Are you looking for an effective and safe diet pill that can help you lose weight? If yes, then what you need is an appetite suppressing, phentermine-alternative supplement. Today’s featured product is one of the most trusted, dependable and equally effective as phentermine called PhentaSlim.

PhentaSlim is a popular pill among dieters due to its good reputation in the weight loss industry. This brand does not give any ridiculous claims or marketing gimmicks that is often seen in most dietary supplements in the market.

Learn how this product work and identify if PhentaSlim is suitable for your weight loss program in this detailed product review.

What is PhentaSlim?

PhentaSlim is a phentermine-alternative diet pill that is designed to increase your metabolic and energy levels while effectively suppressing your appetite. It is being manufactured and distributed by Optimum Nutra, Inc., a health supplement maker.

As mentioned above, this brand does not state any doubtful claims that can raise your eyebrows. Its official website is designed professionally with all contact support details in place. It provides phone number, chat feature, FAQ page and a ticket submission form, all of which are important if you want a complete assistance with PhentaSlim.

All products from Optimum Nutra undergoes a GMP manufacturing standard which ensures the quality of every product. PhentaSlim also comes from an FDA-approved facility.

This brand is designed for both men and women who want to lose weight fast in a safer way. Some of the benefits of PhentaSlim includes the following:

  • Intense fat burning action
  • Crushes appetite and shifts fat
  • Boost your metabolic and energy levels
  • Feel motivated with sharper and focused mind

PhentaSlim will turn your body into a fat burning machine for a lean, sexier and healthier body. The formula inside each capsule of PhentaSlim is safe and tested for any types of weight loss requirements. Whether you just want to lose a few pounds or significant amounts of weight, PhentaSlim can completely give you the result you deserve.

Ingredients of PhentaSlim

If you want to burn those stubborn fatty areas of your body, you need a potent fat burner that can do the task without any risks.

Unlike most diet pill brands that are not keen on revealing their “junk” proprietary blend to the public, PhentaSlim is packed with information regarding its formula which eliminates any doubts regarding its ingredient profile.

This brand offers 100% natural ingredients from known herbs, vitamins and minerals. PhentaSlim ingredients are divided into three main formula – vitamins and minerals, amino acid blend and its “Metabolism and Fat Burning Complex”.

Vitamins and Minerals

This phentermine-alternative pill contains all important B vitamins such as B1, B2, B6 and B12. It also contains zinc and niacin, which are both commonly included in most dietary supplements.

Amino Acids

PhentaSlim contains significant amounts of L-carnitine and L-tyrosine.

L-Carnitine is essential in living cells to help transport fatty acids from cytosol to the mitochondria, once the lipid fats are used for the generation of metabolic energy. In short, L-Carnitine helps burn body fat which is also the reason why this amino acid is a popular compound in most slimming products.

L-Tyrosine on the other hand can also help with weight loss but is more known to reverse the effects of stress by acting as a precursor to neurotransmitters.

Metabolism and Fat Burning Complex

PhentaSlim ingredientsPhentaSlim’s powerful fat burning properties all came from its Metabolism and Fat Burning Complex, a formula that is also offered by other diet pills. However, what makes PhentaSlim’s formula effective is because of its perfect blend of ingredients.

First, PhentaSlim contains 100mg of guarana seed sourced from the Amazonian rain forests. As you know, guarana extracts do have caffeine which provides you with instant alertness, mood, increased memory and enhanced energy. Guarana is said to also have appetite suppressing abilities. Plus, experts suggest a 75mg dose of guarana can help improve cognitive functions.

Green tea extracts, another popular weight loss compound that is known for its metabolism boosting properties. Plus, green tea extracts do have potent catechins, an antioxidants that can help protect your body from a variety of diseases.

PhentaSlim contains 50mg of Cayenne, a compound sourced from chilli pepper. In the weight loss industry, cayenne is used to help trigger thermogenesis for further fat burning processes. This is the same reason why PhentaSlim included cayenne on its formula, to help burn more fat and boost your metabolic rate.

Raspberry Ketones is also found in this diet pill. Raspberry is probably one of the widely used herb in the weight loss industry today due to its ability to increase your levels of Adiponectin hormone.

Panax Ginseng Root is another known herb that is clinically proven to give more energy because of its stimulating properties.

Lastly, PhentaSlim contains caffeine anhydrous. Caffeine is the most popular ingredient in the weight loss industry because it can either help you lose weight or it can also give you side effects. Too much amounts of caffeine can make you jittery but PhentaSlim guarantees that it offers the right amounts of caffeine for you to get good results, not too much side effects.

 Ingredient Update! 

PhentaSlim unveils its new and improved formula. See the new formulation for this powerful supplement below:

  • Green tea extract – 375mg
  • Caffeine – 270mg
  • L-Theanine – 225mg
  • L-Carnitine – 200mg
  • L-Tyrosine – 200mg
  • Panax ginseng – 120mg
  • Guarana seed – 100mg
  • Magnesium – 80mg
  • Niacin – 20mg
  • Black pepper extract – 6mg

How does PhentaSlim Work?

Like any other brands in the market, this product utilizes its powerful formula to produce results. Its Metabolism and Fat Burning Complex is a combination of highly specialized herbs that guarantees weight loss.

The stimulating caffeine content is enough to keep you mentally alert, focused and gives you a lot of energy that can lead to more fat burning process. Cayenne and its other ingredients can also trigger thermogenesis, which will enable your body to burn fat continuously even when you are at sleep.

The appetite suppressing power of PhentaSlim is proven by thousands of consumers who experienced great results. PhentaSlim can help reduce your calorie intake by curbing your appetite. Plus, PhentaSlim encourages you to increase your physical activities to get you in tip-top shape in no time.

PhentaSlim Reviews

I’ve just started using this product along with a low fat diet and exercise. I currently have 50 pounds to loose! I never have posted a review before but am very happy to say that I’m loving this pill. I have tried several different diet pills before and hated the side effects…headaches and the shakes. I have absolutely no negative side effects from this product. It curbs my hunger and gives me the little boost I need. I do have to say however the first day I took it before a meal I did vomit. I have a very weak stomach

I have been taking Phentaslim for a little over 3 months. I am ecstatic with the results. I have lost 22 lbs so far. The pills give me a good boost of energy without making me feel jittery. My appetite has also been decreased. Another major positive thing is NO CRASH! I’ve tried my fair share of diet pills (including doctor prescribed Phentermine) and one of the worst side affects is the resulting crash they can cause. I love this product and am extremely happy with the results.

I was skeptical at first about trying a diet pill as I know there are so many scammy ones out there. I found Phentaslim recommended on a site and decided to give it a try with the one month. It’s the best thing I have done as I have lots more energy and its stopped me snacking. Weight loss has been gradual and have lost a total of 8lbs! Thanks guys, I have just just ordered the 3 month package!

Gave me lots of energy to kick those gym sessions, love it. Found the weight dropping off me and not buzzed like other pills I have tried. Its made my appetite go way down. My confidence is at an all time high since taking Phentaslim, dropping 2 dress sizes has helped a lot!

***These testimonials are from third party reviews sites.

PhentaSlim CTA

Is PhentaSlim Safe to Use?

Okay, PhentaSlim has an impressive resume with an impressive formula. The question would be, is it safe to use?

Many phentermine-alternative brands online are claiming that they have the perfect weight loss formula that mimics the efficacy of real phentermine. However, there are only few products that can truly deliver results with low probabilities of side effects.

PhentaSlim is currently one of the most popular phentermine-alternative diet pills in the market (which is why it carries the name “Phen” in the first place). Thousands of people have used this brand and experienced great results without experiencing any side effects.

This brand is not completely side effect-free because it contains stimulants such as caffeine, which could lead to mild adverse health effects such as headache, jittery, dizziness and many others. So before you take PhentaSlim, make sure that you are done visiting your doctor and have his recommendation about this supplement.


Optimum Nutra recommends that you should not take PhentaSlim after 5pm to avoid any inconveniences in your sleep. PhentaSlim can give you high energy so it is not necessary to take this pill after 5pm in the afternoon.

Plus, pregnant or nursing mothers, teens under the age of 18 years, individuals who currently taking medication and those who are currently experiencing any type of health condition, should all avoid taking this diet pill. Talk to your doctor for more professional medical advise.

PhentaSlim Review Summary

PhentaSlim is another diet pill that is on our approved list. Through its decent ingredient profile and good reputation online, it passed our standards with flying colors.

PhentaSlim’s overall properties are superbly powerful and will provide you with all your slimming needs. I am rating this diet pill as “HIGHLY RECOMMENDED” due to the following reasons:


  • Effectively curbs your appetite
  • Powerful fat burning effects
  • Increases your metabolic and energy levels
  • 30-day money-back guarantee


  • May trigger side effects due to stimulants

Where to Buy PhentaSlim?

PhentaSlim is neither available at any local pharmacy store near you, nor at any online health retailing sites. This diet pill can only be purchased through its official website.

To purchase PhentaSlim, please visit its official website below.

Purchase PhentaSlim here

Perly Rodolfo

This is Perly, and I am your diet pill investigator here. I love providing useful contents online and I am committed to give you the most accurate and unbiased slimming product reviews for your weight loss needs. If you have questions, you may reach me by sending a message to our contact page.  

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  • Patrick February 26, 2015 at 2:50 pm - Reply

    Not a hype after all. I am down 8 pounds but it looked like I lost tons of weight as I feel more lighter and energetic. Definitely one of the best fat burners.

    • Perly Rodolfo February 27, 2015 at 4:10 am - Reply

      Hey Patrick! It is good to hear your experience with Phentaslim. Don’t keep us waiting on your next update. Regards.

  • Andy July 27, 2015 at 7:24 pm - Reply

    I have used this product for 2 months and lost 12lbs, really complimented my exercise routine and gave me a little pep up pre-workout too. Have no hesitation in recommended this to anyone to lose weight and get leaner.

  • Jessica October 26, 2015 at 3:56 pm - Reply

    I have to say I was very disappointed with Phentaslim. I did a lot of research before buying a diet pill, and based on my research this one seemed to claim that it worked with no side affects.
    Unfortunately I only lasted 2 days taking phentaslim because the side affects were so bad. I followed the directions, but they made me feel so jittery and almost like I was taking drugs. They made my stomach feel weird, I had terrible headaches, and even though I took the 3rd pill at 3PM, I wasn’t able to sleep until midnight or later. I thought working out might help, to burn off all of my energy, but when I exercised, it made me feel worse, and very light headed. Not ideal at all.
    I drink a lot of coffee and tea, so my body is used to caffeine. I would not recommend Phentaslim at all as the side affects were so bad, I had to stop taking them after 2 days.

    • Perly Rodolfo October 27, 2015 at 12:07 am - Reply

      Hi Jessica. Sorry to hear that. This is the first time that I received reports of side effects for Phentaslim, though this is completely not an isolated case for sure as it contains stimulants. I have revised my review. Thank you for sharing your experience with Phentaslim.

  • Margarita January 28, 2016 at 2:33 am - Reply

    Good energy booster. Truly an awesome product! Love it!

    • Perly Rodolfo January 28, 2016 at 2:49 am - Reply

      Thank you Margarita.

  • A April 1, 2016 at 8:57 am - Reply

    What kind of gelatine does it contain in the capsule

  • alla June 14, 2016 at 1:37 pm - Reply

    Do not buy Phentaslim from Optimum Nutra! Another deception!. the company are CROOKS! They promise the full refund and lie to you. They keep 10 pounds for HANDLING? which has never been specified when you buy it from them. And also unlike other companies which send you a pre-paid envelope they demand a registered letter at your own expense. So i lost 20 pounds on this useless stuff.- Alla

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