Ultra Nox | GNC

GNC AMP Ultra Nox


Item # 988711

Product Information




  • Maximizes N.O. Production & Blood Vessel Tone*
  • Supports Endurance & Performance*


Nutrition Facts
Serving Size  4 Tablet(s)
Servings Per Container  30

Amount Per Serving     % DV

Vitamin B-12 (as Cyanocobalamin) 2.4 mcg   100%

Nitrosigine® (Arginine Silicate Inositol)  1.5 g   **
L-Citruline  1.5 g   **
Oxyjun® Terminalia arjuna Bark Extract (30% Polyphenols 120 mg)  400 mg   **
Agmatine Sulfate  250 mg   **

** Daily Value (DV) not established.
Other Ingredients
Mica, Microcrystalline Cellulose, Croscarmellose Sodium, Hydroxypropylcellulose, Silica, Hydroxypropyl Methlycellulose, Polydextrose, Magnesium Stearate, Vegetable Source, Titanium Dioxide (Mineral Whitener), Stearic Acid Vegetable Source, Talc, Medium Chain Triglycerides, FD&C Blue #2 lake, FD&C Red #3 Lake, Ethylcellulose, Triacetin, Diacetylated Monoglycerides, Oleic Acid , Polyethylene Glycol
Label (click image to enlarge)

How To Use

As a dietary supplement, take four tablets daily with 8 fl. oz. of water or your favorite sports beverage 30-60 minutes before your workout. On non-training days, take first thing in the morning.
Use only as directed., Do not exceed recommended daily intake., Consult your physician prior to using this product if you are pregnant, nursing, taking medication, or have a medical condition. Discontinue use two weeks prior to surgery., Keep out of reach of children.
Store in a cool, dry place.
Distributed by:
General Nutrition Corporation
Pittsburgh, PA 15222


4.6 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Ultra Nox
I would definitely recommend this product to anyone who is looking to increase there strength, endurance and vascularity. Great product for the price.
July 21, 2019
3 weeks ago
I just love the way my muscle are full during my workout
Best pump I never had good focus
July 10, 2019
1 month ago
Works great, no stomach problems or dizziness while using.
June 1, 2019
2 months ago
Awesome will continue to purchase
May 31, 2019
2 months ago
They give me a good workout pump!
April 6, 2019
4 months ago
Great Pumps
I can't speak to this as some user's are saying it gave them energy, but focus I can definitely agree on. This + my choice of pre-workout make for a rather volatile combination.

You always hear people talk about "one more rep", but this product, and one other N.O. product that I forgot the name of, work great. I feel this definitely provided better flexibility and strength during the last rep in each of my sets where I could really squeeze the muscle I was focusing on and manage to get the remaining one or two out.

I'd recommend it if you're looking for a good nitric oxide / pump booster to your workouts.
March 30, 2019
Great product!
March 26, 2019
3 months ago
Works as stated.
I am 61 and started lifting again about 3 months ago. I received a sample in the mail. The directions say to take 4 per work out. The 1st I tried just 1 and noticed a sustained energy level. The next I tried 2 about 20 minutes prior to lifting. 2 Is plenty for me. I believe it gives me an additional 30 minutes of high level energy. I will buy again.
March 21, 2019
4 months ago
I work out at 515 in the morning and before I got this in my pro pack and started taking it I was tired all day long. Since then I am more awake and focused all day.
March 18, 2019
Felt Nothing
I used this when I got it as a sample in my Pro Box. The plus side is because its Stim free, no adverse effects. But I also felt no positive effects. I felt nothing and my lift sessions were the same as any other day.
March 7, 2019
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Browse 9 questions Browse 9 questions and 11 answers
Can stack with bcaa or pre workout?
A shopper on Dec 15, 2018
does this have caffeine in any form? I'm staying away from supplements that have it . .
Azzedine A on Apr 6, 2018
BEST ANSWER: The Product is Stimulant free No caffeine and no jitters
How does this compare to NO 3?
Kevin H on Nov 4, 2018
BEST ANSWER: 10 times better in the gym and giving you a extra boost in the bedroom
Can I use this with ore work out powder?
Kenneth C on Mar 1, 2019
BEST ANSWER: Ultra Knox is stim free, so you can take it with any other pre workout drink that has caffeine for additional boost. I usually do that.
Has anyone used this who is also on Levothyroxine for hypothyroidism? I used to use Nitrix years ago before my diagnosis and would like to get on this supplement. There does not seem to be a lot of information regarding pairing Nitric Oxide boosters, such as this, with hypothyroid medications.
A shopper on Dec 13, 2018
Can women take ultra nox?
Sally S on Mar 5, 2019
BEST ANSWER: Yes, women can use this product. Just be sure to read the label warnings
My 15 year old son takes this product. Is this product safe for teens? If not, why not?
A shopper on Mar 20, 2019
BEST ANSWER: I have not had a problem with this product. The product lives up to its promise. Just make sure that you follow the directions and your son should be fine.
Does this product irritate the Prostate?
Sean D on Mar 3, 2019
BEST ANSWER: No I have never had any problems with that, and I've been using that product for quite some time.
Can you take this with mega men vitamins?
Jeff S on Apr 11, 2019
BEST ANSWER: Yes sir, don’t see why not. I’d be careful taking with certain preworkouts, though.