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PhenTabz Review - 11 Things You Need to Know

PhenTabz by Lexium International is a multi-functional weight management product that claims to offer several benefits associated with weight loss. The product claims to perform two essential functions: to increase the body’s mobility of fat while promoting an increased metabolic rate and curbing appetite. This sounds good, and the PhenTabz website includes some positive customer testimonials – however, these reviewers are compensated by Lexium, which is always a red-flag for us.

We asked our science team to take a closer look at the ingredients of PhenTabz and provide details on whether or not this combination of ingredients can offer the benefits claimed by Lexium. We will also give you the Bottom Line on PhenTabz, based on a supplement’s scientific review.

PhenTabz can be purchased through their Official Site.

PhenTabz Readers: Noom is offering our readers a risk-free trial, for a limited time. Click here for more information!

What is PhenTabz?

PhenTabz is a weight-loss supplement that claims to accelerate metabolism and drive out the excess fat from your body. It says it helps those who want to reduce weight, but exercise does not help them much.

According to the company, the supplement helps to suppress your appetite with their wide variety of ingredients so you can control your hunger pangs and lose weight effectively – but what does the research say?

  • Drug and Chemical ToxicologyAccording to this overview, “No human studies have examined the effects of p-octopamine on athletic performance or weight loss and weight management. A need exists for both animal and human safety and efficacy studies involving oral administration of p-octopamine.”
  • Journal of Physiology and BiochemistryThis study found that octopamine may reduce body weight gain in rats.
  • Experimental Biology and MedicineSynephrine was found to reduce fat cells in the body at high doses, though this may lead to negative side effects.

Forevergreen Prodigy 5 and weight loss

The PhenTabz diet pills should be taken only if your health practitioner approves. They are available online and do not require any prescription.

PhenTabz diet pills can be taken with diet and regular exercise to reach your weight loss goals. PhenTabz diet pills may help burn fat and increase the metabolism so that you can lose weight, but you need to put in a lot of hard work.

PhenTabz diet pills may also give you more energy to exercise so you can burn away the unwanted fat. The recommended dose is one capsule per day. Since they are just capsules, they are easy to use, unlike other supplements that require preparation before you can ingest them. You can get samples of the tablets on their online website.

PhenTabz Competitors


How Did PhenTabz Start?

PhenTabz is the creation of Derek Vest. The founder and CEO sold the supplement through his company, GenTech Pharmaceutical. However, Vest pleaded guilty in 2017 for adding illegal ingredients, DMAA, to his supplements.

PhenTabz is currently sold through Lexium International. The supplement maker claims to be “one of the largest non-prescription pharmaceutical companies.”


PhenTabz Ingredients

PhenTabz ingredients include:

  • Caffeine
  • Synephrine HCL
  • Octopamine HCL


Synephrine is also known as bitter orange. According to the British Journal of Clinical Pharmacology, synephrine produced “an increased fat oxidation rate while it reduced carbohydrate oxidation rate when exercising at low-to-moderate intensities.”


Octopamine is a chemical thought to have minor fat burning effects, states Examine.com. However, there’s no research supporting this claim.


Caffeine is a stimulant supposedly helping to boost weight loss, suppress appetite, and help burn calories.

How Does PhenTabz Work?

There’s only anecdotal evidence supporting the effectiveness of PhenTabz. However, there’s research showing some PhenTabz ingredients may promote weight loss to some degree.

PhenTabz Price

PhenTabz is only available for purchase on their official website. On there, you can buy a single bottle for $69.

Other purchase options on the website allow you to buy two, three, and four bottles at once, which cost $131, $187, and $249. The idea is that you receive discounts, the more bottles you buy.

Benefits & Claims

PhenTabz Benefits and Claims

PhenTabz claims include:

  • Appetite suppression
  • Stimulate metabolic rate
  • Accelerate fat metabolism
  • Promote weight loss
  • Lose body fat, not just water weight

Does PhenTabz Work?

Though there is no scientific research supporting the claims, PhenTabz works. While some of the ingredients are effective for weight loss, there’s no connection between PhenTabz and weight loss.

Side Effects

PhenTabz Side Effects

While there’s no mention of side effects from PhenTabz, there’s the chance some may notice side effects from PhenTabz ingredients, including:

  • Nausea
  • Upset stomach
  • Headaches

Specific side effects associated with DMAA is worthy of a separate mention. According to the Food and Drug Administration (FDA), “Taking DMAA can raise blood pressure and lead to cardiovascular problems ranging from shortness of breath and tightening in the chest to heart attack.”

Product Warnings

What are the Precautions for PhenTabz?

There are warnings connected to PhenTabz, including:

  • Keep out of the reach of children
  • PhenTabz isn’t intended for those under 18 years of age
  • Do not use PhenTabz if you’re pregnant or nursing
  • Do not use PhenTabz if you’re taking prescription or OTC medications/supplements

As a reminder, speak with your doctor before using any dietary supplement.

PhenTabz Lawsuits

Derek Vest, former president of Gentech Pharmaceutical, was sentenced to 18 months in federal prison and fined $2.5 million. This comes after pleading guilty for his role in misleading consumers through the mislabeling of popular supplements sold by his company.

Gentech sells dietary supplements under the name AddTabz, which claims to be a safe alternative to Adderall and can also be used to achieve instant focus, heightened memory, and improved brain function. They also marketed the weight-loss supplements, PhenTabz and its teen counterpart, PhenTabz-Teen. All of the aforementioned products contained DMAA (dimethylamylamine), which the FDA does not recognize as an acceptable dietary supplement.

DMAA can act as a stimulant, but when added to other ingredients, it has the ability to raise blood pressure to dangerous levels that can result in breathing problems and even heart attacks. The FDA had issued warning letters to companies using DMAA to remove them from their products as early as 2012.

Mr. Vest is accused of allowing the ingredient to be included in the supplements while purposefully neglecting to disclose its inclusion on the label. The production and sale of supplements containing DMAA by Gentech happened between April 2013 and November 2014, with over 2 million products being sold to consumers under these conditions.

What Users Are Saying

“I’ve been taking these for a while and have had no bad side effects. These help keep my appetite under control and help me to lose weight. As always I’d suggest talking to your dr if you plan to take these especially if you have underlying health problems… these are not for everyone.”

“I tried these and it did work. I lost 16 pounds in a month but I think they are a little dangerous. It made me feel full all the time and when I did eat something small I couldn’t hold it down, so I pretty much starved for a month. I also couldn’t sleep at night, it gave me stomach cramps and made me light headed.”

“Work to decrease appetite and increase energy. However, is expensive.”

Bottom Line

The Bottom Line on PhenTabz Rx

There are some favorable aspects of PhenTabz Rx, as the parent company’s longevity and some positive customer comments. Still, 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, the 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 backed by published clinical research that shows it not only helps you lose weight but also keeps it off.

Among the best products we’ve seen this year is the weight-loss app called Noom. The program is a stellar example of what technology can do to help you lose weight. There are lots of apps. But none other includes human coaching and experts, including doctors, who share articles and advice on losing weight best.

The company is also so confident that you’ll love Noom that they’re offering a free trial offer for a limited time.

Learn More About Noom »
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What are the side effects of PhenTabz?

PhenTabz possible 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 RX 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.

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.

Where can I buy PhenTabz?

PhenTabz can be purchased using their Official Site.

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.

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.

19 PhenTabz Reviews

  • Is it safe with Zoloft?

    Is the a problem taking PhenTabz with zoloft?

    • Victoria (Editor)

      Hi Marsha! Because of possible interactions with your anti-anxiety medications, please make sure to consult with your physician before taking this product to make sure you can safely combine the two.

  • Your Nameamanda Runyon

    I’ve been taking them almost two weeks and I can’t tell any difference in my weight but yes they do give you energy

    • Victoria (Editor)

      Hello. We’re sorry that you weren’t able to achieve your weight-loss goals with Phentabz; you might have reached a weight-loss plateau. Have you looked into metabolism boosters? You might want to check out Dietspotlight Burn.

  • Lost 30 pounds in 1.5 months

    I’ve lost about 30 pounds of weight in approx 1.5 months. I have also visibly dropped my waist size and have not felt jittery. With no exercise, just watching what I eat. However I seem to be having many loose bm’s while taking them (which is the reason I first started looking into their side effects).

  • Tarra

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

  • stacey

    Every time I take this pill I get sleepy. Never gave me energy

    • hiway1962@gmail.com

      Yep, I feel the same way! It does not give me energy, it makes me unmotivated, and i am not taking any other drugs…

  • Don't recommend it.
    Monica (Verified Purchase)

    I actually did have shortness of breath and chest pain with these pills when I take a whole one. I would not recommend these to anyone but healthy people with no past medical history or on any other medications. Honestly probably shouldn’t take them period.

    • Diana

      Monica, if you don’t mind, how old are you? I’m no spring chicken…

  • Alexandra

    I’ve been using it for the last 3 months and it seemed to work amazing at first, I lost 9 lbs in about two months and felt great, however, the last couple weeks it’s not doing much. Guess i’ll stop taking them

    • Tabitha mccollum

      I paid 77$

    • Victoria (Editor)

      Hi Alexandra, you might have reached a plateau. You may want to spark up your weight-loss by leaning towards more of a metabolism booster supplement. Have you read up on Dietspotlight Burn? You should check it out.

  • This is the worst product
    MMW (Verified Purchase)

    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.

  • arabella shah

    I can not sleep when I take it. Doctor said it was because of the caffeine. wont be taking this anymore

    • Debra

      I haven’t taken it yet. I read you shouldn’t take it if you have high blood pressure and I have that so I have been scared to start it. I did read, Arabella, that if you are having trouble sleeping while taking this, to drink 3 or 4 more glasses of water a day.

  • cheri

    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.

  • I take one pill in the morning
    Crystal (Verified Purchase)

    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.

  • No bad side effects
    Brian (Verified Purchase)

    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