Zantrex Black Review: Does It Really Work?

By Anthony Dugarte, M.D., C.S.C.S
Updated on: Mar 4, 2020

Zantrex Black is proposed to enhance both energy and weight loss through a unique blend of ingredients.

Carrying extra weight can place you at a higher risk for chronic medical conditions like diabetes and cardiovascular disease. For many, losing weight is often easier said than done.

While diet and exercise are mainstays for any weight loss plan, Zantrex Black may be a beneficial addition to your regimen.

According to their website, by taking 2 softgels with water 150 minutes before breakfast, lunch, and dinner, you can expect to:

  • Quickly boost your energy
  • Rapidly lose weight loss
  • Control your appetite
  • Elevate your mood

These certainly sound like highly desirable effects, but are they possible?

In this article, we’ll help you determine if Zantrex Black is the safe and effective weight loss supplement you’ve been missing.

Zantrex Black Active Ingredients: Do They Work?

Zantrex Black’s ability to deliver these benefits is allegedly related to the unique blend of ingredients.

You can expect the following packed into every 2 softgels:

Niacin (30mg)

Proprietary Blend (1,160mg)

  • Yerba Mate
  • Guarana Extract
  • Caffeine
  • Damiana Extract
  • Green Tea Extract
  • Kola Seed Extract
  • Schizonepeta Extract
  • Black Pepper Extract
  • Rhodiola Crenulata Extract
  • Asian Ginseng Extract
  • Maca Extract
  • Cacao Extract
  • Black Tea Extract

While they do not provide the quantity of each specific ingredient in the blend, the secret behind the proposed effects is related to the caffeine content of this supplement – about 300mg per serving.

We’ll focus on the caffeine content to help you get a better understanding of what Zantrex Black can offer.

Can Caffeine Content Deliver the Proposed Effects?

In addition to including caffeine itself, Zantrex Black offers 5 additional ingredients that contain this stimulant: yerba mate, guarana, green tea extract, kola seed extract, and cacao extract.

The caffeine offered in each of these ingredients amounts to about 300mg in every 2-softgel serving. For your reference, this is about 3x the amount of caffeine included in an 8oz cup of coffee.

Thus, you’d take in 900mg of caffeine daily when Zantrex Black is taken as directed.

Caffeine has several reported benefits like boosting memory, increasing alertness, enhancing athletic performance, and even reducing the risk for some cancers.

The caffeine-containing ingredients in Zantrex Black are intended to boost your energy and help you lose weight.

The effects of this stimulant have been widely studied.

A recent review of 34 studies detailed some of the immediate benefits that caffeine has related to athletic performance. Doses ranging from 3 to 6mg/kg body weight improved vertical jump, sprinting speed, and performance during agility tests.

In healthy subjects, 3mg/kg of caffeine given before physical activity increased the number of sweat glands and oxidized more fat when compared to those that didn’t receive caffeine. These effects were smaller in obese women, however.

This study found weight loss was more effectively maintained in those that consumed more caffeine.

A recent review of 13 randomized trials concluded that caffeine intake might promote reductions in weight, BMI, and body fat.

The proposed energy and weight loss effects seem to be supported at doses comparable to those found in Zantrex Black.

You should always start with a more comprehensive weight loss plan that includes diet and exercise. The use of a dietary supplement alone would not offer all of the available benefits of implementing healthy lifestyle changes.

Is Zantrex Black Safe?

While many of these ingredients have been safely studied individually, their combination may increase your risk for side effects and toxicity.

This is best illustrated in a 2012 case report. A 38-year-old woman taking Zantrex-3 (200mg of caffeine per serving) for 2 months experienced blurred vision and seizures. These symptoms were resolved after discontinuing use.

Though this is just one case, use can be risky.

The FDA states that rapidly consuming 1,200mg of caffeine can cause seizures. While you’ll fall under this number when taking Zantrex Black as directed, the addition to your typical coffee, soda, or tea intake can put you in an unsafe range.

Also, 400mg daily is considered the safest use of caffeine – daily Zantrex Black use alone can more than double this number.

Consuming too much caffeine often results in restlessness, nausea, agitation, rapid heart rate, and unsafe increases in blood pressure.

For these reasons, it’s best to avoid Zantrex Black or similar stimulant-containing supplements. Always ask a physician before use and never consume them in ways other than what is recommended.

Cost and Where to Buy

You can pick up 84 softgels of Zantrex Black directly from their website or from Amazon for $39.99 or $19.87, respectively.

When used as directed, one bottle will last you 14 days. You’ll have to double the pricing to get through an entire month.

This product ships free from both Zantrex and Amazon.

Zantrex also offers a no-hassle guarantee that is not constrained by a time limit. According to their site, simply contact Customer Service Hotline at 1-800-898-5153 and ask for a Return Merchandise Authorization (RMA) number.

Place the RMA on the outside of your package and return to Returns Dept. 5742 Harold Gatty Drive, Salt Lake City, UT 84116.

Are There Any Alternatives?

There are a number of stimulant-containing supplements available. A simple internet search will reveal many options.

Trans4orm from Evlution Nutrition offers a 2-month supply of this supplement for $29.99 or 2 for $40 at Each capsule provides a blend of B vitamins, extracts, and caffeine-containing ingredients.

Hydroxycut Hardcore Elite from Muscletech is another stimulant-containing dietary supplement. It similarly offers multiple forms of caffeine. At GNC, it is $34.99 for a 25 day supply.

Again, as these products may be harmful, diet and physical activity are a better first step for weight loss.

The Bottom Line

The many benefits of caffeine have been extensively studied. There is ample support for the energy-boosting and weight-loss promoting effects alleged by Zantrex Black.

Reviews for Zantrex Black are fair.

More than 500 users rate it 3.9-stars at Amazon. Happy customers report rapid weight loss, sometimes even with taking much less than the recommended dosing. Those unsatisfied with the supplement report side effects like rapid heart rate and stomach pain.

Nonetheless, stimulant-containing supplements can be dangerous. Zantrex Black, when used as directed, more than doubles the safest daily limit for caffeine. Adding other sources of caffeine (coffee, soda, etc.) can place you at even greater risk.

Implementing healthy lifestyle changes should be your first step in your weight loss journey. If you are interested in Zantrex Black or similar products, do not use them without speaking to your doctor.

Customer Reviews

Start your review of Zantrex Black:
  • 49 Customer Reviews
  • 45% Recommend This Company
2.8 out of 5
5 star: 30% 4 star: 10% 3 star: 6% 2 star: 10% 1 star: 42%

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  • Great product

    Overall Experience:

    I love this product! I pave roads for a living and I take 2 in the morning and 2 mid-day and it gives me the energy I need to get through work! I also have been losing a lot of weight while gaining muscle! I absolutely love this product, and highly recommend it if you need that extra energy boost and rapid weight loss! I would give this product 100 stars if that was a thing!

    Bottom Line: Yes, I would recommend this to a friend

  • Hives, rapid heart rate, lightheaded

    • By Sherry W.,
    • Virginia,
    • Sep 10, 2019
    • Verified Reviewer
    Overall Experience:

    I just bought these today and I took two this evening before dinner...within 10 minutes of taking them I felt like I was on fire! My face was blood red, my arms and my chest were broke out in hives, my blood felt like it was pounding through my body and I was on fire. It has been about an hour and a half and it is eased up some now. I still feel like my heart is racing but the redness has gone away, however, I will definitely not be finishing the rest of my bottle and I would not recommend this to anyone else, as typically I have no allergies to anything and this is the first time I’ve ever had a reaction like this to any pills.

    Bottom Line: No, I would not recommend this to a friend

  • Hives

    • By Jill B.,
    • Illinois,
    • Jun 18, 2019
    • Verified Reviewer
    Overall Experience:

    I have taken this pill in the past with no problems. Today within 10 minutes I had broken out in hives, face, arms, and hands. So bad that I went to convenient care and my blood pressure was extremely high. Loaded me up with Benadryl and still 7 hours later, my arms are still red, raised, and itchy. Face and neck are better but still itchy. Start on steroids tomorrow.

    Bottom Line: No, I would not recommend this to a friend

  • Feels great

    • By Joey A.,
    • Fort Worth, TX,
    • Feb 17, 2019
    • Verified Reviewer
    Overall Experience:

    I was looking for something to help lose at least 10lbs, 20lbs would be better. I researched for days and read about Zantrex Black and gave it a try. Good price, so I figured why not, the only thing I have to lose it I have RA, Hashimoto's and suffer from depression, so I'm tired all the time. I drink coffee all day. I have been taking Zantrex Black for two days and I FEEL AMAZING! I have not had the need to drink coffee, and it makes me thirsty, which is good because I don't drink a lot of water. I suffer from constipation as well and this product fixed that! Two days in a row I "went."

    I have not had any rashes, headache, stomach issues...all is great! I hope I see weight loss results soon!

    Bottom Line: Yes, I would recommend this to a friend

  • Zantrex Black

    • By Karen K.,
    • Vancouver, WA,
    • Sep 5, 2018
    • Verified Reviewer
    Overall Experience:

    I always seem to have 10 pounds to lose. I have taken almost everything on the market - no wonder weight loss remedies is a multi-billion dollar industry. I find that my appetite is curbed, I do indeed have more energy AND as an added, but as an unintended benefit, it has helped me cut down on my smoking. I used to smoke 4-5 cigarettes a day. Now, I barely smoke 2, and while I am smoking, they no longer are satisfying. I have ordered 2 more bottles. Within the next month, not only will I have lost my 10 pounds, I've lost 3 after the first week, but I will probably not be smoking anymore. Thanks so much, Zantrex Black!

    Bottom Line: Yes, I would recommend this to a friend

  • Fantastic product

    • By Mark L.,
    • Grand Island, FL,
    • Jul 22, 2018
    • Verified Reviewer
    Overall Experience:

    I have type 2 diabetes and I have not been able to lose weight. I tried this, taking two pills, but it was too strong for me. I now take one pill in the morning and one in the evening.

    I tried other products and they did nothing, but this really works. I have lost 22 pounds in two months. The main thing to note as that it really cuts down on my hunger and how much I eat. I don't notice any boost in energy, but I bought this to lose weight and it's 10000% great.

    I can't thank this company enough for having such a great product out there; it saved my life.

    Bottom Line: Yes, I would recommend this to a friend

  • Do not waste your money!

    • By Jennifer K.,
    • Pittsburgh, PA,
    • Jul 20, 2018
    • Verified Reviewer
    Overall Experience:

    Though this product kept me wakeful, it also turned me into an insomniac. Though it curbed my appetite perfectly, I lost only ONE pound in one month, AND I was not eating any unhealthy foods NOR WAS I in excess of 2000 calories a day.

    This product made me itch all over my body within 20 minutes before I ate. Try something else. This company is only trying a different scheme to make money off of the hopeful.

    Bottom Line: No, I would not recommend this to a friend

  • Will never take it again!

    • By Danielle,
    • Mississippi,
    • May 3, 2018
    • Verified Reviewer
    Overall Experience:

    I would not recommend this to anybody. The headache is not worth it, OMG, I just took some Tylenol and it eased away within 20 minutes. Don't take this unless you want a BAD headache. I felt shaky, it didn't give me any energy, it decreased my hunger, but heck, that probably gave me a bad headache too. I don't think anything on the market is safe. The hospital said that weight loss pills don't work, they just give you bad side effects, and to me, if you gotta deal with crap like that, it ain't worth it.

    Bottom Line: No, I would not recommend this to a friend

  • Allergic reaction

    Overall Experience:

    I had a horrible allergic reaction three times, and the last two were really bad. I finally narrowed it down to it being caused by the Zantrex Black. Heart palpitations, extreme nervousness, turned beat red with a rash. My head felt like it was on fire. Thank goodness I had Benadryl on hand for two bad episodes; I thought I was going to die. I won't be ever taking this product again.

    I had to rate, so I gave it one star only because that was the lowest I could rate it at.

    Bottom Line: No, I would not recommend this to a friend

  • Indecisive on product claims

    • By Kelly,
    • Ohio,
    • Mar 24, 2018
    • Verified Reviewer
    Overall Experience:

    I started Zantrex Black yesterday. I felt perfectly fine all evening besides not really being able to sleep and was extremely dehydrated even after drinking five bottles of water, which from what I have been reading seems to be normal.

    I woke up this morning and took two pills on an empty stomach. Twenty minutes later I felt really hot and flushed like I was going to pass out, then I was extremely nauseous with bad cramping pains and my cheeks and nose are beet red. After it subsided, I felt fine for about three more hours, but then to my surprise, it happened all over again.

    I'm pretty sure it is the Niacin in it that is making people feel this way. It is meant to flush out your system quickly and make you sweat out toxins. As far as weight loss goes, I do feel lighter, but I think it may be from the extra water intake and cutting out high calorie caffeinated drinks. I only recommend this product to individuals who actually eat three times a day, otherwise, you will be dealing with some nasty side effects.

    Bottom Line: No, I would not recommend this to a friend

  • Amazing, true story.

    Overall Experience:

    I tried Hydroxycut and cleanses and slim this and slim that. I started weighing 154 lbs and am a 5ft 5in woman, so curvy to start. In two weeks with NO diet and light exercise, I have lost 10 lbs. So I am now 144 and counting. I am taking six a day. No negative side effects.

    Bottom Line: Yes, I would recommend this to a friend

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Zantrex Black Review: Does It Really Work? A Detailed Look