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Phentaslim, advanced slimming formula

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Does slimming with confidence appeal to you? Of course, because who wouldn’t want to find THE safe, effective slimming pills to help you regain your figure? Slimness and confidence are the 2 key words used by PHENTASLIM to promote its slimming product.

So, can we trust Phentaslim?

Phentaslim presentation and promises

Phentaslim is a slimming pill with 14 clinically proven ingredients (according to the manufacturer), including several essential vitamins and minerals, providing a perfectly balanced micro-nutrient slimming supplement.
Formulated with 100% natural ingredients (again according to the manufacturer), Phentaslim is said to :

  • Reduce excess body fat;
  • Reduce cravings ;
  • Increase energy;
  • Accelerate metabolism;
  • Improve cognitive performance.

Phentaslim is said to have no side effects, making weight loss quick and easy.

The recommended dose is 1 capsule of Phentaslim 20 minutes before breakfast, with a large glass of water, followed by another capsule 20 minutes before lunch, again with water.

Phentaslim, the manufacturer


Phentaslim is manufactured by Optimum Nutra, a Cyprus-based company founded in 2011.
If the company’s official website is to be believed, the manufacturing laboratories are GMP (Good Manufacturing Practice) and TGA (Licence Therapeutic Goods Administration) certified, and undergo regular checks to ensure compliance with European and international manufacturing standards.

Despite this apparently serious showcase, we noticed that no information exists about this company outside the website, which is very sparse indeed. The company’s Cypriot location is a second reason for caution, as this is an area where the laws, particularly with regard to taxation and corporate identity, do not meet European criteria. Many unscrupulous manufacturers of slimming products base their headquarters in Cyprus, and take advantage of this to rip off consumers. We also discovered an address in Panama.

In conclusion, while there is nothing to indicate that Optimum Nutra is a fraudulent company, we prefer to urge our readers to be vigilant.

Phentaslim ingredients

Phentaslim is made up of the following ingredients (dosages given correspond to the contents of two capsules):

1. Thiamine (Vitamin B1) (1.3mg):

Plays an essential role in sugar metabolism.

2. RiboflavinI (Vitamin B2)(1,7mg):

Plays an important role in lipid, carbohydrate and protein metabolism.

3. Vitamin B6 (Pyridoxine HCL)(1.8mg):

Promotes metabolic activation and reinforces the action of Phentaslim’s various components.

4. Vitamin B12 (Cyanocobalamin)(10mcg):

Prevents cardiovascular disease and has a positive effect on fatty acid metabolism.

5. Zinc (Zinc acetate)(15mg):

Regulates blood sugar levels and stimulates the production of leptin, which increases satiety and reduces appetite.

6. Niacin (nicotinic acid)(20mg):

Another name for vitamin B3, it enables the body to optimally use ingested calories to produce the energy it needs, and thus supports weight loss.

7. Guarana (seeds)(100mg):

This plant is a natural appetite suppressant and fat burner.
To find out more about guarana, read our full article HERE.

8. Caffeine (anhydrous)(150mg):

Caffeine is also recognized for its ability to enhance the effects of weight-loss diets, thanks to its fat-burning and metabolism-boosting properties.

9. Green tea (4:1 extract)(125mg):

A well-known fat-burning ingredient, green tea contains theanine (equivalent to caffeine) and catechins, which give it its ability to activate lipolysis and thermogenesis.
Green tea increases the body’s production of noradrenalin, which in turn increases energy expenditure and the oxidation of fat reserves.

10. Cayenne (50mg):

Capsaicin, the active ingredient in cayenne pepper, stimulates the secretion of the hormones adrenalin and noradrenalin. These hormones play an important role in burning stored sugars and fats.
Adrenalin is also known to have an appetite-suppressant effect.
In addition, capsaicin increases metabolism and thermogenesis, and therefore energy expenditure.

11. Raspberry ketone (200mg):

A very popular ingredient in slimming pills these days, to which we have devoted an entire article which you can consult by HERE.

12. L-Tyrosine (200mg):

An amino acid that helps reduce appetite, but also stress, one of the many factors in weight gain.

13. L-Carnitine (250mg):

L-carnitine plays a role in the transport of fats, which are then used by the body to provide energy.
It also regulates blood glucose levels.
Finally, L-carnitine increases calorie burning and combats fatigue.

14. Ginseng (root)(75mg):

This root raises energy levels, improves mental functions and endurance, and helps the body adapt to physical effort.
Ginseng is also of interest as it activates digestion and promotes the elimination of toxins.

Phentaslim also contains the following non-active ingredients: gelatin, calcium carbonate and magnesium stearate.

We particularly appreciate the manufacturer’s transparency regarding the dosages of each ingredient in Phentaslim’s composition. This is a very important point for us, as it is this criterion which determines the effectiveness of a product.

Phentaslim and science

No studies have been carried out on Phentaslim specifically.
However, according to the official website, the various ingredients in these slimming pills have been the subject of various clinical studies.
Let’s take a look at some of the research carried out on Phentaslim’s main ingredients.

For many years, green tea has been recognized for its fat-burning and thermogenic properties.
There is no shortage of studies on the subject. We have chosen this referenced study, which evaluates the effects of long-term ingestion of catechin-rich tea on energy expenditure and dietary fat oxidation in healthy subjects.
(Sources: Journal of Health Science. The Pharmaceutical Society of Japan. Vol. 51 (2005) N°: 2 P 248-252. doi : 10.1248/jhs.51.248 – NCBI. PubMed. Unilever R&D, Shanghai, China. Wang H., Wen Y., Du Y., Yan X., Guo H., Rycroft JA., Boon N., Kovacs EM., Mela DJ. Obesity (Silver Spring). 2010 Apr;18(4):7739. doi : 10.1038/oby.2009.256. Epub 2009 Aug 13).

Caffeine is also officially recognized for its ability to increase thermogenesis and fat oxidation, as well as for its appetite-suppressant effects.
We mention this study that addresses body weight loss and weight maintenance in relation to habitual consumption of coffee and green tea supplements.
(Source: NCBI. Department of Human Biology, Maastricht University, The Netherlands. Westerterp-Plantenga MS, Lejeune MP, Kovacs EM. Obes Res. 2005 Jul;13(7):1195-204).

L-Carnitine has also been the subject of clinical studies showing its benefits not only for weight loss, but also for reducing fatigue linked to physical effort.
Here, in this context, is a study which closely examined the effects of oral L-Carnitine supplementation on the oxidation of long-chain fatty acids in vivo in healthy adults.
(Source: NCBI. PubMed. University of Leipzig, Children’s Hospital, Germany. Müller DM., Seim H., Kiess W., Löster H., Richter T. Metabolism. 2002 Nov; 51(11):1389-91).

Side effects and contraindications of Phentaslim

Phentaslim contains a substantial dose of caffeine. It is therefore important to follow the manufacturer’s recommendations, and not to take Phentaslim after 6 p.m.
At too high a dose, or in sensitive individuals, caffeine can cause nausea, insomnia, irritation, changes in heart rate and so on.
At the slightest sign of undesirable effects, it’s advisable to reduce doses, or even stop your course of treatment, to avoid any risk to your health.

Cayenne and pepper can also cause heartburn.
To avoid this, it’s important to take Phentaslim pills with food.
It’s a pity that the manufacturer recommends taking them 20 minutes before meals.
You can test your sensitivity and see whether taking them before meals is right for you.

This slimming product is not recommended for pregnant or breast-feeding women.
If you are undergoing medical treatment, we advise you to consult your doctor before taking Phentaslim.

User testimonials on Phentaslim

There are very few independent testimonials on Phentaslim. The few we have been able to gather are not satisfied with this slimming product.

If you’ve tried Phentaslim, share your experience in the comments section to help other readers!

Phentaslim price and guarantee

Phentaslim is available in several formats, depending on the number of kilos to be lost.

  • Loss of 1 to 5kg – 1 bottle of Phentaslim – 49,95€ + 9,95€ delivery charge
  • Loss from 5 to 9kg – 2 bottles of Phentaslim – €49.95 + €9.95 delivery charge 79,95€ + free delivery
  • Loss of 9kg and over – 3 bottles + 1 free delivery 129,95€ + free delivery

The site advertises a 60-day money-back guarantee.
Please note, however, that the terms and conditions of sale stipulate that customer service must be contacted within 30 days of the order date for return instructions, and that the guarantee applies to only 1 opened bottle.
All others must be returned unopened before they can be resold.
In addition, it is also stipulated that in order to return products, you must be able to testify to your slimming diet program and physical activity.

Our opinion on Phentaslim

At this point, we’re faced with a dilemma.
On the one hand, Phentaslim contains ingredients recognized and validated by science, its composition is interesting and the dosages of components are expressed with complete transparency.
On the other hand, there is a lack of information about the company: the address displayed is sometimes in Cyprus and sometimes in Panama, and the link to customer service, at the time of writing, is unavailable.

Faced with this situation, and to be on the safe side, we have decided to reject this product due to the lack of information on the manufacturer.

Leave a Comment


  • pullara salvatrice

    Hello, I placed an order for phentaslim 3 bottles + 1. I’ve been using it daily for 3 weeks and I haven’t lost 1 gram, I’d even say I’ve gained 800gr. I would like my money back.

    • Hélène. M

      I’m sorry, but did you read our test? We’re actually saying that we’re opting to reject this product because of the lack of information about the manufacturer.

      Also, does not sell products or represent any manufacturer.. We are an information site only. I therefore invite you to return to the page from which you made your purchase and gather the necessary information to contact the seller.


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