-Tyrosine.

Caffeiene Anhydrous

Caffeine usually provides the “kick” in most pre-workout supplements, as is the case with Infinity.  By triggering the release of Noradrenaline, Caffeine is able to increase perceived energy and focus which generally results in better, more intense workouts.


Bioperine is simply a patented form of Black Pepper Extract that has been shown to increase the absorption of other nutrients ingested alongside it.  It accomplishes this by slowing intestinal transit, but of course we can’t be sure how much exactly Black Pepper Extract helps in cases of severe under-dosing.  Does Black Pepper Extract make up for the fact that most of the ingredients in Infinity are far below what can be considered a clinical dose?  Probably not…

is Infinity Safe?

There is nothing inherently dangerous about Infinity Pre-Workout.  Despite the use of a proprietary blend, Rari Nutrition lists the dose of Caffeine in each serving of Infinity at 175mg.  This is not a particularly high dose and leaves the option of taking two servings, a must if you want to possible acheive clinical doses of certain ingredients.

The Bottom Line

We’re not too impressed with Infinity.  It looks like Rari Nutrition just took a few standard pre-workout ingredients and tossed them together in a proprietary blend, then sprinkled some Caffeine on top to provide some energy.  Unfortunately, most of the ingredients are under-dosed on a per serving basis so multiple servings would be needed to acheive clinical doses.

Still not sure which pre-workout supplement is right for you?  Check out our Top 10 Pre-Workout Supplements List. exists to educate the supplement community and seperate the science from the hype.

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