Zantrex 3 Side Effects -

Zantrex 3 Side Effects

Most of the side effects associated with Zantrex 3 are identical to those associated with excessive caffeine consumption.

The reason why is simple.

One serving of Zantrex 3 will provide you with more caffeine than you’d obtain from 3 cups of coffee! Obviously then, caffeine-related side effects may be quite prominent in some people. It’s important to note that there’s so much caffeine in this product that’s there’s a real danger of taking too much without really knowing you are doing so. Making the assumption that you’re taking an non-prescription weight loss pill and therefore can disregard label instructions with impunity can be a big mistake – you’ll always want to start with the lowest dosage possible to assess your tolerance and never take more than directed.

It’s also important to note that caffeine has many of the side-effects associated with the now banned ephedra (nervousness, increased blood pressure, heart palpitations, and so on) and although common in many foods (coffee, chocolate, various soft drinks, etc., etc.) may not be for everyone.

It’s also possible that because of its high caffeine content, you may experience caffeine withdrawal symptoms when you stop taking Zantrex 3.

While regular caffeine use can lead to mild physical dependence, it does not cause withdrawals on the scale of illegal drugs.

Also, please recognize that the side effects associated with Zantrex-3 will also be common to other caffeine-based fat burners — which is to say the vast majority of the products featured on this site.

According to Medline Plus

“Excessive caffeine intake can lead to a fast heart rate, excessive urination, nausea, vomiting, restlessness, anxiety, depression, tremors, and difficulty sleeping.

The effect of caffeine on health has been widely studied. In particular, the effects of caffeine on fibrocystic breast disease, heart and blood vessel disease, birth defects, reproductive function, and behavior in children has been closely examined. The American Medical Association Council on Scientific Affairs says that moderate tea or coffee drinking likely has no negative effective on one’s health, as long as the person lives an otherwise healthy lifestyle. However, the organization emphasizes moderate caffeine use.

“Abrupt withdrawal of caffeine may cause headaches, drowsiness, irritability, nausea, vomiting, and other symptoms. Reduce caffeine intake gradually to prevent any symptoms of withdrawal.”

Here are but two examples of the sort of side effects some people are experiencing with this product. Special thanks to Brandon and Lori for sending their comments…

I have serious concerns over Zantrex 3 and its side effects. First, I should be clear in my past experience with fat burners. I took ripped fuel for approximately 4 years in doses ranging from 2-5 pills per day. I am familiar with the increased heart rate, irritability and other effects of ephedra.

With that said, I have serious concerns about Zantrex 3. I attempted to take this pill on 2 separate occasions and was instantly thrown into a panic attack, a vicious sweat, and an itching rash brought on by the niacin. My throat closed up and my heart raced. If I did not have an emergency 1mg Klonopin in the house, I am certain that I would have gone to the hospital.

Why did I take it again if I was so scared the first time?

Because I wanted to lose weight. I not been able to locate a favorable review of this product and, in many instances, have read accounts of similar reactions.

The niacin content is extremely high in this supplement. Further, the high caffeine content is outright insane.

I am not worried about my own well-being since I will never take this again. I am, however, concerned that someone is going to get hurt by this supplement.

Brandon (

I think Zantrex-3 should be illegal! I too tried to take it on two separate occasions.

The second time I tried to take it I also went into a panic attack and had the most horrible feeling in my whole body! I just wanted it out of my system at that point. I can’t imagine that the effect that it has on someone else would be much different. I think it is a horrible weight loss product that should be taken OFF the market!

Lori Worthey (

We welcome you to read the complete Zantrex 3 review, which is available here!

Author: Paul

Paul Crane is the founder of His passions include supplements, working out, motorcycles, guitars... and of course, his German Shepherd dogs.


  1. I have been taking Zantrex 3 for 2 weeks and other than not feeling tired at work, I have had no side affect. Some days I am still tired, with drinking coffee, taking zantrex and a 5 hour energy.

    I don’t think this product works bc I have not lost a pound in two weeks, I will not by this product again.

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    • Try the blue bottle that work for me some years ago trying the red bottle now if no results will go back to the blue bottle

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    • I just took Zantrex 3 for the 2nd time as well and my whole body broke out in a red rash with extreme heat, I feel like I’m legitimately high. I have not had anything to drink other than water and no food containing caffeine. This 2 pill dose is excessive in my opinion

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      • Thanks for sharing your experience, Alicia.

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  2. Been taking zantrex 3 and it crashed in my body with caffeine doctors can’t find no problems but I haven’t been the same chest pain head pain body hurt and its been 4 months ago

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  3. I took zantrex 3 because I am very uncomfortable with my body. I’m 5’10 and I weigh 160 lbs. I took 2 at lunch time and instantly afterwards I developed a terrible itching rash all over my neck and body. I felt terrible all afternoon and I finally fell asleep about 9. I woke up at 2 am vomiting vigorously. Its 2 days after this happened and I still have no appetite. DO NOT TAKE ZANTREX 3!!!

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  4. I took zantrex 3 for a full week. I have lost eight pounds. I stopped taking it today because I literally haven’t slept more than 5 hours all week. Today, I decided I wouldn’t take it, and I took a 3 hour nap which was much needed! I threw up a few times, and had severe migraines in the am, but I feel great now that the day is through. I think I will still take the pills I have left but I will only take 1 a day instead of 6. Taking it before a workout is great because it gives such energy that you can push yourself even further. I would recommend this product, but definitely not the full serving. I think 1 a day will be the appetite suppressant and energy boost I need for workouts. Seriously, DONT take the full serving. Not sleeping for a week definitely was not enjoyable. My body/mind is so tired!

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    • Janelle, thanks for sharing your comments. This stuff is loaded with caffeine. I’ve experimented with a lot of fat burners over the years, including dozens of ephedra based products, but I couldn’t tolerate this product either.

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  5. I have been taking zantrex 3 for 2weeks now,the first week wasn’t bad,I had a slight head ache when taking 2pills a day,the 2nd week I took 3pills and the next morning I woke up with very bad chest pain! It’s painfully to inhale deeply, when expanding my lungs. It feel as if my chest was used as a punching bag. I don’t know if it’s from zantrex3 but I’m not going to use this supplement anymore.

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    • Stopping this product is a good idea, given those concerning side effects. Thanks for sharing your experience!

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  6. I just bought a new bottle today thought I would give it a try I used to take Zantrex-3 for about a year-and-a-half starting in 2006 I lost 40 lb I had to work 7 a.m. to 4 p.m. so when I took my first break I would take two capsules at about 10 a.m.. I had a lot of energy throughout the day I was always on my feet working in retail loved the energy I just watched what I ate and did not eat past 6 p.m. and went to bed at 11 p.m. no problems up at 6 a.m. to go to work the next day now I am on a different schedule since it’s been 10 years I only work part-time but I’m going to try to lose 20lb hopefully in a few months thought I would give it a try again I loved it then hopefully I will now

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