Phentaslim, Review, Customer Opinion and Analysis… We tell you everything!

Evaluation : 2.5/5. (2 reviews)

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phentaslimSlimming with confidence, does that tempt you? Of course, because who doesn’t want to find THE effective and safe slimming pills to regain a beautiful figure? Slimming and confidence, these are the 2 key words used by PHENTASLIM to promote its slimming product.

So, can we trust Phentaslim?

Presentation and promises of Phentaslim

Phentaslim is a slimming pill made up of 14 clinically proven ingredients (according to the manufacturer), including several essential vitamins and minerals, resulting in a perfectly balanced micronutrient slimming supplement.
Formulated with 100% natural ingredients (always according to the manufacturer), Phentaslim would:

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

Phentaslim would be without side effects, and would allow simple and rapid weight loss.

The recommended dose is 1 capsule of Phentaslim 20 minutes before breakfast, accompanied by a large glass of water, then another capsule 20 minutes before lunch, always taken with water.

Phentaslim, the manufacturer

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

Despite this apparently serious showcase, we have noticed that no information exists on this company apart from the website, which is also very sparse. The Cypriot location of the company is a second element that invites us to be cautious, because it is an area where the laws, particularly with regard to taxation and corporate identity, do not meet French criteria. and Europeans. Many unscrupulous manufacturers of slimming products base their headquarters in Cyprus, and take advantage of this to scam consumers. We also discovered an address in Panama.
In conclusion, even if nothing indicates that Optimum Nutra is a fraudulent company, we prefer to invite our readers to be vigilant.

Phentaslim Ingredients

Phentaslim is composed of the following ingredients (the dosages mentioned correspond to the contents of two capsules):
1. Thiamine (Vitamin B1)(1.3mg):
It plays an essential role in the metabolism of sugars.
2. Riboflavin I (Vitamin B2)(1.7mg):
It plays an important role in the metabolism of lipids, carbohydrates and proteins.
3. Vitamin B6 (Pyridoxine HCL)(1.8mg):
Promotes the activation of the metabolism and reinforces the action of the various components of Phentaslim.
4. Vitamin B12 (Cyanocobalamin)(10mcg):
It prevents cardiovascular diseases, and acts positively on the metabolism of fatty acids.
5. Zinc (Zinc Acetate)(15mg):
It regulates blood sugar, and stimulates the production of leptin, which increases the feeling of satiety and reduces appetite.
6. Niacin (nicotinic acid)(20mg):
Another name for vitamin B3, it allows the body to make optimal use of the calories ingested to produce the energy it needs, and thus supports weight loss.
7. Guarana (seeds)(100mg):
This plant has natural appetite suppressant and fat burning effects.
To learn more about guarana, see 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-stimulating properties.
9. Green Tea (4:1 Extract)(125mg):
A known and recognized 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 production of norepinephrine in the body, which consequently increases energy expenditure and the oxidation of fat stores.
10. Cayenne (50mg):
Capsaicin, the active substance present in cayenne pepper, stimulates the secretion of adrenaline and noradrenaline hormones. These hormones play an important role in burning stored sugars and fats.
Adrenaline is also known to have an appetite suppressant effect.
In addition, capsaicin increases metabolism and thermogenesis, and therefore energy expenditure.
11. Raspberry Ketone (200mg):
Ingredient very popular these days in slimming pills and to which we have devoted an entire article that you can consult HERE.
12. L-Tyrosine (200mg):
An amino acid that reduces appetite, but also stress, one of the many factors of 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 plays a role in regulating the level of glucose in the blood.
Finally, L-carnitine increases the calorie burning phenomenon and fights fatigue.
14. Ginseng (root)(75mg):
This root elevates energy, improves mental function and endurance, and helps the body adapt to physical exertion.
Ginseng is also interesting because it activates digestion and promotes the elimination of toxins.

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

We particularly appreciate the transparency of the manufacturer regarding the dosages of each ingredient that goes into the composition of Phentaslim. This is a very important point in our eyes, since it is this criterion that determines the effectiveness of a product.

Phentaslim and science

There is no study done on Phentaslim specifically.
On the other hand, and this is what the official site says, the different ingredients used in the composition of these slimming pills have been the subject of different clinical studies.
We review some of the research done on the main ingredients in Phentaslim.

Green tea has been an ingredient recognized for several years for its fat-burning and thermogenic properties.
Studies about it abound. We chose 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.
(Source: Journal of Health Science. The Pharmaceutical Society of Japan. Flight. 51 (2005) No: 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 (SilverSpring). 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, fat oxidation, as well as for its appetite suppressant effects.
We mention this study which deals with 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).

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L-Carnitine has also been the subject of clinical studies which show its interest in losing weight, but also in reducing fatigue linked to physical effort.
In this context, here is a study that 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).

Phentaslim Side Effects and Contraindications

Phentaslim contains a substantial dose of caffeine. It is therefore important to follow the manufacturer’s recommendations carefully, and not to take Phentaslim after 6 p.m.
At too high a dose, or in sensitive people, caffeine can cause nausea, insomnia, irritation, changes in heart rate, etc.
At the slightest sign of adverse effects, the doses should be reduced, or even stopped, to avoid any risk to your health.

Cayenne pepper and pepper can also cause heartburn.
To avoid this phenomenon, it is important to take Phentaslim pills with food.
Too bad the manufacturer recommends taking them 20 minutes before meals.
You can test your sensitivity and see if taking it before meals is right for you.

This slimming product is not recommended for pregnant or breastfeeding women.
If you follow a medical treatment, we advise you to consult your doctor before starting a course of Phentaslim.

Phentaslim User Testimonials

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

If you have tested Phentaslim, share your experience in the comments section to help other readers!

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Phentaslim Price and Guarantee

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

  • Loss of 1 to 5kg – 1 vial of Phentaslim – 49.95€ + 9.95€ shipping costs
  • Loss of 5 to 9kg – 2 vials of Phentaslim – 79.95€ + free delivery
  • Loss of 9kg and more – 3 bottles + 1 free – 129.95€ + free delivery

The site advertises a 60-day money-back guarantee.
Be careful though, because the general conditions of sale stipulate that you must contact customer service within 30 days from the date of order to obtain return instructions, and that the guarantee applies to only 1 open bottle.
Others must be returned still sealed for resale.
In addition, it is also stipulated that to return the products, it is necessary to be able to testify to your slimming food program and your practice of a physical activity.

Our opinion on Phentaslim

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

Faced with this situation and for more security, we opt for the rejection of this product because of the lack of information on the manufacturer.

Alternative to Phentaslim

If you want to consult another test about an effective and serious slimming solution, I advise you to review the article below:


“PhenQ” is a slimming tablet that combines the positive slimming effects of several dietary supplements to achieve optimal weight loss!

See the analysis and testimonials on PhenQ!

Last update: September 14, 2022.