Test Your Limits Testosterone Booster Review


The marketing for the TNT Supplements’ range says “be prepared to experience the most explosive range of sport supplements on the market today!”

The hype continues with the company’s description of Test Your Limits.

Claims to be:

  • “THE strongest legal testosterone support supplement available today!”
  • “RAMMED full with maximum effective doses of each scientifically studied ingredient”
  • 100% natural
  • Clinically proven
  • A product that can “blow your test levels through the roof!”

In the blurb for Test Your Limits, TNT also shouts “you won’t find any half-measures here!”

With all these explosive claims in mind, we’re eager to see whether this product tests our limits (or our patience)…

About The Company

Before preparing for this review, we hadn’t heard of TNT Supplements. But a little digging reveals the company offers everything from BCAAs, to pre-workouts, creatine, and of course T-boosters.

While we can’t find much about TNT Supplements or the guys behind it, the company boasts endorsements from a number of “hand-picked” athletes. These include Rushane Thomas, Allan Gouiuck and Brett Leahy.

The Ingredients and How They Work

Test Your Limits’ ingredients don’t suggest the T-booster is anything special.

It contains a few high-quality nutrients and T-boosting staples, alongside some ingredients we’re surprised to find.

See for yourself:

Test Your Limits ingredients

D-Aspartic Acid

We always say we’d never trust any testosterone booster that doesn’t contain D-Aspartic Acid (D-AA).

Why? Because this awesome amino acid is proven to boost T-levels, enhance fertility and increase muscle strength and size.

D-AA performs its magic by releasing the Luteinizing hormone (LH), which helps your body produce the growth hormone (necessary for increasing muscle mass).

Foods rich in D-AA include eggs, dairy, meat and poultry, as well as barley, buckwheat and oatmeal. But while you can get D-AA in your diet, studies show taking it in a supp is a great way to ramp up your testosterone.

Does Test Your Limits contain enough D-AA?

Over the years, we’ve found 1600-2300mg of D-AA to be optimal in a testosterone booster. But with just 1516mg of D-AA, Test Your Limits doesn’t contain enough of the amino to give you the best results.


ZMA is a trademarked blend of Zinc, Magnesium and Vitamin B6. In other words, it’s just a fancy way of describing nutrients you’d hope to find in any good testosterone booster.

“ZMA” Trademark

“ZMA” is a trademark of SNAC Nutrition. This means other brands have to pay to include the term on their ingredients lists.

While we can’t say for sure why (or whether) TNT paid to use “ZMA”, we prefer brands and products to put openness and honesty before marketing hype. So instead of paying to use the trademark, it’s possible the company could’ve passed any savings on to the customer.

In our opinion, 10-30mg of Zinc, 100-200mg of Magnesium and 5-7.5mg of B6 work together to provide optimal results in a T-booster.

So while this supp contains enough Zinc (25mg) and B6 (7mg), there’s too much Magnesium (250mg) in Test Your Limits.


We DO NOT advise taking Sarcosine.

While a few keyboard warriors on forums talk about this compound’s supposed T-boosting effects, medical research focuses more on its links to prostate cancer.

At this time, no-one knows for sure whether taking Sarcosine causes cancer. But ongoing research suggests it may act as a co-carcinogen, which means it could enhance the effects of compounds that do cause cancer.


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Fenugreek is a main ingredient in of some of the best testosterone boosters on the market.

Clinical tests show this potent antioxidant has the power to raise T-levels and promote the free flow of testosterone around your body. It also enhances your sex drive and helps you strip fat.

Fenugreek works by inhibiting the Sex Hormone Binding Globulin (SHBG), which can rob testosterone of its anabolic power.

However, Test Your Limits contains 412mg of Fenugreek – which is more than four times the optimal amount (90-100mg).

Beta Ecdysterone

Part of a family of Ecdysteroids, Beta Ecdysterone derives from the sex hormones of insects.

A number of animal studies suggest the molecule behaves in a similar way to anabolic steroids.

Despite this, the one study on the subject shows Beta Ecdysterone has no significant effect on T-levels in humans.


Phosphatidylserine is a dietary fat found in human neural tissue and is vital for brain function.

There is some evidence to suggest it improves memory and cognition in elderly people. It’s also thought Phosphatidylserine can reduce cortisol in the blood, which in turn could help balance hormone levels.

Still, the limited research on the subject suggests oral supplementation of Phosphatidylserine does not boost T directly.


5-Methyl-7-Methoxyisoflavone (widely known as simply ‘Methoxyisoflavone’) is a common ingredient in bodybuilding supplements.

But although Methoxyisoflavone has been used in supplements since the 1970s, there’s no meaningful evidence to show the chemical increases muscle mass or testosterone (as widely claimed in the fitness industry).

And while there have been several studies on the effects of the Methoxyisoflavone for this purpose, none of this research is published in peer-reviewed journals.

As we only recommend taking proven ingredients, it’s disappointing to see yet another dud in a supplement.

Vitamin D3

Vitamin D3 is an essential nutrient proven to pump up testosterone, raise energy and strengthen your immune system. Much more than just a vitamin, D3 is actually a hormone that your skin naturally absorbs via sunlight.

But modern life decrees you may not get enough D3. This could be due to working indoors, or it could because you live in a country that doesn’t see much sun. As a result, it’s an important ingredient in any T-booster.

We’ve found 5000 IU to be the perfect dose of D3 – this is the exact amount you’ll find in two or three of the best testosterone boosters we’ve tried.

But with 62.5 Ug of D3 (2500 IU), this supp gives you just 50% of the D3 you need for the biggest gains.

TNT Test Your Limits bottle and box

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Side Effects

Most of the ingredients in Test Your Limits are safe.

However, Sarcosine is currently under investigation for its links to prostate cancer. With this in mind, we advise caution before taking this amino-acid derivative in any supplement.

Pros and Cons


  • Contains some high-quality ingredients
  • Cheaper than some premium T-boosters


  • The “ZMA” trademark may be a marketing ploy to describe common ingredients
  • Doesn’t contain enough D-Aspartic Acid
  • Uses too much Fenugreek (4 x optimal amount)
  • Phosphatidylserine may not directly influence T-levels
  • No concrete proof Methoxyisoflavone boosts testosterone
  • Beta Ecdysterone works in insects, but not in humans
  • Sarcosine has no T-boosting effects and MAY cause cancer
  • Only available to buy in the UK


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Testosterone Booster Supplements Here


Review Conclusion

We often see otherwise good supplements spoiled by one or two dubious ingredients – and TNT Supplements’ Test Your Limits is no exception.

We welcome D-Aspartic Acid (D-AA), Vitamin D3 and Fenugreek in any T-booster due to their proven ability to boost T and enhance muscle gains in the weight room.

But Test Your Limits doesn’t contain enough D-AA or D3. It also employs too much Fenugreek to help you achieve the biggest gains.

Unproven ingredients

We always advise avoiding unproven ingredients. And in the case of this supp, there is limited evidence Phosphatidylserine and Methoxyisoflavone boost testosterone.

Meanwhile, research suggests Beta Ecdysterone increases T in insects, but not in humans.

But of all the ingredients in this supp, we were most dismayed to see Sarcosine.

Not only is there zero proof of its T-boosting power; Sarcosine is currently being investigated as a possible cause of prostate cancer.

Unfortunately, we fear this product is another example of a T-booster that promises great things, but fails to stand up to scrutiny.

For this reason, we can’t recommend Test Your Limits. Instead, make sure you spend your money on a testosterone booster with ONLY proven ingredients.

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