Zantrex Black

Updated May 14, 2019.
Published May 20, 2015.

Zantrex Black is marketed as a fat burner, but not many of the customer reviews mention this as a feature. Most users have noted that it gives you a buzz and increases your energy (unsurprising, as it is quite stimulant-heavy). Whilst some of the ingredients are known to be good for weight-loss, such as the combination of green tea and caffeine, there is also an element of the unknown about the rest of the cocktail. People have also mentioned a decrease in appetite from taking Zantrex Black. Overall, it feels like the negatives outweigh the positives.


  • Will probably provide added energy as described


  • Potentially dangerous ingredients in unknown quantities
  • Too many genuine customer reviews that mention side effects
  • Unproven cocktail of ingredients probably will not cause weight loss
Zantrex Black
Zantrex Black is a high-energy weight loss supplement, that claims to give you high-velocity weight loss. According to some customers, this US diet pill may cause side effects, but many people reckon it is worth it for the benefits.

We take an in-depth look at Zantrex Black to find out more.

Zantrex Black Overview

What you need to know about Zantrex Black

Zantrex Black is a fat-burning diet pill that may help you lose weight by increasing your energy levels and by reducing your appetite by making you feel too on edge to eat.

Zantrex Black contains numerous ingredients that may help increase the speed of the metabolism and as a result burn fat faster than usual. The ingredients list includes caffeine as well as some other ingredients, which also contain caffeine such as yerba mate, kola, guarana, black tea, and green tea.

What are the side effects of Zantrex Black?

Zantrex Black comes with a real risk of side effects and many people have mentioned side effects in customer reviews.

The product advertising mentions adverse effects to caffeine including nervousness, irritability, sleeplessness, and rapid heartbeat.

Other potential side effects may include: headaches, nausea, vomiting, breathlessness, mood changes, high or low blood pressure, itchiness, burning sensation on skin, skin rash, and allergic reaction.

How much does Zantrex Black cost?

Zantrex Black is available from some retailers such as Walgreens. You can also buy Zantrex Black direct from the product website. A container of 84 soft gel capsules costs $39.99.

Shipping is an additional $8.00 to US addresses.

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Zantrex Black Key Features

Zantrex Black may help you lose weight by increasing your energy levels, and by reducing your appetite by making you feel too on edge to eat. This is a well-trodden path of fat burners, and it does not suit everybody. However, many people enjoy this effect, so this supplement will interest those who are looking for it.

Zantrex Black contains numerous ingredients that may help increase the speed of the metabolism, and as a result, burn fat faster than usual. The ingredients list includes caffeine as well as some other ingredients, which also contain caffeine, such as yerba mate, kola, guarana, black tea, and green tea.

Evidence suggests that green tea is effective for increasing the speed of the metabolism when combined with added caffeine, so this looks to be a promising combination.

Zantrex Black Key Points

  • Made for Zoller Laboratories – a Utah based supplements company
  • One in a range of three Zantrex supplements
  • Each bottle contains 84 capsules

Zantrex Black also contains some known aphrodisiacs – Damiana leaf and Maca root. Interestingly, nobody has mentioned this sex life boosting effect in the extensive customer feedback, or maybe they are just not telling!

Damiana is sometimes used in legal high equivalents to cannabis, because inhaling the natural leaf can cause a slight “high”.

Other ingredients include Asian ginseng – known as an adaptogen because it has an unspecified way of working, but appears to improve mood and wellbeing, cocoa bean extract – which is high in theobromine (a stimulant), and Rhodiola crenatula – a succulent plant extract that according to limited animal testing, may be effective for improving physical working capacity or endurance.

How to Take Zantrex Black

Take two softgels with a full glass of water, 15 minutes before main meals.

For a significant energy boost: Take one or two softgels as needed.

Do not exceed 6 softgels in any 24-hour period.

Use in conjunction with any sensible diet and exercise program.

Individual results will vary.

You are also warned not to take Zantrex Black in combination with other Zantrex supplements.

The two final ingredients are black pepper extract – known to increase the absorption of other ingredients, and therefore make them more effective, and the scarily named Schizonepeta flower extract, also known as Japanese catnip. This is used in traditional Asian medicine as a treatment for colds and flu.

Although some of the ingredients in Zantrex Black are unusual, a good point about this supplement is that it does not contain any of the usual fat burning ‘nasties’ such as synephrine. That said it may cause side effects and it will not suit you if you are sensitive to stimulants, especially caffeine.

The exact formula is unknown because ingredient amounts are hidden under a proprietary blend, so individual quantities are not provided. The product information states that each serving contains 300mg of caffeine.

Zantrex Black Concerns:

  • The side effects seem very extreme. People may get seriously ill from using this supplement
  • The diet pill industry is unregulated and just because this supplement is on sale, does not mean it is safe
  • Will it really help you lose weight long term? There is no real evidence that it will

Zantrex 3 Black is manufactured in the USA for Zoller® Laboratories, who are based in Salt Lake City Utah. The company specialise in non-ephedra weight loss stimulants.

There are three Zantrex products in the range: Zantrex 3 High Energy fat burner (red bottle), original Zantrex 3 (blue bottle) and this one, Zantrex 3 Black. These are all fat burners, and there seems to be very little difference between Zantrex Black and Zantrex Original. However, Red Zantrex seems to be slightly weaker. We have also reviewed Zantrex Skinny Stix.

What does Zantrex Black claim to do?

Zantrex Black has four key features:

  • New Accelerated Rapid Release Formula
  • High Velocity Weight Loss*
  • Extreme energy… Fast*
  • Maximum Potency Liquid-Filled Softgel

Otherwise, apart from health warnings regarding the high caffeine content, there is very little information about this supplement. There is no explanation about any of the individual ingredients.

Does Zantrex Black work?

If you are looking for a stimulant that reduces your appetite and keeps you awake, this supplement will probably fit the bill. It contains a range of different stimulants, and it appears to be a very noticeable effect for most people. Sometimes with horrible consequences.

However, we question this as an effective weight loss method. It is not safe to put your body under this stress, and once you stop taking the tablets any weight you lose will undoubtedly be put straight on.

Few of the feedback comments actually mention weight loss. Although some users talk about a reduction in appetite, the major part of the comments relates to the energy buzz, the side effects, or both. It does not look safe.

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Zantrex Black Ingredients

Zantrex Black is a fat burner diet pill. Each serving is equal to two soft gel capsules. We cannot provide a full ingredients breakdown, because most of the formula comes under a proprietary blend.

  • Niacin (30mg): Also known as vitamin B3, this vitamin is important for heart health and is known to reduce cholesterol levels if taken at high doses, although side effects can make this a problem. The recommended daily amount for adults is 35mg. However, take too much and it can cause facial redness and itching. Source

Zantrex®-3 A Proprietary Blend 1160mg 

  • Yerba Mate (leaf) Extract
  • Trimethylxanthine: Clinical name for caffeine, but otherwise the same as you find in your ordinary cup of coffee. Has an energy-boosting stimulant effect that can wear off once the body becomes accustomed to use. Caffeine affects people differently, with some people having a very high tolerance due to coffee use. The average cup of instant coffee contains around 75mg of caffeine.
  • Gurana: Seed extract which contains high levels of caffeine.
  • Damiana (Turnura diffusa var. aphrodisiaca) (leaf) Extract: This plant extract comes from Mexico where it grows as a shrub. It is sometimes used as an aphrodisiac and sometimes smoked for a mild euphoric buzz. There is no real evidence that it will help weight loss. However, it contains chemicals that may affect the brain and central nervous system. Source
  • Green Tea (leaf) Extract: Green tea can be effective for weight loss, because it can help increase the speed of the metabolism. It is a powerful source of antioxidants ECGC (epigallocatechin gallate), which has a direct effect on fat burning. According to one clinical test, ‘Green tea has thermogenic properties and promotes fat oxidation beyond that explained by its caffeine content. The green tea extract may play a role in the control of body composition via sympathetic activation of thermogenesis, fat oxidation, or both’. Source
  • Kola (seed) Extract: The Kola Nut belongs to the cocoa family, and scientists have found that it boosts metabolic rate. However, it also boosts the heart rate if taken in too high a dose. It behaves in a very similar way to caffeine. Source
  • Schizonepeta (flower) Extract: Although a common name for this plant extract is Japanese Catnip, this ingredient is used in traditional Chinese medicine. It is mainly used to treat the common cold, and it does not appear to have any application for weight loss. Source
  • Black Pepper (fruit) Extract: The chemical ingredient of black pepper is Piperine, and this may have an effect upon the bioavailability of the other ingredients. Some evidence suggests that it can enhance effects.
  • Rhodiola crenulata (root) Extract: Although Rhodiola Rosea (roseroot) often shows up in supplements and is believed to increase stamina, closely related plant Rhodiola Crenulata has undergone even less clinical testing than its better-known relation. Limited testing on rats suggested that a combination of the two types may help increase stamina, but it lacks adequate safety information. Source
  • Asian Ginseng (root) Extract: Also called Panax Ginseng, this Chinese herbal remedy is well known as an adaptogen – it may help reduce stress and increase wellbeing. However, it can be unpredictable because it contains a lot of chemicals. In the West, it is used as a stimulant. In the East as something to calm you down. It may lower blood sugar levels and it can affect heartbeat slightly. May cause interactions.
  • Maca (root) Extract: South American plant root, which is believed to have aphrodisiac qualities. Rich in trace minerals and amino acids. When tested on animals they displayed enhanced sexual activity, and Maca extract is often used to make a drink that is popular in Peru because of the sexual enhancing effects.
  • Cacao (seed) Extract: The active ingredient of cocoa extract is Theobromine. It can have a stimulant effect if taken in sufficient quantities. It can increase the heart rate and give you a short-lived buzz, and is sometimes used in medicine to widen blood vessels and treat coughs.
  • Black Tea (leaf) Extract: This type of tea is derived from the same plant as green tea, but has undergone more processing. This means it does not have the same high levels of antioxidants contained in green tea. It is the same as the black tea that we drink.

Zantrex Black Side Effects

The effects of this supplement will vary from person to person. However, most people will notice the stimulant effect of the caffeine – the serving size is equal to around four cups of instant coffee. Added to this there are stimulants that work in a slightly different way, such as theobromine, ginseng, rhodiola, and kola.

We are concerned that many of the ingredients in Zantrex Black lack evidence for long-term safety, and without a full ingredients list, it is hard to gauge the effects of the non-caffeine ingredients.

Although the ingredients are derived from natural extracts, Zantrex Black comes with a real risk of side effects, and many people have mentioned side effects in customer reviews.

The product advertising mentions adverse effects to caffeine including:

  • Nervousness
  • Irritability
  • Sleeplessness
  • Rapid heartbeat

Other potential side effects may include:

  • Headaches
  • Nausea
  • Vomiting
  • Breathlessness
  • Mood changes
  • High or low blood pressure
  • Itchiness
  • Burning sensation on the skin
  • Skin rash
  • Allergic reaction

One customer experienced a serious allergic reaction:

I had to go to the hospital after taking this… My entire body turned beet red and my heart started beating uncontrollably, my lips turned purple, started having a hard time breathing, and passed out. I would suggest to ask your doctor before taking it because you never know if you could be allergic to the ingredients or not. It turned out I was and I needed to get a shot to stop the swelling. But for my husband it worked fine. He didn’t have any weird side effects so I guess he’s not allergic.

Many customers have mentioned sensitivity to niacin. One customer liked the added energy but was unable to take the pills.

It gives you LOTS of energy! I don’t think I have ever had this much energy ever but second day I took these my body had rashes every where, felt like my skin was burning.

Many customers have reported similar experiences.

Zantrex Black comes with health warnings provided. It is important to ensure that you follow the advice to consult your doctor before taking.

Caution: Consult your physician before use if you are taking caffeine-containing medications or if you are sensitive to stimulants. People sensitive to Niacin (Nicotinic Acid) may experience flushing of the skin that is generally mild and transient. Do not exceed suggested daily serving. Not for use by individuals under the age of 18 years. Do not use if pregnant or nursing. Consult your physician before use if you are taking a prescription drug, or have a medical condition.

Zantrex Black Customer Feedback

There are plenty of customer reviews for Zantrex Black. Some people like the energy boost that these pills provide. One lady uses this for energy alone:

Like this product, but I don’t use it for weight loss; I work night shift twelve hour shifts (I’m an ICU nurse) at a busy heart institute, where you really need to be alert and critically think. I can’t afford to make a stupid mistake from sleepiness…

Takes away appetite gives me energy. No shakes.

Is a typical positive comment. Some positive comments also mention side effects,

This product works for me. I am already hyped and this adds an extra 3 boost to my energy level, however for the first 10 minutes of taking this my body burns and itches. So I normally take it an hour or 2 before my work out.


Personally I really like when I can feel the effects of a diet pill, let’s me know it’s working. I want high energy, my heart pumping, breaking a sweat and to not feel as hungry. For me, they did that 100%.

Not all comments are as favourable,

This product is terrible. I took two pills and after thirty minutes my body go extremely overheated and heart began beating very fast. 5 hours later and I still could not get my heartbeat back to normal. I was unable to sleep for a very long amount of time and was very nauseous.

Other customers have experienced allergic reactions,

The first day I took this I took 1 and seemed to feel nothing. The next day I took 2 after I ate lunch I felt very hot, my face began swelling and my lips looked like I’d just had implants put in. I felt very sick. Not recommended.


I ended up in the E.R after taking these. My whole body was coved with rashes and whelps everywhere. whole body felt like it was on fire. my heart beat was so fast. NEVER AGAIN.

Zantrex Black Money-Back Guarantee

Buy direct from Zoller and you are covered by a 30-day guarantee. The conditions state,

Because no product or program will work for everyone, all Zoller® Laboratories formulations are backed by our 100% money-back guarantee. Simply stated, if you are not satisfied with any Zoller Labs formulation just return it to the place of purchase within 30 days.

We advise you to contact customer services before you return your unwanted supplements.

Where To Buy Zantrex Black

Zantrex Black is available from some retailers such as Walgreens. You can also buy Zantrex Black direct from the product website. A container of 84 soft gel capsules (between 21 – 42 days supply) costs $39.99.

Shipping is an additional $8.00 to US addresses.

Be aware that if you sign up to the advertised VIP program to receive a discount on shipping, you will be agreeing to an auto-ship program. The information states,

Cancel at any time. Future orders will be automatically billed & shipped every 30 days for just $31.99.

You can also buy Zantrex Black via from a choice of sellers. 1 container of 84 capsules costs around $19.88 plus shipping. You can buy Zantrex black from Amazon UK from various sellers. One container of 84 capsules costs around £35.16 plus shipping costs.

Watchdog Verdict

Zantrex Black will undoubtedly have an effect. You will probably notice enhanced energy levels or an unpleasant chemical buzz depending on your tastes and if this stimulant effect is what you are looking for, then this supplement will work.

However, we are concerned about the ingredients. The side effects and the lack of long-term safety information about some of them. This supplement may have an unpredictable effect and some users have experienced reactions that have caused them to be hospitalised.

Our opinion is that this supplement will do nothing to cause long-term weight loss. It may provide a temporary loss of appetite which may help short term but once you stop taking the pills you will probably put it back all back on again in yo-yo style.

However, our main reservation is one of safety. We think this supplement looks pretty dangerous, so there is no way we would take it ourselves or recommend it for anyone else. It is an easy decision. We do not recommend Zantrex Black to our readers.

How does Zantrex Black compare to Phentaslim?

Criteria Zantrex Black Comparison Phentaslim comparison
Clinically Proven Ingredients
Side Effect Free
Positive Customer Reviews
24/7 Support
Money-back Guarantee

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

Have Your Say

4 comments on 'Zantrex Black'

  1. I have no known health issues except migraines. I am a 41 yr old female who just wanted to lose those 20 extra hard to get off pounds. I took 1 pill and my head started tingling and then my skin started burning from my face down my entire body. Will not take again.

  2. I took two yesterday morning and my body got so hot and red “ it last about 1 hour “ I never Felt That before “ can I keep taking it and will it do that ever time I take them ? I’m kindly scared to take them again “

  3. I started using this product may, 2015 I’ve lost 66 pounds so far. We are now on November 18,2015 I’m still loosing weight! It worked for me. I take 1 pill every 6 hours 3 a day. I’ve never took 2 at once! I love this product! Only side affect is vomiting. Especially when I eat take out or fast food!


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