Updated: 05/17/2016 - Website operated by Leptigen

PhenTabz Review - Does This Fat Burner Work? Are ingredients and side effects deal breakers?

Editor's Review: 3.5 / 5.0
PhenTabz Review

There’s quite a buzz about Phentabz, so we dug deep into the ingredients, side effects, scientific research and customer service. Additionally, we jumped into hundreds of consumer comments and reviews. We then condensed and summarized to give you the info you need.

EDITOR'S TIP: Substitute PhenTabz with a proven fat burner such as Leptigen for better results.

What You Need to Know

First off, Phentabz is a diet pill containing caffeine, DMAA and synephrine. The recommended dose is one capsule per day, not to exceed two capsules and this supposedly assists with weight-loss. One benefit of the capsule is ease of use.

The product was introduced in 2001 by Gentech Pharmaceuticals. The company also sells the supplement under the banner of Lexium International. You can purchase it on the official website, but we couldn’t find it available anywhere else. We do like that the company has been in business for more than 10 years, but read on…

Ingredients Unsafe – “FDA Says Yes?”

The first concern for us was Phentabz ingredients. “Caffeine is considered a safe and effective weight-loss supplement,” said our Research Editor. “But, when a diet pill contains a banned substance like DMAA, there could be an issue.”

According to the FDA, “DMAA, especially in combination with other ingredients such as caffeine, can be a health risk to consumers. Ingestion of DMAA can elevate blood pressure and lead to cardiovascular problems ranging from shortness of breath and tightening in the chest.”

It’s also important to note, “DMAA-containing dietary supplements are illegal and their marketing violates the law. Based on the scientific information reviewed by FDA, DMAA is not a dietary ingredient.”

Scroll below for one of the best products we’ve seen over the last year.

Side Effects – “A Major Concern”

Based upon some customer comments, the adverse reactions with Phentabz can be severe. “I have not experienced weight loss yet, but there are side effects like feeling edgy and jittery and going to sleep at night has been difficult,” said a consumer.

“The only side effect was that it was making me jittery,” offered a dieter.

“I get these hot sweaty episodes with a heavy weight feeling on my chest, and it gets hard to breathe,” reported a user.

Our research shows that if an issue arises, like side effects, this could hinder long-term success. If Phentabz does in fact cause adverse reactions, there is a problem.

The Science – “Is There Any Proof?”

While the official Phentabz website makes the case that the supplement is an effective weight-loss pill, we can’t find any clinical studies, speaking directly to the benefits of the ingredients, other than caffeine. We did locate several cases where the Food and Drug Administration has banned DMAA from products. At DietSpotlight, finding science to back claims is critical. If there is no research, dieters should probably walk away.

The Bottom Line – Does Phentabz Work?

So, what’s our final take on Phentabz? There are some favorable aspects of the product, like the longevity of the parent company and some positive customer comments, but we can’t get past our reservations because of the lack of clinical research supporting weight-loss claims. Plus, we’re concerned about the combination of ingredients, potential for Phentabz side effects and the “F” Better Business Bureau rating.

If you’d like to see real results, we recommend going with a product that contains ingredients backed by published clinical research, with no warnings from the FDA and no side effects mentioned in any dieter review.

Among the best products we’ve seen in 2016 is one called Leptigen. The formula contains a four-ingredient proprietary blend, shown in published scientific research to help enhance fat loss and ignite metabolism. There’s no talk of negative side effects and customer reviews state people are seeing exceptional results.

Also, the makers of Leptigen are confident in the supplement, so they’re offering a Special Trial Offer, which is an excellent choice.

Learn More About Leptigen »
GD Star Rating

How Does PhenTabz Compare?

Previous PhenTabz Review (Updated February 6, 2014):

What You Should Know

Click Here To See Our Highest Rated Review

PhenTabz is a weight loss supplement that claims the only side effects from taking the supplement are increased energy and faster weight loss. The official website looks like a website for a prescription drug, which is exactly what the company is going for. According to the PhenTabz description, the supplement works like Phentermine, the prescription weight loss drug, but dieters don’t need a prescription. There are three products described on the website: PhenTabz, PhenTabz Teen and PhenTabz RX. None of these products lists ingredients used to promote weight loss.

List of Ingredients

  • None listed.

Product Description

We looked through every link on the PhenTabz website and not one ingredient is listed for any of the three formulas Gentech Pharmaceuticals wants dieters to trust. There is mention of a proprietary blend in the FAQs section of the website, but the ingredients present in that blend are not listed. Weight loss supplement companies have a responsibility to list all ingredients so dieters can review ingredients and choose whether or not they want to try a product. Moreover, some natural ingredients are contra-indicated when prescription medications are taken. Gentech Pharmaceuticals expects the dieter to just choose PhenTabz on faith that none of the ingredients cause negative side effects and that’s not a responsible choice for dieters to make. The blatant use of medical images and the extension “RX” is something we consistently tell dieters to avoid. Diet supplements are not medical supplements. Prescription medications are reviewed and approved by the Food and Drug Administration. The same cannot be said for weight loss supplements. We are also concerned that Gentech Pharmaceuticals markets a diet supplement for teens. Ingredients commonly used in diet supplements are not tested on teens and thus should not be considered healthy or safe for teen consumption. Of course, we are assuming there are ingredients other than those found in common vitamin supplements because the company does not list ingredients.

See Our Featured


  • PhenTabz can be purchased online.


  • No ingredients are listed for any of the PhenTabz products.
  • The marketing push is clearly toward dieters looking for phentermine without a prescription.
  • There is a product aimed at teens.


The first thing we look for when reviewing a diet supplement is an ingredient list. If a company is not willing to reveal the ingredients used in the formula, they are not willing to earn the trust of the consumer. We can only assume Gentech Pharmaceuticals is hiding something by not publishing the complete list of ingredients for PhenTabz, PhenTabz RX and PhenTabz Teen.

PhenTabz Questions & Answers:

We summarized hundreds of customer comments and user reviews about PhenTabz and put the information into this helpful FAQ.

What are the side effects of PhenTabz?

Possible PhenTabz side effects include chest pains, sleeplessness, jitteriness, difficulty breathing and stomach pains.

What are the ingredients in PhenTabz?

PhenTabz ingredients are 7-methyltheophylline, methyl synephrine HCL and octopamine.

Does PhenTabz work?

The actual amount of each ingredient used in PhenTabz tablets is not disclosed, which makes it impossible to know how potent this weight-loss product is. There is simply not enough clinical research or solid science presented to support the claims regarding PhenTabz.

You may want to consider substituting PhenTabz with a product backed by published scientific research such as Leptigen.

How much does PhenTabz cost?

A bottle if PhenTabz sells for $69 (60 tablets) on the official website.

What is PhenTabz’s BBB rating?

Gentech Enterprises, LCC (also Gentech Pharmaceutical) has an F BBB rating, which is the company that makes PhenTabz.

How should I take PhenTabz?

You should take Phentabz twice a day, 30 minutes prior to breakfast and lunch. It’s recommended to take this product on an empty stomach, with eight ounces of water. A single bottle of Phentabz will last for one month.

How do I contact customer service?

You can contact PhenTabz by calling 1-888-666-1714. There is also an “order status”email address, which is info@lexiumintl.com.

Can I take PhenTabz if I have a health condition?

Women who are pregnant or nursing, those under 18 years old, people with pre- existing health conditions or those taking prescription medications should consult a licensed physician prior to taking PhenTabz.

What do users like about PhenTabz?

Some customers like that PhenTabz is available on the official website and there are some video testimonials posted on the website for review.

What do users NOT like about PhenTabz?

Some users do not like that there are numerous customer complaints posted online about PhenTabz. Also, some users do not appreciate that PhenTabz can lead to unpleasant side effects and the ingredients used in this product are not explained on the website.

Have the ingredients in PhenTabz changed?

The official website is unclear about the current ingredients used in this product. However, the only ingredient mentioned is Ampheta HCL (125mg), but this substance is not explained at all.

Is there a return policy for PhenTabz?

According to the official website, you can only return this product if it’s in unopened/new condition. Also, there is a 20% restocking fee that applies.

Do you know of any special deals or discounts on PhenTabz?

No, we’re not aware of any special deals on PhenTabz at the moment. However, the last few months many of our readers have been going crazy about Leptigen’s Special Trial Offer, which is just the cost of shipping and handling. Click here to give it a shot.

16 User Reviews About PhenTabz

Leave comments below
  • 1

    This is the worst product I have ever used, I took a tablet and then my started beating really fast, I started shaking and my hands were uncontrollable, I couldn’t concrete in work as my mind was all over the place, basically felt like I had took a drug.. so it DOES have side effects! DO NOT RECOMMEND.


  • 2
    So Disappointed

    This product was the biggest waste of money! I saw the advertisement for PhenTabz in my Dr’s office so of course I thought it was credible. I was so disappointed. Can’t wait to my next Dr’s appointment to tell them that they are advertising a garbage product! There was absolutely no “dry mouth” or any other alleged “side-effects” because it’s a placebo product formulated by a company that is preying on people struggling to lose weight!


  • 3
    Patricia thomas powell

    I would like to ask if I could take this if I am on the kidney machin three times a day.


    Cameron (Editor)

    Hi, Patricia. Only your doctor would be able to say for sure though the ingredients may affect someone with conditions negatively.


  • 4

    I have PhenTabz and the ingredients is clearly stated in the bottle’s label. It say Proprietary Formulation consisting of 7-methyltheophylline, Methyl Synephrine HCL, and Octopamine.I have not started them yet. I will repost when I do.


  • 5
    arabella shah

    I can not sleep when I take it


  • 6

    yes it works! i have lost weight on it and i do like it. at first it makes me quiet and i work all day. after i get use to it, its fine. i was gettting from a doctor but office vists and such but i found it here. i havent ordered it yet from online but i do know that i have had success with it with really no side effets.


  • 7

    This product sounds great.But I just can’t try this without knowing the ingredients,that’s so risky what if there’s something in it that I’m allergic to.I just can’t be faithful on them,and I guess if they don’t want to reveal the ingredients soon I’ll have to look else where to find supplement that will help me loose weight.


    Your Name

    I posted the ingredients! Hope it helps


  • 8

    I’ve lost 17 pounds in alil over a million nth and a half. I take one pill in the morning when I wake up. I cut my cokes out and almost no sugar in my morning coffee and drink lots of water. I was 161 now 143.


  • 9
    mom of 3

    Their flyer lists these ingredients:
    “Patented Ingredients”: 7-methyltheophylline, Methyl Synephrine, & Octopamine.


  • 10

    Works great for the first month, I lost 15 pounds and had way more energy to exercise, yes you must also exercise for it to make a difference. But once accustomed to it the benefits are less. No bad side effects and I’ve been using it for a year now


  • 11
    safa saleh

    I am 17 years old this product does seem that it works but does it really keep the weight off? and would I get high blood pressure or anything like that after the weight is gone?


    Cameron (Editor)

    Safa, people under 18 years old are advised not to take these products.


  • 12

    Is the a problem taking PhenTabz with zoloft?


    Your Name

    Is aproblem taking phentabz if i use wellbutrin and klonopin for depression?


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