Core Extreme NutritionPre-Workout

Core Extreme Nutrition RX’D Review

By April 9, 2018 January 5th, 2019 No Comments

Core Extreme Nutrition RX'D













  • Clean Profile
  • Effective
  • Taste
  • Value


  • N/A

Overview of Core Extreme Nutrition RX'D

I call Core Extreme Nutrition a quiet killer. What does that mean? Quietly they are making some really top-notch products that aren’t gaining mainstream attention like they should. Hence why we are here. Core Extreme Nutrition prides itself on making cutting-edge, effective products.

RX’D from Core Extreme Nutrition is a really decent pre-workout leveraging proven ingredients at effective dosages to provide one heck of a lift. They focus on clean ingredients – nothing out of the box (per se) that work well together. Overall, this is a really nice pre-workout, safe and effective, but it does come at a premium price.

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Testing Results and Ratings

We reviewed Core Extreme Nutrition RX’D on five categories. We first start by looking at it’s ingredient profile. This portion of the review looks at the different ingredients used in the pre-workout, what their intention is and how effectively dosed are each ingredient.

We then look at effectiveness. An effective pre-workout will use high quality, proven ingredients, at clinically backed dosages.  This is generally an extension of the profile section. The higher quality ingredients used at proper dosages, the more effective that product will be.

Then we move into the taste of the different flavors we’ve tried. We grade each flavor separately and average the scores for their overall taste rating. We were able to test out the following flavors: Bombscicle.

Mixability refers to how well the powder mixes in 12oz of water. We use the shaker bottle test. This would be your typical Blender Bottle with the spiral chrome ball.

Finally, we talk about value. Value is the combination of profile, effectiveness, taste and mixability in relation to cost. Another part of value are the competitors and other versions of pre-workout products on the market.

Ingredients Profile


In the age where there are so many pre-workouts on the market, you truly need to do something special to separate yourself. You can do this by providing effective dosages of common and not-so-common ingredients. RX’D does both.

We start with the clinically backed 6g dose of Citrulline Malate 2:1. If your Citrulline is 2:1 with Malate, the dosage is 6-8g. This helps with your muscle pump, which in-turn aids in recovery and growth. Then we get 2g of PeakO2. PeakO2 is from Compound Solutions. It is an expensive ingredient that has been proven to enhance performance through enhanced endurance and increased strength. This is the highest dose I have seen of this in a pre-workout on the market.

Beta Alanine is dosed at 2g. This is slightly lower than the clinically researched and backed 3.2g. Beta Alanine provides that tingly feeling, but it also contributes to improvements in your endurance and strength. Creatine HCl is also used at 2g. This is a typical dose of Creatine HCl (I see it around 3g sometimes), that aids in strength output. Betaine Anhydrous is dosed at 1.5g. Ideally we’d want this at 2.5g, but 1.5g is still acceptable. This aids in strength and power output. Taurine is the last ingredient used to help improve strength and it is dosed at 1g. Effective doses of Taurine range from 500mg to 2g.

Focus is a main point in pre-workouts. RX’D uses 300mg of Alpha GPC (yielding 150mg). I would like to see this at a full 300mg for A-GPC, but it is still a nice addition to improve “tunnel vision.” Caffeine, the ingredient you’ve been waiting for, is dosed at 250mg. An effective dose. We also get 125mg of Theacrine (yielding 75mg of TeaCrine). This is coupled well with caffeine. It acts much like it, except we don’t build a tolerance to it. This is around average for dosing given the caffeine amount.

Overall, a simple ingredient deck using one out of the box ingredient in PeakO2. A nice clean profile that is almost 100% effectively dosed.

core extreme nutrition rx'd label



Some will argue that the most effective pre-workouts are stim-heavy. That is not the case. The most effective pre-workouts are the ones that use effective dosages of proven ingredients. RX’D does that.

FI had one of our product testers run this, and this was his direct feedback:

With working out at 4am, I always take my preworkout on an empty stomach. With in a few minutes I can feel it kicking it. You get that light face burning feel and light hand tingles. But after starting to workout that fade,s but you get great focus and energy. Most of my workouts last about an 1 1/2 hours and, even after I’m done I still feel like I have plenty of energy to go well into lunch time. Each workout I’m left with a feeling of my muscles feeling full; I feel stronger with each lifting session. Overall it’s a solid pre-workout from what I normally take.

Solid feedback from a guy I see in the gym daily. He said it was one of the best he’s ever taken, and that’s a testament to the ingredient deck.


Bombscicle: (8/10)

The flavor on the container was Bombscicle. I think of the 4th of July popsicle when I think of that, don’t you? Here’s the feedback from the tester:

Honestly, it tasted just like Blue Raz. I’m not a huge fan on that flavor, but if I had to drink one I would choose this. To me, most Blue Raz flavors taste like cough medicine. This is actually enjoyable and drinkable.

Overall, it was a good tasting pre-workout that would have received a 7, but they reformulated the flavor to improve the taste to an 8.



This is a fairly large serving size of 17g. We’d expect this to mix more poorly than some of the lower serving sizes, but it did a really good job. Here’s your quote:

Mixing one scoop in 8oz of water and shaking for about 10-20 secs mixed it up pretty well. Every once in a while you would get some particles floating but nothing to make you feel like it was chalk in your mouth. I’ve had some pre-workouts where you shake it and it foams a lot. Once the foam settled your left with a ton of pre-workout you didn’t get. This did not do that. There was nothing left at the bottom of the shaker cup.

To be expected is to have some particles floating. A good mixing pre-workout.



The going rate now days on pre-workouts is about $2 per serving (a 20-serving effective PWO can retail for $40-$45). Core Extreme Nutrition RX’D is 30-servings retailing for $50. Listen, this is a value for most. Some will see the $50 price tag and get sticker shock. You need to realize that this is a 30-serving, damn near fully effectively dosed pre-workout. If you want quality you have to pay for it, CEN RX’D is exactly that.


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