Killer Labz Exterminator Review


  • Caffeine can be great for raising energy levels when cutting calories.


  • All ingredients contained in 1 big proprietary blend – so you don’t know the exact dosage of each ingredient.
  • Proprietary blends increase the risk of side effects (caffeine in dosages over 200mg per serving can cause jitters or energy crashes.
  • Contains Ephedra, which is extracted from the banned substance Ephedrine (equally likely to cause side effects).
  • Rauwolfia banned in UK without prescription (after causing harmful side effects).
  • 2-aminoisoheptane banned in competitive sports.
  • Hordenine reported to cause numerous side effects.
  • DMAA shown to raise blood pressure when consumed with caffeine

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Killer Labz Exterminator Review - LeanBulking

About The Product

Exterminator is a fat burner by Killer Labz. It costs $44.99 for 45 servings per bottle, and has a serving size of 1 capsule per day.

We prefer fat burners that offer 3-4 capsules spread throughout your day, so your body’s always topped up with fat burning nutrients. The only 1 serving supplements on the market should be pre-workouts.

Who are Killer Labz? 

Killer Labz are a supplements company based in the USA. They take pride in offering strong products, however, the ingredients list for Exterminator might show they’ve gone too far.

Let’s take a further look at what’s inside.

Exterminator Ingredients Explained

Exterminator by Killer Labz contains 7 ingredients – this is a good number of ingredients to have in a product, but the problem is that they’re all part of a proprietary blend.

What are proprietary blends? 

Proprietary blends are mixtures of numerous ingredients that’re shown to you as one quantity (in this case, 615mg).

This is bad, as no-one knows the exact dosages of each ingredient inside – and as caffeine can cause jitters and energy crashes in dosages over 200mg per capsule, Exterminator puts you at risk of suffering side effects.

Not only that, Exterminator contains a few banned ingredients. Our general rule is to stay away from banned ingredients (as they’ve usually been banned for causing harmful side effects).

Killer Labz Exterminator Ingredient List Review - LeanBulking

Here’s Everything You Need To Know:


When dosed correctly, Caffeine is one of our favorite fat burning ingredients. Basically, it’s shown to raise your metabolism and can provide energy boosts when you’re cutting calories.

So what’s the best dosage? Well, we like to consume 70-75mg Caffeine per capsule in a fat burner (the best fat burners come in daily servings split into 3-4 capsules per day).

This is a problem, as Exterminator only provides one capsule per day. As the overall quantity of the ‘Fat Exterminator’ proprietary blend is 615mg, there’s a chance there’s over 200mg caffeine in one serving, which can cause jitters or energy crashes.

The point is, no-one knows the dosages of ingredients inside proprietary blends, so you’re putting yourself at risk here.


Also known as DMHA, soccer fans in England will know this due to Mamadou Sakho being banned for taking this ingredient.

Basically, DMHA is banned in competitive sports – so you should stay away if you’re a high-level athlete.



Also known as DMAA, it’s believed to provide energy boosts similar to caffeine. However, here’s the problem: DMAA’s shown to raise blood pressure when consumed with caffeine.

As Exterminator contains both DMAA and Caffeine, you’re at risk of suffering from this side effect.


Hordenine is believed to promote fat loss and energy levels. However, no studies have proven it to work.

Not only that, it’s been reported to cause numerous side effects (see section below for more info).


This is one of the most concerning ingredients inside Exterminator. Basically, Ephedra is extracted from Ephedrine (Ephedrine’s been banned for causing harmful side effects, but Ephedra has been overlooked so far).

For this reason, companies are still able to include Ephedra in their supplements – and with people looking for the ‘strongest’ ingredients available, this looks good to them (but it’s not worth suffering side effects for, especially as there’s better options available).

Black Pepper Extract 

This is a bonus ingredient, rather than a key one. Simply put, Black Pepper Extract’s shown to improve the absorption rate of ingredients it’s consumed with.

However, it’s not a miracle pill – so it won’t make bad ingredients good. As most ingredients in Exterminator are bad, there’s not much use for Black Pepper Extract here.

Rauwolfia Vomitoria 

Also known as Indian Snakeroot, this plant is used to treat insomnia, high blood pressure and mental disorders. However, it’s been reported to cause numerous side effects (see section below for more info).

Killer Labz Exterminator Fat Burner Review - LeanBulking

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Side Effects

Exterminator contains numerous ingredients that can cause side effects. Even Caffeine, which is very safe when you know the exact dosage you’re consuming, is bad here as it’s part of a proprietary blend (meaning you’re not shown it’s exact dosage).

Basically, this is exactly the type of fat burner we avoid – we’ve experience bad side effects from consuming ingredients in Exterminator, and never recommend anyone to take them.

Here’s the potential side effects from taking Exterminator: 

  • Banned from competitive sports (DMHA)
  • Rapid Heartbeat (Hordenine & Ephedra)
  • High Blood Pressure (Hordenine & Rauwolfia)
  • Nausea (Rauwolfia)
  • Diarrhea (Rauwolfia)
  • Stomach Cramps (Rauwolfia)
  • Jitters (High dosage of Caffeine over 200mg per capsule)
  • Energy Crashes (High dosage of Caffeine over 200mg per capsule)

Exterminator Review Conclusion

Ultimately, Exterminator there’s only 1 key fat burning ingredient inside, which is Caffeine. The rest are reported to cause harmful side effects, and we recommend staying away from them – especially Ephedra, Rauwolfia, and Hordenine.

Even Caffeine in Exterminator can cause side effects, as it’s in a proprietary blend (meaning there could be a dosage higher than 200mg per capsule inside Exterminator). In fact, we refused to try this fat burner as we didn’t want to experience any side effects listed above.

For this reason, we can’t give Exterminator more than 1 star. We recommend taking a look at our Top 3 Fat Burner Supplements Page – to see the safest and most effective products on the market.

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