Phentaslim review

Phentaslim Review: The Ultimate Fat Shredder

Written By : Dr Ruby Shah   ✓ Fact Checked

Overcome untimely hunger with the organic goodness of Phentaslim, a fat annihilating capsule made with herbs. Go through this review for more information.

(Last Updated on November 20, 2023)

Is your belly protruding? Are your love handles more pronounced?

Worse still, your diet has been giving you a frustrating outcome, and your body is not responding to exercise.

You are not imagining it; sometimes, the body fails to respond to dieting and exercising due to behavioural and biological factors.

The journey to weight loss is difficult and complicated, but, you can stimulate the process by taking a fat burner such as Phentaslim.

Phentaslim makes weight loss easier and quicker when combined with healthy lifestyle changes.

It claims to:

  • Target stored fat.
  • Increase energy levels.
  • Fire up metabolism.
  • Improves mood.
  • Suppress appetite.

But, does it live up these claims? Let’s find out.

What Is Phentaslim?

Phentaslim is a fat burning supplement that promises to torch stored fat, increase metabolic rate and boost energy levels.

It promises to work well when combined with lifestyle changes, including reducing low nutrient foods and engaging in some form of exercise.

It is manufactured by OptimumNutra, a supplement company, founded in 2011, to provide products that promote health and well being.

You can expect the following benefits:

  • Improved health.
  • Increased fat loss.
  • Boosted mental clarity.
  • Reduce hunger pangs.
  • More energy.

Phentaslim Ingredients


Here is an in-depth analysis of Phentaslim ingredients.

Metabolism and Energy

Green tea (4:1)(375mg)
Green tea contains caffeine, a popular stimulant that supports weight loss and enhances performance. Besides, it contains potent antioxidants known as catechins-EGCG (epigallocatechin gallate ) particularly, increases metabolism. What’s more? Green tea facilitates fat burn by enhancing the effects of fat-burning hormones such as norepinephrine. Norepinephrine signals fat cells to breakdown fat. EGCG blocks the enzyme that breaks down norepinephrine, thus increasing its amount. More norepinephrine increases fat breakdown.
Caffeine anhydrous (270mg)
Have you encountered an energy drop in the gym? Caffeine is a stimulant that will increase your energy levels, supporting performance. It enhances concentration and alertness and improves muscle endurance. Besides, caffeine boosts your metabolic rate; as the body burns more calories, it releases more energy. A study 1 showed that caffeine could increase resting metabolic rate by about 3 to 11 per cent depending on the dosage. This means that it increases the number of calories you burn at rest.
Acetyl L-Carnitine(200mg)
The body converts acetyl L-Carnitine into L-Carnitine and vice versa. L-Carnitine is an amino acid that helps the body to produce energy. Acetyl L-Carnitine has been seen to reduce memory problems and fatigue in older people. It facilitates the transportation of fatty acids to the mitochondria where they are burned for energy. Also, it improves mitochondrial function. So how does it aid in weight loss, we hear you ask. Since acetyl L-Carnitine facilitates the movement of more fatty acids to the mitochondria, this means that it will increase your body’s ability to burn fat. But, there are conflicting studies on its role in fat and weight loss. A 2016 review 2 of 9 studies showed that L-Carnitine supplementation resulted in considerable weight loss. But, in another study 3 involving obese women who combined L-Carnitine and aerobic exercises, there were no changes in total body mass and fat mass. Also, some women experienced diarrhea or nausea. Thus, more research is needed to back this claim.
Guarana seed (4:1) (400mg)
Guarana is a stimulant rich in antioxidants including catechins, caffeine, tannins, theobromine and saponins that help fight radical damage. Caffeine improves focus and reduces fatigue. It inhibits the effects of adenosine – the compound responsible for brain relaxation- by binding to adenosine receptors. Also, caffeine increases metabolic rate, thus, boosting fat burn. Studies 4 show that guarana may inhibit genes that support fat cell production and increase genes that slow fat production.
Cayenne pepper (50mg)
Cayenne pepper supports weight loss by speeding up your metabolism, suppressing your appetite and stimulating more calorie burn. It contains capsaicin –its active ingredient – believed to speed up metabolism and lower your appetite. A 2009 study 5showed that capsaicin reduces the release of ghrelin- the hunger hormone. Also, it was seen to make people fuller; hence you are likely to eat less food.
L-Theanine (225mg)
L-Theanine is an amino acid present in tea leaves. It is known for its calming effect and its ability to enhance focus. But, L-Theanine is very crucial in weight loss. L-Theanine contains appetite suppressing effects. This means it will help you reduce your cravings and attain a calorie deficit. Sleep deprivation is a trigger to fat gain. Research shows that poor sleep is associated with increased hunger pangs. This is because there is an increase in the production of ghrelin- a hormone that enhances hunger and appetite. L-Theanine improves sleep and feelings of relaxation. Thus, good sleep hygiene equals faster weight loss. Studies 6 show that when combined to caffeine, L-Theanine improves strength, endurance and stamina. This promotes better workouts which accelerate fat burn. To add icing to the cake, L-Theanine reduces triglycerides levels.


Vitamin B6 ( 1.8mg)
Vitamin B6 is vital in the breakdown of fat cells and protein molecules as well as glucose synthesis. It stimulates lipids metabolism, promoting more fat burn and release of energy.
Riboflavin (1.3mg)
Riboflavin (Vitamin B2) facilitates the breakdown of carbs, fats and protein into energy. It maintains the body’s supply of energy. It converts carbohydrates into adenosine triphosphate (ATP)- a compound that stores energy in muscles.
Thiamin (1.3mg)
Thiamin (Vitamin B1) supports your metabolism by facilitating the conversion of carbohydrates and fats into glucose and energy. It is one of the B vitamins that help the body to manage stressful situations and boost cognitive function.
Vitamin B12 (10mcg)
Vitamin B12 promotes red blood cell formation, hence, prevents anaemia. Also, it improves mood by playing a significant role in the synthesis of serotonin- a hormone that regulates mood. Research shows that vitamin B12 deficiency is associated with depressive symptoms. Additionally, it plays a vital role in the synthesis of carbs and fatty acids and energy production. It increases energy levels by facilitating the absorption of folic acid.


Magnesium (80mg)
Magnesium is important for your weight loss and gym goals. It is responsible for regulating blood sugar, contracting muscles, conducting nerve impulses and producing energy. It is also crucial for your bones and teeth. How about weight loss? Magnesium controls glucose and insulin blood sugar levels. Insulin resistance is associated with weight gain.Besides, this mineral will support your physical performance. It is a significant co-factor in the production of ATP, which facilitates the conversion of food into energy.
Zinc (15mg)
Zinc is an appetite suppressant. It lowers ghrelin hormone, which is responsible for hunger pangs. Additionally, it promotes protein synthesis, which increases metabolism; a high metabolic rate results in more calorie burn.

Health And Well Being

Panax Ginseng (10:1)(1200mg)
Panax ginseng has been seen to promote higher energy levels and fight fatigue. It can enhance your exercise by reducing oxidative damage.
L-Tyrosine (200mg)
L-Tyrosine is known to enhance attention, focus and alertness.
Ginkgo Biloba leaf powder (120mg)
Ginkgo Biloba is rich in antioxidants that prevent free radical damage. Research shows that ginkgo Biloba may improve mental performance, lower anxiety and improve blood circulation in the body. Increased blood flow boosts calorie-burning exercises.
Black pepper extract (4:1)(24mg)
Black pepper improves the absorption of other nutrients in the blood.
Niacin (20mg)
Niacin (vitamin B3) helps to convert food into energy and support cellular metabolism. Besides, studies 7 show that niacin lowers triglycerides by about 20 to 50 percent.

How Does Phentaslim Work?

phentaslim package

The manufacturer states that Phentaslim targets weight loss in six ways.

Suppresses hunger

Phentaslim contains ingredients that lower your cravings, to prevent snacking between meals.

Boosts metabolism

It increases your metabolism, which stimulates faster fat burn.

Improves mental clarity

Phentaslim will keep you motivated and support your performance.

Boosts health

Phentaslim contains potent vitamins, minerals and antioxidants that will improve your immune and health.

Increases energy

Phentaslim increases energy levels and powers your workouts throughout the day.

Burns calories

This fat burner promises to inhibit additional fat storage and weight gain by burning excess calories.

How To Use Phentaslim?

Each bottle contains 90 capsules.

You should take 1 capsule shortly before breakfast, 1 capsule before lunch and 1 capsule before dinner.

Take every capsule with a glass full of water.

If you are sensitive to caffeine, start with 1 capsule per day to evaluate tolerance; do not take after 5 pm.

You should not exceed the recommended daily serving.

Are There Any Phentaslim Side Effects?

The manufacturer notes that Phentaslim contains caffeine and should not be taken in the evening because it may disrupt sleep.

Also, it should not be taken by individuals with a body mass index of less than 18.5, pregnant, breastfeeding or under 18 year of age.

Phentaslim Reviews: What People Say About This Product?

phentaslim pills

There are a few independent reviews online.

One user writes:

I used this product after doing a lot of research and checking reviews. I needed something that would suppress my sugar cravings that had little or no side effect […] Phentaslim has worked for me; I knew it wasn’t a diet supplement or meal replacement. I purely needed help with irrational cravings, and thankfully it worked for me. I had no side effect other than having no sugar cravings and feeling fuller meant I didn’t snack between meals and most of the time started wanting to have healthier meals.

Most users shared positive testimonials, but some experienced side effects.

Another user says:

I have been taking this product for a week. I have stopped taking it because of the profuse sweating, nausea and dizziness that I have experienced since day one.

Phentaslim: Packages, Pricing and Where to Buy

phentaslim website

Phentaslim is available on the official website:

Payment is fulfilled through PayPal and credit/debit payments.

The manufacturer offers free shipping worldwide.

How much does it cost?

  • 1 bottle: $49.00
  • 2 bottles +1 bottle free: $98.00
  • 3 bottles + 2 bottles free: $147.00

Money-Back Guarantee and Refund Policy

Phentaslim comes with a 60-day money-back guarantee.

Phentaslim Pros and Cons


  • Contains natural ingredients.
  • Transparent label.
  • Free shipping.
  • 60-day money-back guarantee.


  • Potential side effects due to caffeine.
  • Lacks clinical backing.
  • Only available online.

Phentaslim Review: Should You Buy It?

phentaslim supplement

Phentaslim contains some powerful fat burning ingredients that target fat by increasing metabolism and suppressing hunger pangs.

More so, it increases your energy levels and boosts health.

Phentaslim works bests when combined with a healthy diet and physical training.

Besides, it comes with a 60-day refund policy and free delivery.

Read next: Alpha Lean 7 Review 2023: Should You Buy It?

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