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Introduction

More and more of us are becoming obese, and our consumption of weight management products like diet pills, weight loss shakes and appetite suppressants is at an all time high.

If you’ve been hunting for a fat burner pill, there’s a good chance you may have laid eyes upon a product named Phentaslim. It’s arguably one of the most popular weight loss supplements on the market and promises a lot of bold things, but can it really deliver on them?

In this Phentaslim review we’re taking a look at what it has to offer consumers, what goes into the formula, whether or not it’s safe, and ultimately, whether or not it’s worth your hard-earned money.

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Readers please note that statements on this page are fair comment based on observation. This content is produced on a matter of public interest. Statements on this page are our honest opinion.

What Is Phentaslim?

Phentaslim is a self-proclaimed “metabolic diet formula” (i.e. a weight loss pill) produced by a US-company named Optimum Nutra Inc.

One bottle of Phentaslim contains 90 capsules, costs $52.99 and will last users for approximately 30 days based on the directions of three capsules per day; it is only available from the official Phentaslim website.

As you’ve probably already guessed, the product is targeted towards those who are looking for an extra boost towards achieving their weight loss goals.

The Phentaslim formula is a complex of various natural herbal extracts, stimulants, amino acids and vitamins; Optimum Nutra Inc directly describe this product as a powerful weight loss formula that works to “destroy hunger pangs and annihilate body fat”.

Consumers of Phentaslim are promised effects such as boosted energy levels, an elevated metabolism, the increased ability to burn body fat and suppressed appetite levels.

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Does Phentaslim Work?

Based on our research used in the Phentaslim formula, we firmly believe that this is a fat burner that will deliver weight loss results for users, provided that it is used in the correct way.

Firstly, it should be stressed that if you use Phentaslim and continue to consume more calories than you body requires, you’ll continue to gain weight – not Phentaslim or any other fat burner pill will be able to combat a bad diet and inactive lifestyle.

When it comes to the formula, Phentaslim contains a complex of clinically proven ingredients that will help to boost your metabolic rates, which can help your body increase the rate that it burns calories.

Furthermore, the product contains ingredients that are very useful for appetite control – we expect that the average Phentaslim user will experience appetite suppressant effects, which will help to lower your daily caloric intake.

Another benefit to Phentaslim is that it can help reduce your perceived rate of exertion (RPE). If you’re an avid gym-goer, taking the product prior to your workouts is likely to significantly improve your performance.

The Pros & Cons Of Phentaslim

Below we’ve listed everything that we believe is either a positive or negative:

The Pros

  • May suppress user appetite levels.
  • Boosts energy levels and elevates metabolism.
  • Comes with a 60 day money-back guarantee.
  • Formula contains B-vitamins.

The Cons

  • Weight loss isn’t guaranteed – you’ll still need to ensure you’re not overeating and leading an inactive lifestyle.
  • Potentially unsuitable for those sensitive to caffeine.

Editor’s note: Shopping around? Click here to check out our most recommended fat burning formula.

What Are The Phentaslim Ingredients?

We have found the following Phentaslim nutritional information from the official website:

Three Capsules Contains: Panax Ginseng 1200mg, Guarana Seed 400mg, Green Tea 200mg, Caffeine Anhydrous 270mg, L-theanine 225mg, Acetyl L-Carnitine 200mg,  L-Tyrosine 200mg, Ginkgo Biloba Leaf Powder 120mg, Magnesium 80mg, Cayenne Powder, Black Pepper Extract 24mg, Niacin 20mg, Zinc 15mg, Vitamin B6 1.8mg, Vitamin B2 1.3mg, Vitamin B1 1.3mg & Vitamin B12 10mcg.

Is Phentaslim Suitable For Everyone?

Phentaslim should not be used by women who are pregnant or breastfeeding, nor should it be taken by anyone under the age of 18.

Ingredients inside Phentaslim may worsen symptoms of anxiety or bipolar disorders. Additionally, ingredients inside the formula may interfere with blood sugar levels.

Is Phentaslim Safe?

Based on the formula, we are confident in saying that Phentaslim is completely safe provided that it is used correctly (i.e. the daily serving size amounts are not exceeded); Phentaslim contains no banned or dangerous ingredients, and isn’t excessively dosed in stimulants.

What Are The Phentaslim Side Effects?

We have compiled the following list of potential side effects Phentaslim may produced, based on the ingredients and amounts inside the formula:

  • Insomnia
  • Restlessness
  • Diarrhea
  • Acid reflux
  • Anxiety
  • Jitters
  • Insomnia [1]

Note: these side effects are possible but may not be the typical user experience.

Are There Any Phentaslim Reviews From Customers?

We have found the following Phentaslim review testimonials from the DietPillsWatchDog website:

I ordered this product mid-April and am really liking it so far! Have lost noticeable weight (that people comment on). I do exercise regularly anyway so haven’t changed anything there, it’s just given me a much needed boost. The only thing I will say is that – as a big caffeine drinker myself – do not drink coffee while taking this product, at first I couldn’t sleep/was feeling a bit jittery. However when I cut the coffee down that all stopped! Good product if taken correctly!

I received my order in the mail super fast which was awesome. Best of luck to everyone who takes these, they’re great!

Our Final Verdict On Phentaslim

To conclude our Phentaslim review, we believe that product certainly has more positives than negatives, and if used correctly could certainly be beneficial for someone who’s trying to shift some stubborn belly fat.

Firstly, we like how it will very likely help lower your appetite levels (at least for a short term period) – an effect that will likely be triggered by the caffeine-content of the product.

Another useful trait is the metabolism-boosting effects; with a faster-running metabolism you’ll naturally feel more energized and will increase the rate your body burns calories.

Finally, we like how it’s got a 60-day money back guarantee.

Remember, Phentaslim isn’t a “quick-fix” product – you must fix your diet and ensure you’re regularly exercising for it to properly work.

Kath Ross, PhD
Kath Ross, PhD
Health Editor & Fact Checker at DietProbe
Kathryn is a Ph.D Health Editor here at DietProbe. She specializes in diabetes and weight control research and in her spare time she's a professional cat lady and wine connoisseur!
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Fact Checked


This article has been reviewed and fact-checked by a certified nutritionist, and only uses information from credible academic sources.