Vitamax Test SX-7 Black Onyx Review | Side Effects | Ingredients | Dosage |

Vitamax Test SX-7 Black Onyx testosterone review

From MuscleTech comes Vitamax Test SX-7 Black Onyx, a multivitamin, mineral, and testosterone boosting formula.

Containing over 40 ingredients with different effects, this product is a jack of all trades, master of none.

Some of the key ingredients come in ineffective doses, which brings up the question: “Will this product work?”

Find out the answer to this question, along with its potential side effects and benefits in this review!

Pros and Cons of

Vitamax Test SX-7 Black Onyx contains plenty of ingredients that are good for general health. But when it comes to boosting testosterone, it’s a disappointing show by MuscleTech.


  • Dosages of each ingredient clearly shown for you to see
  • Simple to take
  • Improves libido and general health
  • Contains boron and zinc which have an effect on testosterone


  • Key T-boosting ingredients underdosed – such as Vitamin D3
  • Contains magnesium oxide, which has very poor bioavailability
  • Tribulus Terrestris is shown to cause prostate enlargement
  • Missing key ingredients that boost testosterone, including DAA, Fenugreek, and Oyster Extract


Containing over 20 nutrients, along with various blends that boost testosterone, Vitamax Test SX-7 Black Onyx claims to:

  • Support Testosterone Levels
  • Increase Free Testosterone and Decrease Estradiol Within a Normal Range in 7 Days
  • Supports Athletic Stamina

We have to admit, these are some bold claims. But MuscleTech are well within their right to make them, as this product isn’t FDA approved.

To see if it can actually give you these benefits, we’ll need to look at the dosage and ingredients first.

Dosage | How To Use

You should take 4 tablets of Vitamax Test SX-7 Black Onyx with food, once per day.

This is a pretty straightforward and simple way to take a multivitamin, but not a testosterone booster. Let me explain why…

When a T-boosting ingredient enters your body, it stimulates your testes to produce higher amounts of male hormone, or in some cases, reduce estrogen. This process usually lasts for a few hours after you take a testosterone booster.

The problem is; if you only take 1 serving per day, your testosterone will get elevated for a few hours, and then return to baseline. As a result, you won’t experience any lasting benefits.

To keep your T-levels elevated for longer periods of time, you need a product that has at least 3 servings. The more servings it has, the longer the benefits will last.


Vitamin and Mineral Formula

There are over 20 vitamins and minerals inside Vitamax Test SX-7 Black Onyx. However, most of them have no direct effect on testosterone. For this reason, and not to annoy you with too much info, we’ll only cover the most important ones.

Let’s have a look:

Vitamin A

Vitamin A is shown to stimulate testes to secrete testosterone and reduce estrogen. However, it has no effects on people who aren’t deficient in it.

How can you tell if you’re deficient in Vitamin A? A rule of thumb is, if you’re eating any of these foods, it’s unlikely you’re deficient;

  • Carrots
  • Sweet Potatoes
  • Eggs
  • Broccoli
  • Butter
  • Kale
  • Spinach
  • Beef Liver

For example, beef liver contains 3x the daily amount of Vitamin A. And since this vitamin is fat-soluable, meaning its stored in your body for further use, it’s also possible to overdose on it.

Vitamin C

Studies have shown that 1,000-3,000mg of vitamin C taken before physical activity can reduce cortisol levels in the blood, which in turn positively affects your testosterone and immune system.

However, Vitamax Test SX-7 Black Onyx only contains 300mg of Vitamin C, not nearly enough to affect your testosterone levels.

Vitamin D

Vitamin D is one of the most important ingredients in any testosterone booster. Along with DAA and Oyster Extract, it’s possibly the king of T-boosting ingredients.

However, it requires the right dosage to affect your testosterone. What’s the optimal dosage, you ask? Studies say, anything above 3,000IU, with the optimal dose being around 5,000IU.

Vitamax Test SX-7 underperforms once again, containing a slim 1,600IU of Vitamin D3. As a result, you won’t experience its full benefits.

Vitamin B6

B vitamins are important for numerous functions in the body, including testosterone. Vitamin B6 stimulates androgen receptors in your body, signaling to your testes to produce extra testosterone. However, just like any other vitamin, it only gives benefits if you’re deficient in it.

And since B vitamins are abundant in most foods, it’s highly unlikely you’re deficient in them. The only two groups of people who could be deficient are vegans and elderly.


Magnesium is an essential mineral that regulates numerous functions in our body, including heart health, nerve functioning, and yes, testosterone production. It helps you stay relaxed, gives you more energy throughout the day, and is an all-around great addition to any T-booster.

However,  Vitamax Test SX-7 contains magnesium oxide, a form of magnesium with the lowest bioavailability. MuscleTech could’ve done better here.


Just like magnesium, Zinc is a mineral important for numerous functions in our body. It’s even more important for testosterone than magnesium. Deficiency in zinc is shown to cause low testosterone among other problems.

If you like to exercise a lot, there’s a chance you’re deficient in this mineral, as zinc is lost through sweat. For this reason, you want to supplement with enough zinc to avoid deficiency.

MuscleTech Vitamax Test SX-7 did a great job here, containing 30mg of Zinc Citrate. This is 200% of RDA, meaning you’re sure to get its full punch.

Test Booster Blend

Although Vitamax Test SX-7 contains a blend of ingredients, it’s not a proprietary blend. In other words, you know exactly how much of each ingredient is in this supplement.

This is a great job by MuscleTech, they show every ingredient clearly for you to see.

Now, let’s take a close-up look at the ingredients:

Boron Citrate

Boron is a mineral shown to promote natural testosterone levels.

While it can’t compare with the best T-boosting ingredients, it’s a great addition here.

Tribulus Terrestris Extract

You won’t find Tribulus Terrestris is any of the top-rated testosterone boosters, for a good reason.

It’s not only ineffective at boosting testosterone, studies also show that it can cause prostate enlargement.

Definitely not the safest of ingredients out there.

Saw Palmetto Extract

Saw Palmetto is believed to have a positive effect on your T-levels. It’s also told to be effective at suppressing prostate enlargement.

However, there are currently no studies supporting these claims. In other words, Saw Palmetto isn’t reliable at boosting testosterone. But that isn’t the worst part.

There are reports of Saw Palmetto Extract causing adverse side effects in users – including excess sweating, dizziness, nausea, and constipation.

For this reason, we recommend avoiding this ingredient.

Maca Extract

Maca is a well-known aphrodisiac and libido enhancer. It’s been used for thousands of years, so you know its completely natural and safe.

But studies show it has no benefits in regards to boosting testosterone.

Longjack Extract

This one is shown to be a potent aphrodisiac and fertility agent. Meaning it improves your sex drive and is good at increasing sperm count.

It’s also shown to be anti-estrogenic, meaning it can suppress female hormone in your body. Which, in turn, can promote testosterone.

Good job by MusclePharm here.

Rhodiola Rosea

Known for its cognitive benefits, Rhodiola can make you feel calmer and more focused at the same time.

But it has no direct effects on testosterone.


Gingko is another cognitive-enhancing ingredient which can promote blood flow to the brain, thus improving memory and other brain functions.

But, just like with Rhodiola, don’t expect any benefits for testosterone with this one.

Other Ingredients

Most of these ingredients are intended for general health, but have no effect on testosterone whatsoever. See for yourself:

  • Arjuna Extract – good for cardiovascular health, but no effects on testosterone.
  • Green Tea Extract – a great ingredient in a fat burner or pre-workout, but not really in a testosterone booster.
  • Japanese Knotweed Extract  helps with bowel movement, and that’s about it.
  • Alpha Lipoic Acid – A potent anti-oxidant agent, but no effects on testosterone.
  • Ginger Extract – good for general health, helps prevent vomiting and nausea.
  • Cinnamon Extract – improves blood glucose and insulin resistance, a great addition to a fat burner, but not a T-booster.
  • Blackberry – loaded with vitamins, but not really necessary as Vitamax already contains plenty of them.
  • Acerola – boosts your immune system and helps with digestion, this might indirectly affect testosterone by lowering cortisol.
  • Choline – found in eggs, important for brain and liver function.
  • Enzymes (Amylase and Papain) – promotes a healthy digestion, however, a pointless ingredient in a testosterone booster.
  • Black Pepper Extract – improves the bioavailability of other ingredients, making them more effective.

Side effects

You’ll be happy to hear that most users reported no side effects from using Vitamax Test SX-7 Black Onyx. However, there are some people who reported:

  • Humming in ears
  • Increased blood pressure
  • Vomiting
  • Nausea

This is understandable – Vitamax Test SX-7 Black Onyx contains over 40 ingredients, which is a lot! Different people are sensitive to different ingredients, so be sure to start with a lower dose, perhaps 2 tables, to assess your tolerance to this product.

What Others Say

Vitamax Test SX-7 Black Onyx testosterone review

“Feel like crap after taking it, I have even cut the serving in half.” – Wilfredo Mercado (Amazon Customer)

“I’m not really sure, the placebo could be strong in this one. I am going to purchase again. I stacked it with plasma muscle. Definitely been more motivated to lift and have been getting significantly stronger. Could be placebo, but either way, it’s working.” – Amazon Customer

“I have been taking 4 pills per day and I feel nothing at all. no benefits what so ever. $70 plus bucks for nothing.” – Frank Rendon (Amazon Customer)

“I think it definitely worked, but my blood pressure increased and there was a hum in my ears–both of which went away when I stopped using the product. I’m not sure if there’s a definite connection, but I will talk to my doctor about my findings.” – Amazon Customer

Conclusion |

Vitamax Test SX-7 Black Onyx is a product that gives you a little bit of everything, but it isn’t particularly effective in any specific area. Such as boosting testosterone. As I’ve already said; a jack of all trades, master of none.

It’s beneficial for general health, it can improve libido, and it even has zinc and boron which are good for testosterone. But it’s missing D-Aspartic Acid, Fenugreek Extract, Oyster Extract, and other key T-boosting ingredients.

For this reason, we can’t really put Vitamax Test SX-7 Black Onyx in the same sentence with the best testosterone boosters currently on the market.

If you’re looking to improve your general health and perhaps have more energy and libido, Vitamax Test SX-7 Black Onyx is the way to go. It can help cover any deficiencies or lack of nutrients if you don’t eat enough fruits or vegetables.

But for anything more than that – such as boosting testosterone – there are much better options out there!

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At MaleTestosteroneBooster, it’s our aim to help you get the most out of your life by helping you boost your testosterone levels. We all know what it’s like to feel suboptimal in the bedroom, the gym, and in everyday life when your confidence is lacking. This is why I’ve put together the below guides to help you reach your goals! Why not check them out, you may find just what you’re looking for.


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