N.O.x Test™ SX-7® Black Onyx™ | GNC

MuscleTech™ N.O.x Test™ SX-7® Black Onyx™


Item # 802233


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Size: 120 Caplets

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Product Information


Hybrid Muscle Pump Formula & Powerful Test Amplifier*
Hybrid Muscle Pump Formual & Powerful Test Amplifier*

SX-7® researchers have engineered a dual-function formula backed by real human clinical studies on its core ingredients. N.O.x Test™ SX-7® Black Onyx™ is an intense nitric oxide and muscle pump inducing formula with the added benefit of boosting testosterone. Using studied key ingredients, N.O.x Test™ SX-7® Black Onyx™ delivers a unique experience that is completely stackable with other pre-workouts or testosterone boosters.
  1. L-citrulline – An amino acid that is a precursor to arginine, shown to reach superior peak plasma arginine levels than a larger dose of L-arginine.
  2. L-arginine – An amino acid shown to increase blood flow and vasodilation to support muscle pumps.*
  3. Quercetin – A bioflavonoid shown to increase key markers of nitric oxide production and reduce a vasoconstricting factor.*
  4. Red wine fruit extract – Supplies proanthocyanidins − a key polyphenol − which emerging research shows may support the production of nitric oxide.*
  5. Boron – Shown in human clinical research to increase free testosterone and decrease estradiol in just 7 days. Free testosterone is the most bioavailable form of testosterone and supports the musclebuilding process.
  6. Rhodiola crenulata and Ginkgo biloba – This combination of ingredients has been shown in a human clinical study to maintain peak testosterone-to-catabolic-hormone ratio and enhance performance.
  7. Brassica oleracea and Bladderwrack extract – Supplying diindolylmethane and fucoxanthin.

Label (click image to enlarge)


Take 1 serving (4 caplets) once daily. Do not exceed 4 caplets in a 24-hour period. Read the entire label before use and follow the directions provided.
Contains milk ingredients.


For healthy adult men only. Consult a medical doctor before use if you have a medical condition and before starting a diet or exercise program. KEEP OUT OF REACH OF CHILDREN.

Other Ingredients

Dicalcium Phosphate Dihydrate, Microcrystalline Cellulose, Hydroxypropylcellulose, Stearic Acid, Coating (Hypromellose, Titanium Dioxide, Polydextrose, Talc, Maltodextrin, Medium Chain Triglycerides), Croscarmellose Sodium, Silicon Dioxide, Magnesium Stearate, Acesulfame Potassium
Distributed by Iovate Health Sciences U.S.A. Inc. 1105
North Market Street, Suite 1330, Wilmington, DE 19801.
Made in the U.S.A. from international ingredients.

Nutrition Facts

Serving Size  4 Caplets
Servings Per Container  30

Amount Per Serving     % DV

Calcium 180 mg   18%

N.O. Pump Matrix  0   **
L-citrulline (as L-citrulline and PepForm® L-citrulline peptides)  1500 mg   **
L-Arginine  1000 mg   **
Quercetin Anhydrous  200 mg   **
Red wine extract (as Vitis vinifera)(fruit) Standardized for proanthocyanidins  150 mg   **
Anabolic/Anti-Catabolic Complex  0   **
Rhodiola extract (as Rhodiola crenulata)(root) Standardized for salidrosides  771 mg   **
Broccoli (as Brassica oleracea)(sprout) Supplying diindolylmethane  250 mg   **
Boron citrate Supplying 5% boron  200 mg   **
Bladderwrack extract (as Fucus vesiculosus) (whole plant)  50 mg   **
Ginkgo extract (as Ginkgo biloba) (leaf) Standardized for terpene lactones  5.4 mg   **

** Daily Value (DV) not established.


4.8 / 5.0
31 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Awesome Product to Add to Your Stack!
I received this product for free as part of the MuscleTech Product Test Team and I have been very pleased after almost three weeks of use. I added this product to my stack while cutting down and it has delivered great pumps during workouts that seem to never go away. Within about 1.5 weeks of use, my muscle definition and vascularity was greatly improved and the ingredients included have noticeably increased my test levels (great for the gym and the bedroom). Four pulls one time per day is very easy and they are easy to swallow. My first bottle was free but I have already ordered a second bottle for another month. Well worth the price!
February 5, 2016
Great Product
This is a great product for naturally stimulating a boost in testosterone levels safely. I have had no adverse side effects and have been having great workouts!

Personal Trainer
Fitness Model
Degree in Exercise Science
February 3, 2016
Nice Pump!
4 Pills before my workout and I've got some swollen veiny muscles in about 30 minutes. I felt like I added some real solid power to my workouts while stacking this with a few other products like an AA and a thermo-genesis supplement. There is no taste or bad smelling pill aroma. I would recommend this to anyone who is serious about adding some strength and power to your workouts. I love that you can stack this product with other supps. and not feel over jittery or sick. I will buy this again.
January 27, 2016
New Era Of Test and Pumps!
This is a wonderful combination that made my workouts a total revamping in the way I perform at the gym. I was pumped almost immediately at my warm ups and the overall raw power increased. No doubt that N.O.c Test is the evolution of new supplements that can get you far away from the pack. I would defiantly recommend it to mid and advanced athletes, because the workouts are going to be 100% more productive that they ever had before.
February 6, 2016
A 2-in-1 product worth consideration
I received this product from the team at MuscleTech to try out in exchange for an honest review. At the time of this review, I have taken N.O.x Test for 9 days. One thing that I definitely appreciate is the fully disclosed ingredient label - you know exactly what is in one serving of four capsules. Also, as shown on the product's webpage, the ingredients are backed by published scientific research and are not bogus ingredients with no effect. Personally, I prefer to add this to a pre workout for added effects, specifically the pump aspect since it does have citrulline, arginine, and quercetin. In regards to the anabolic side of the product, obviously it won't turn you into a jacked and shredded specimen after one bottle...the effects are much less than that. Strength appears to have increased on several lifts by a rep or two and I have noticed an increase in weight in others. No signs of aggressiveness outside the gym, but inside the gym is a different story (a good thing!). These are two things i look for in a product like this, and it definitely delivers. The caplets are not big at all. The one star deduction is only for the price, which is a bit too much in my opinion especially if you are not a GNC member. Hopefully this review helps prospective purchasers.
February 4, 2016
Great with Preworkout
I've been taking this first thing in the morning w/ my preworkout and have noticed a significant increase in pumps. The pump also seems to last throughout the day. I notice it doing simple tasks during the day that I never felt previously before using NOx Test.
February 3, 2016
Great pumps!
I take 2 pills an hour before hitting the gym and the pumps gets real good during my session! Been a lot more vascular than when I started so things are going well for me.
February 3, 2016
Great pump !
I've been using MuscleTech N.O.x Test SX-7 Black Onyx for two weeks now and I'm really enjoying it !

I take it pre workout and noticed I had a increase in pump and vascularity. The pump stays throughout the entire workout and is very noticeable. It's tough finding a good pump product but MuscleTech really did it this time with the added dose of L-Citriline and L- Arginine.
February 5, 2016
Excellant N.O.
Had opportunity to try this product and its everything the reviews said I stack it with the rest of the Black Onyx line and its great... I defiantly recommend the SX-7 Black Onyx Line
February 7, 2016
Big Pumps
I started taking this with my pre workout and have really noticed a bigger pump when lifting. It's awesome to feel and see something work. MuscleTech made another great product.
February 6, 2016