Test HD Black Onyx® | GNC

MuscleTech® Test HD Black Onyx®


Item # 403786

Product Information



Extreme Results Testosterone
  • Testosterone
  • Vitality
  • Reduce Cortisol

Research-Backed Ingredients. Clinical Doses. Full Transparency. All Power.
New Test HD Black Onyx® is the most advanced testosterone-enhancing pill. It's built with the scientifically validated ingredients shown to reduce cortisol and boost free testosterone.

Boost Free Testosterone in 7 Days -
Test HD Black Onyx® features four separate ingredients backed by separate human clinical studies shown to boost testosterone or combat cortisol - most competitors have none! Just one of those ingredients is shown to increase free testerone and decrease estradiol in a little a 7 days.

Testosterone is Critical for the Strength Building Process
Test HD Black Onyx® is the only testosterone-boosting formula to combine clinically researched doses of Sensoril® Ashwagandha, Primavie® Shilajit and D-aspartic acid, plus the much sought-after ingredient Longjack. Many competitors using these ingredients only include supportive doses or hide the amounts in proprietary blends, making the other guys inferior to our fully disclosed formula. Only Test HD Black Onyx® is engineered with full doses of key ingredients engineered to boost free testosterone levels. Free testosterone is the most active form of testosterone, and is critical to initiating the muscle and strength-building process, as well as supporting performance.


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

Amount Per Serving     % DV

Vitamin B6 (as pyridoxine hydrochloride) 2mg   100%
Folic Acid 200mcg   50%
Vitamin B12 (as cyanocobalamin) 1mcg   17%
Zinc (as Zinc Gluconate) 30mg   200%

Test Extreme Matrix  0   **
   D-Aspartic Acid   **
   Boron citrate Suppyling 10mg boron   **
   Primavie® Shilajit extract Standardized for 50% fulvic acid   **
   Sensoril® AShwagandha extract (as Withania somnifera)(root and leaf) Standardized for 5% withanolides   **
   Longjack extract (as Eurycoma longifolia)(root)   **
   Asian ginseng extract (as Panax ginseng)(root) Standardized for 5% ginsenosides   **
   Stinging nettle extract (as Urtica dioica)(root)   **
   Safed musli extract (as Chlorophytum borivilianum)(root) Standardized or 5% saponins   **

** Daily Value (DV) not established.
Other Ingredients
Coating (Titanium dioxide, Polyethylene glycol, Talc), Microcrystalline Cellulose, Dicalcium Phosphate Dihydrate, Croscarmellose Sodium, Stearic Acid, Silicon Dioxide, Magnesium Stearate
Label (click image to enlarge)

How To Use

Take 1 serving (4 caplets) once daily with water. Do not exceed 1 serving (4 caplets) in a 24-hour period. Read the entire label before use and follow directions provided.
not intended FOR use by persons under 1 Do not use if pregnant or nursing Not intended for use by persons under 18. Do not use if pregnant or nursing. Discontinue use 2 weeks prior to surgery. Consult a medical doctor before starting any diet or exercise program or if you have medical condition. This product should not be consumed for more than 4 consecutive weeks with a 2 to 4 week period between cycles. KEEP OUT OF REACH OF CHILDREN.
^This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Store in a cool dry place.
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.


4.7 / 5.0
27 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Best Test Booster out there!
I have tried them all and this one is spot on!
April 30, 2019
Works well
I really feel so much better after using this. Works better than others I have tried.
March 9, 2019
6 months ago
Good Test Booster
One of the better Test boosters I have had. I usually do boosters through an 8 week period. I take the Test HD for the first 4 weeks since is has the D-asparic acid and then take the Test HD Lean Build for the last 4 weeks. Similar to P6 combo Black and Red that cellucor use to have. I also stacked tribulus to it but only took half the serving of the tribulus.
February 26, 2019
Best test booster at GNC for the best value only one that is better is the T10 !
February 21, 2019
No Changes.
Did not see any changes after using it for a month .
February 20, 2019
6 months ago
Ka-Boom !!
I've tried several different Test Boosters, so far this is the best I've used. I work out at least 3 times a week (weights primarily) and can tell the difference in my energy level, workouts are longer, more focused.
February 16, 2019
3 months ago
No results noticed after 2 weeks of using this product!
I have been taking this product for about 2 weeks now and have not really noticed a difference. After reading the reviews, I was expecting to notice a difference by now. I will continue using this product, as directed, for another week or two and if I do not notice a difference, I will switch to a different product
February 6, 2019
4 months ago
Great test booster.. I would highly recommend this product for anyone looking for a edge.
December 20, 2018
5 months ago
Best test booster on the market
I'm recovering from several major surgeries and tried this test booster to help me get back in shape and was definitely happy with my results. My muscle fatigue was decreased, recovery time increased and I was not only lifting the same amount before my surgeries, I actually increased my weight on several key lifts. I have tried other test boosters in the past, but this truly jumpstarted my recovery process and helped me get back on track.
November 5, 2018
Test Through the Roof
This product is a great test booster. I felt like I was able to get leaner during the 30 days I was on it vs 30 days prior with no change in exercise or diet, besides the weight increase that I gained. I also enjoyed the increase in the bedroom! Would recommend to anyone interested.
November 2, 2018
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Browse 1 question Browse 1 question and 2 answers
I bought my first bottle yesterday do I have to take 4 at a time or can I take them 2 At a time say an hour apart?
A shopper on Mar 9, 2019
BEST ANSWER: I'd think you can take them whenever through the day as long as you do the four capsules for a full serving. However, I recommend taking them all at once since that's what the label says. Making sure you have water or something to wash them down with definitely helps as you probably know the capsules are rather large.