Protein World Review: Does it Work?

Expert rating: stars-icon     By Natalie K (Senior Reviewer) September 13, 2023       Advertising Disclosure

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 What is Protein World?

Protein World is a weight loss brand offering a fat metabolizer, meal replacement, appetite suppressant, fatty acids, and a cleanser. The diet pill supplements feature stimulant ingredients, fiber, and other common weight loss additives.

The company claims that these brands can raise energy, boost metabolism, help the body tone up, and help flush out toxins. This review will go over the quality of ingredients, whether or not results are likely, customer opinions, and more. Our review experts have reviewed several types of meal replacements and found the most effective for weight loss was 18Shake. It has only natural ingredients and high fiber and protein to both suppress appetite and provide healthy amino acids. Discover more about 18Shake when you visit the link provided here.

Protein World Diet Ingredients and Side Effects

Here are some noteworthy ingredients found in the meal replacement and diet pills:

Green Tea Extract Guarana Extract Sucralose Caffeine Anhydrous Yerba Mate Powder
Alpha Lipoic Acid Cayenne Powder Konjac Glucomannan Garcinia Whole Fruit Powder L-Tyrosine
Choline Whey Protein Concentrate Sunflower Lecithin

Green Tea Extract: Plant extract that is often brewed as a tea, it has antioxidants and stimulants. The National Center for Complementary and Integrative Health has reviewed it and concluded:

“There have been some case reports of liver problems in people taking concentrated green tea extracts”

They warn that abdominal pain, yellowing of the skin and dark urine are signs of a serious liver problem. Healthy people have suffered from organ related damage from green tea extract.

Though it is used for weight loss, the same group adds:

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Web MD has also expressed a warning:

“POSSIBLY UNSAFE when taken by mouth long-term or in high-doses”

It can contribute to side effects such as:

  • Headaches, insomnia, and restlessness.
  • Ringing in the ears, anxiety, and tremors.
  • Cold sweats, jitters, and insomnia.
  • Convulsions, confusion, and mood swings.
  • Rapid heart rate, irregular heart rate, and cardiovascular issues.
  • Diarrhea, vomiting, and nausea.
  • Irritability, depression, and withdrawal symptoms.

It’s known that the only reason it might promote weight loss is due to caffeine, which is not a long lasting or potent ingredient for fat loss.

Guarana Extract: This plants seeds are found in the Amazon, it contains stimulant compounds used to increase energy, raise metabolism, and promote fat burning.

It contains stimulants such as caffeine, theobromine, and theophylline. Web MD adds:

“Guarana is POSSIBLY UNSAFE when taking it by mouth in high doses for a long time”

It may lead to side effects that include:

  • Tremors, confusion, and muscle twitches.
  • Stomach irritation, headaches, and anxiety.
  • Restlessness, rapid heart rate, and delirium.
  • Ringing in the ears, migraines, and stomach cramps.
  • Irregular heartbeat, vomiting, and nausea.
  • Rapid breathing, mood swings, and irritability.

Sucralose: Non-caloric artificial sweetener that is around 1,000 times sweeter than sucrose. The Center for Science in the Public Interest has demoted its status from “Safe” to “Caution”, after studies revealed it can be potentially hazardous.

A study by the Washington University School of Medicine found:

“Sucralose Affect Glycemic and Hormonal Responses to an Oran Glucose Load”

This means blood sugar is raised even though sucralose is not intended to have such an effect. Another study by the Journal of Toxicology and Environmental Health found that it:

“Alters Gut Microflora and Increases Intestinal P-Glycoprotein”

Mice fed sucralose had lowered good gut bacteria that is needed to support the immune system. It also lead to the promotion of P-Glycoprotein, which the body releases when a potential toxin enters.

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Caffeine Anhydrous: A dehydrated form of caffeine that’s often added to weight loss supplements. It’s used to help stimulate the central nervous system, which in turn raises metabolism, boosts energy, and can raise blood pressure.

There’s a total of 400 mg of caffeine per daily serving of Protein World’s stimulant formulas. This meets the advised daily limit proposed by health organizations. For most, this is the highest allowed one can take before extreme side effects are felt.

It can lead to side effects such as:

  • Insomnia, restlessness, and jitters.
  • Rapid heart rate, cardiovascular damage, and difficulty breathing.
  • High blood pressure, difficulty relaxing, and anxiety.
  • Headache, migraines, and mood swings.

Caffeine use leads to tolerance and a lack of effects. notes:

“Many of caffeine’s effects, including fat burning… are subject to tolerance, and may not occur in people sued to caffeine”

Taking more also does not take away from the tolerance factor. Since there’s 400 mg of caffeine total, taking any other stimulants can increase the risk for unwanted side effects.

Yerba Mate Powder: The leaves of this plant are often brewed into a drink. It has stimulant compounds and can stimulate the heart, muscles, and brain. Web MD has also expressed concern over the safety of this additive:

“It increases the risk of mouth, esophageal, laryngeal, kidney, bladder, and lung cancer”

“When taken in large amounts or for long periods of time, yerba mate is POSSIBLY UNSAFE”

It can promote many side effects that include:

  • High blood pressure, migraines, and difficulty breathing.
  • Irregular heartbeat, insomnia, and nervousness.
  • Upset stomach, nausea, and vomiting.

Konjac Glucomannan: Fiber extract taken from the konjac plant. It’s used to regulate blood sugar and suppress appetite.

A study by the Rush University Medical Center found:

“did not promote weight loss or significantly alter body composition, hunger/fullness, or lipid and glucose parameters”

It’s often advised to drink enough fluids with it, as it can promote chocking and blockages. The top 10 list of the best meal replacements are available within this link.

Choline: A kind of B vitamin that is found in common foods such as eggs nuts, meats, and beans. It is used to help regulate the nervous system. Web MD mentions:

“Taking high doses of choline by mouth is POSSIBLY UNSAFE”

It can promote side effects that include:

  • Diarrhea, fishy odor and breath, and sweating.
  • Vomiting, nausea, and increased risk for organ damage.

 Protein World Quality of Ingredients


Many of the additives are already found in many other similar brands. Their diet pills are full of stimulants, potentially harmful additives, and ingredients which have not been proven to promote weight loss. This includes konjac glucomannan and green tea extract.

There are even added stimulants in the meal replacement, though it’s unknown exactly how much. Total caffeine in the diet pills amounts to 400 mg a day, which with the added shake passes the daily advised limit for caffeine use. A list of the highest rated meal replacement shakes is offered in the link found here.

The Price and Quality of Protein World

Direct sales are offered, and their weight loss package including the appetite suppressant, fat burner, and meal replacement sells for $102. The company fails to mention how long each product lasts.

Still, the kinds of ingredients used are often added to other diet supplements. There is healthy Whey Protein Concentrate added to their meal replacement, but they also add the artificial sweetener sucralose alongside green tea extract and guarana.

The kinds of additives are potentially unsafe, as stimulants can cause many unwanted symptoms. They’re also not long-term solutions to weight loss, as the body quickly creates a tolerance to caffeine.

For the price paid, there are far too many cheap and common ingredients. The only good additives found for weight loss are Garcinia Cambogia and Whey ProteinThe top 10 meal replacement shakes are featured when you click here.

Business of Protein World

The owner’s go by the name of Protein World LTD, they can be contacted via the following:

Address: Kingfisher House, Restmor Way

Hackbridge, Surrey SM6 7AH, UK

Email: [email protected]

The UK’s ASA or Advertising Standards Authority noted that the company made many claims about their brands which were not true. This includes their weight loss pill and their meal replacement.

The ASA stated:

“Nine issues were investigated, all of which were Upheld”

This includes weight loss claims made about their meal replacement, which they found were exaggerated and not proven.

A study by Surrey Trading Standards stated:

“We will investigate Protein World because the reports show that this isn’t just a food labeling problem, it is potentially fraud”

This was due to a scientific study which saw that they had 17 times more carbohydrates in their meal replacement than what’s stated on the nutrition facts label. Our expert reviewed top 10 list features the best meal replacements.

Reviews of Protein World

Here are some reviews for Protein World’s products:

“didn’t help me lose weight and just made me feel crappy and sick”

“I felt dizzy and lightheaded”

“Very high amount of caffeine in these. It gave me the shakes and found it very hard to relax”

“Made me feel so so ill”

Many people had side effects from the caffeinated pills. There were commonly listed symptoms such as headaches, nausea, rapid heartrate, jitters, and nausea.

People also complained about the meal replacement, claiming it was far too sweet and artificial tasting, as well as it failing to suppress appetite. After looking over the reviews of Protein World, it’s clear many thought it was underwhelming.

How Does Protein World Compare?
  • Product Name
  • User Rating
  • Has Good Appetite Suppressant
  • Has Only Natural Components
  • Good Taste
  • Protein World
  • 42 /100
Conclusion – Is Protein World Good for Losing Weight?

Before making a decision on the Protein World diet, one should go over the quality of ingredients, customer reviews, and company history. The manufacturers have had warnings from the UK government for making false weight loss claims. The majority of reviews for both the diet pills and meal replacements are negative. Reviews of Protein World have many users complaining about side effects and a lack of weight loss benefits.

The 2024 meal replacement of the year was found to be 18Shake. It’s all-natural meal replacement made with 15 grams of duo whey protein, appetite suppressing fiber, well rounded vitamins and minerals, and no stimulants. Customers have said it mixes well, suppresses appetite, and tastes great.

18Shake is backed by a full 30 day risk free guarantee. To learn more about 18Shake, click the link here.

9 Responses to Protein World Review

Percy says:

I got this product some 6 weeks ago, and have been very consistent with its direction. NO EFFECT AT ALL!!

Alexandra says:

Good taste, NO effect. Waist of time and money 🙁

do not buy says:

Using this product for 1 month, shake taste is good but nothing happened… followed strictly with exercise
no weight lost, no muscled gained. waste of money

Anonymous says:

Shake taste good but made my tummy very bloated one week I was constapated the next I had diorriah this product is crap just cloggs you up do not buy this product waste of money!!

alicia says:

i spent over $300 on protein world and after all the disgusting shakes and cravings i tried to fight through it. after 2 months i saw NO IMPROVEMENT in my weight. I should have read this article before i bought their products.

Alex Frazier says:

My daughter purchase their Protein Shake without doing any research on the company. After doing her research she found articles saying how bad the product was. With this information there was no need to use the product. We contacted them by email because they would answer the phone. We ask for return label so we can return the product. They emailed a return label but without shipping being paid. We contacted them again and asked them for a prepaid shipping label and there response was .”You Have To Pay For Return Shipping “. That statement says it all about that company. I am telling anyone who will listen,”Don’t By Anything From This Company “. Just terrible customer service, just terrible!!

Dayana Jamil says:

Shameless thieves . Stole money and never shipped anything . Act like they shipped than they said they lost after gave me fake tracking numbers. And than they blocked me eveywhere

Nika says:

Product destroyed my system and made me sick.

Ugh says:

You can’t even unsubscribe to an item until it shows in your subscriptions. Before you know it, it’s too late and they’re shipping it out. You can get a refund but they don’t even reimburse you for shipping (I live in the US and have to ship it back to the UK) even after I told them I only wanted a one time purchase even when they signed me up for a subscription.

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