Ultra Nox

by GNC AMP Advanced Muscle Performance · tablet or pill · 120 tablets

On the market (NIH)
DSLD label 224622
Serving 4 tablets
30 servings

Ultra Nox by GNC AMP Advanced Muscle Performance lists 5 ingredients, 5 with an amount per serving of 4 tablets, such as 2.4 mcg of vitamin B12, 1.5 g of nitrosigine, 1.5 g of L-citrulline and 400 mg of oxyjun terminalia arjuna bark extract. Its current label entered the NIH Dietary Supplement Label Database on June 24, 2020.

What is in Ultra Nox?

Each row as the label prints it, per serving of 4 tablets. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Ultra Nox: Supplement Facts rows against the market (DSLD label 224622, January 2026 release)
Ingredient	Amount	% DV	Among products listing it
Vitamin B12as CyanocobalaminVitamin B-12 (Form: as Cyanocobalamin)	2.4 mcg	100%	91% of 14,425 products listing vitamin B12 give more (median 36 mcg).
Nitrosigine	1.5 g		Higher than 50% of 274 products listing arginine silicate inositol (median 1.37 g).
L-Citrulline	1.5 g		68% of 1,209 products listing citrulline give more (median 3 g).
Oxyjun Terminalia arjuna bark extractas PolyphenolsOxyjun Terminalia arjuna bark extract (Form: 30% Polyphenols Note: 120 mg) PlantPart: bark Genus: Terminalia Species: arjuna	400 mg		50% of 86 products listing terminalia give more (median 425 mg).
Agmatine Sulfate	250 mg		84% of 514 products listing agmatine give more (median 750 mg).

Source: NIH ODS Dietary Supplement Label Database, label 224622 (entered June 24, 2020), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

91% of the 14,425 products that print an amount of vitamin B12 list more than its 2.4 mcg of vitamin B12 (median 36 mcg).
84% of the 514 products that print an amount of agmatine list more than its 250 mg of agmatine (median 750 mg).

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

The products whose ingredient lists overlap most with Ultra Nox's, rare ingredients counting for more.

Pump OneNutraOne 3 shared, 55% alike
Pump Sour Apple CandyCore Nutritionals 3 shared, 49% alike
Pump Peach MangoCore Nutritionals 3 shared, 49% alike
Pump Pineapple StrawberryCore Nutritionals 3 shared, 49% alike
Pumpageddon UnflavoredFrontline Formulations 3 shared, 37% alike
Vigor Blue RaspberryLeviathan Wellness 3 shared, 36% alike

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions: Stack with your existing pre-workout; Directions: As a dietary supplement, take four tablets daily with 8 fl. oz. of water 30-45 minutes prior to exercise. On non-training days, take first thing in the morning with water. See usage benefits for additional suggestions and information.
Warnings: Warning: 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, under 18 years of age or have a medical condition.; Discontinue use two weeks prior to surgery.; Keep out of reach of children.
Allergens and what it does not contain: GNC AMP Ultra NOX delivers the stim-free fuel needed to achieve superior performance, without the jitters.; Enhanced with clinically studied Oxyjun to support cardiovascular performance, GNC AMP Ultra NOX is designed with non-stimulant, superior fatigue-fighting fuel to drive your workout.; If it's on our boxes, then it's in our bottles. Full dosing, full transparency and no proprietary blends.; No sugar, no artificial flavors, no preservatives, sodium free, no wheat, gluten free, no soy, no dairy.
Storage: Store in a cool, dry place.

Source: label statements in DSLD label 224622.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Croscarmellose Sodium, Hydroxypropylcellulose, Silica, Hydroxypropyl Methylcellulose, Polydextrose, Magnesium Stearate, Mica, Titanium Dioxide, Stearic Acid, Talc, Medium Chain Triglycerides, FD&C Blue #2 Lake, FD&C Red #40 Lake, Ethylcellulose, Triacetin, Diacetylated Monoglycerides, Oleic Acid, Polyethylene Glycol.

How many labels does Ultra Nox have?

One label is on file, entered on June 24, 2020.

Label 224622 (current) Entered June 24, 2020 · on the market · 120 tablets

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names General Nutrition Corporation (distributor), Pittsburgh, PA. All GNC AMP Advanced Muscle Performance products.