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Protein Empire T5 Fat Burner

Protein Empire T5 Fat Burner is described on the official site as fuel for weight loss. It contains an array of ingredients, several of which are stimulants. One ingredient, Citrus aurantium, has been linked with severe side effects in the past.


Protein Empire T5 Fat Burner Pros
  • There have been some early clinical trials that have associated a few of the ingredients with weight loss
  • Easy to use capsules
  • It is stated that the product is manufactured in the UK to GMP standards
  • Some information provided on people who shouldn’t take the supplement
Protein Empire T5 Fat Burner Cons
  • No clinical studies have been undertaken on the product as a whole
  • The majority of the ingredients in the product have not been shown to aid weight loss
  • One of the key ingredients, Citrus aurantium (and its active ingredient, synephrine) has been associated with severe, potentially life-threatening side effects
  • Ingredient quantities are not disclosed on the official website

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Protein Empire T5 Fat Burner Review

Protein Empire T5 Fat Burner is a capsule supplement containing a range of herbal ingredients, including several stimulants. The supplement is claimed by the company behind it to work as a fat burner, metabolism booster and energy enhancer. There are a number of claims about the potential effects of the Fat Burner on the official website, but none are backed by scientific evidence.

An ingredients list is provided for the product, but individual ingredient quantities are not disclosed. It is also very important to note that the product contains Citrus aurantium – an ingredient that has been banned for use in supplements by the FDA because it is thought to be dangerous with the potential to trigger severe side effects.

Protein Empire T5 Fat Burner Claimed weight loss benefits

It is claimed on the official web page that this supplement supports healthy weight loss and boosts energy when the user is working out. More specific claims on the official site claim that the product acts as a fat burner, metabolism enhancer, energy booster, and that it can help to suppress hunger. The supplement is therefore claimed to target three of the five key areas of weight loss. It is even claimed that Protein Empire T5 Fat Burner can target ‘your most stubborn fat areas that can’t be targeted by exercise alone’. There is no scientific evidence provided to support any of these claims.

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How Protein Empire T5 Fat Burner Works


The official product website claims that this supplement can help with several areas of weight loss: fat burning, metabolism boosting and appetite suppression. It is also claimed to boost energy levels and so improve exercise performance. A few of its ingredients are noted as helping with these effects: caffeine, capsicum and green tea, ‘and other natural ingredients’. It is not however described in any more detail how these ingredients are thought to aid weight loss. Some of the ingredients in the product have been tentatively linked with weight loss, but none have been proven to work in the ways described by this company.

How Each Ingredient Works

Caffeine Anhydrous

Most people are aware that caffeine is a stimulant, meaning that it causes increased energy levels by activating the central nervous system. This impact on the body is sometimes said to have knock-on effects for weight loss. Caffeine consumption has been said to increase the metabolic rate and the rate of fat burning, potentially helping the body to burn more calories than usual. There are also claims that caffeine can help to suppress the appetite. Finally, the ingredient has been linked to improved exercise performance, due to a boost in energy levels and concentration.


In terms of weight loss, L-carnitine is principally believed to help to increase the process of fat burning. The ingredient is thought to play a role in the breakdown of fats in the body and is said to help increase the rate at which this occurs when it is taken as a supplement. As an amino acid, there is also suggestion that L-carnitine can improve body composition when taken alongside a resistance exercise programme, potentially aiding the growth and repair of muscle tissue.


L-tyrosine has been suggested to have similar effects on the body as stimulant ingredients. It is believed to activate the central nervous system and potentially increase energy levels and boost the metabolism – effects described for several other ingredients in Protein Empire T5 Fat Burner. L-tyrosine has also been associated with improving mood, perhaps causing a reduction in stress eating and helping users to stick to a calorie-controlled diet. Finally, the ingredient has been said to improve body composition if taken alongside regular resistance exercise.


Ingredients extracted from the genus Capsicum are thought to have thermogenic effects. Thermogenic ingredients are believed to increase the internal body temperature which in turn is said to provide a better environment for fat burning enzymes and for cells in general. This supposedly helps to increase the efficiency of the body’s fat-burning process as well as the metabolism. There have also been claims that Capsicum extracts can help to suppress the appetite, possibly helping users to snack less following intake.

Citrus Aurantium powder

This ingredient, perhaps better known as bitter orange, cintains an active chemical substance called synephrine. It is synephrine that is thought to have the weight loss effects. Synephrine is a type of stimulant and works by triggering the ‘fight or flight’ response – increasing the heart rate and blood pressure. This in turn is believed to increase the metabolism and potentially boost fat burning, while also providing the body with a boost of energy. Other unofficial sources have stated that the ingredient can help to suppress the appetite. There effects have not been proven in reliable clinical studies.

Green Tea Leaf Extract

Green tea is often claimed to have weight loss effects. As with several of the ingredients in Protein Empire T5 Fat Burner, green tea leaf extract has been associated with an increase in the metabolic rate, and increase in the rate of fat burning, and the potential to suppress the appetite. It is not often stated precisely where these effects come from; some unofficial sources state that it is the caffeine content of green tea that has weight loss effects while others attribute the potential effects to the catechins and polyphenols in green tea, such as epigallocatechin gallate (EGCG).

Black Pepper Extract

Black pepper, or Bioperine, as it is called in this supplement, is sometimes claimed to have fat burning effects on the body. The ingredient contains a substance known as piperine which is claimed to block the formation of new fat cells thus, in theory, preventing (or reducing) fat gain. As discussed in the ‘Clinical Studies’ section below, this effect has not been proven in reliable clinical studies on the ingredient.

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Key Protein Empire T5 Fat Burner Ingredients

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The official Protein Empire T5 Fat Burner web page does appear to provide a full ingredients list, but there is no mention of the quantities of each individual ingredient in a serving of the supplement. It is claimed that the product is made with ‘the best possible ingredients’. Customers are told that there is 200mg caffeine per serving, and that you should only take 400mg caffeine per day. There is however no mention of the amount of Citrus aurantium in the product; this is thought to be a powerful stimulant that can cause severe side effects.

Active Ingredients

Caffeine Anhydrous

Caffeine is a household name since it is often included in products consumed by many on a daily basis, such as tea, coffee and coca cola. Caffeine is a stimulant; it has an effect on the central nervous system and is thought to boost energy levels and concentration levels, for a short period of time. It is sometimes added to weight loss supplements because it is believed to have metabolism boosting effects. The ingredient has long been used in traditional herbal supplements for the treatments of conditions such as headaches and the common cold.


L-carnitine is a type of amino acid (considered to be the building blocks of protein, and in turn, of muscle tissue). L-carnitine is produced by the human body and so all humans contain a certain amount naturally. It is also easy to find in supplement form; this is because the substance has been linked to the prevention and treatment of a number of different health conditions. Most commonly, these supplements are used to treat cardiovascular problems, such as heart failure, chest pain, heart attack and high cholesterol.


L-tyrosine is a form of amino acid. Amino acids are known as the building blocks of protein (and so muscle tissue) and are found naturally in the body and/or in foods that we eat on a regular basis. L-tyrosine can be found, for example, in meat, fish, beans and wheat. It is also available to purchase in supplement form because the ingredient has been claimed to treat a range of mental health conditions. These include: depression, attention deficit disorder, stress, and Alzheimer’s disease. The supplement has also been linked to improvements in Parkinson’s disease and cardiovascular problems.


Capsicum is the scientific name for a genus of plants, which includes a range of red pepper species. Cayenne pepper, for example, is an extract of Capsicum that is commonly found in people’s food cupboards and used for flavouring cooked meals. Capsicum extracts contain the chemical capsaicin, which is believed to have a range of health benefits. The ingredient is thought to help to reduce feelings of pain as well as treating gastrointestinal problems, arthritis and diabetes, among many other conditions.

Citrus Aurantium powder

Citrus aurantium is sometimes known as bitter orange. It is an ingredient extracted from the skin of the bitter orange fruit. The ingredient contains synephrine, which is thought to be the active chemical, and is sometimes included in weight loss supplements because it is believed to have metabolism boosting and fat burning effects. Synephrine has been banned for use in supplements by the FDA because it has been linked with several very severe side effects. In traditional herbal medicine, the ingredient has been said to be beneficial in the treatment of a range of different health conditions.

Green Tea Leaf Extract

Green tea is an ingredient that has long been touted for its claimed beneficial effects on the human body. The extract is taken from the leaves of the Camellia sinensis plant, which are used to make a range of different tea-based beverages. Green tea is commonly consumed in its drink form around the world but is also easy to find in supplement form on its own and within weight loss supplements. Among its claimed health benefits are effects such as improving the efficiency of the immune system and helping to prevent cancer.

Black Pepper Extract

Black pepper is another household name – a product commonly sold for use in flavouring meals. The ingredient is made from an extract of the unripe fruit of the Piper nigrum plant. In traditional herbal supplements, black pepper has been claimed to help with the treatment of supset stomach and bronchitis; it is also thought to help prevent cancer. The ingredient is said to have germ-fighting capabilities, potentially helping to protect the body from harmful microbes, particularly in the gastrointestinal tract.

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Clinical Studies

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It does not look as though any clinical trials have been performed on Protein Empire T5 Fat Burner as a whole product and no clinical studies are referred to on the official product site. Most of the ingredients in the supplement have been part of some clinical trials, though most of these are early trials and none of the results can be considered definitive.

A clinical study is a method used to test the safety and/or effectiveness of a substance or group of ingredients in a product. The trials are performed by scientists in a controlled environment, typically involving a control group and a treatment group.

Clinical Studies On Each Ingredient

Clinical Studies on Caffeine Anhydrous

Caffeine has been involved in a number of clinical trials that have looked at the ingredient for a variety of different health reasons. Several have considered the impact of caffeine on weight loss and related factors. A study published in 1989, for example, considered the impacts of caffeine on thermogenesis and energy expenditure. The authors for the trial found that caffeine might have beneficial effect on boosting energy levels and causing thermogenesis.

A second trial, published in 2011, looked at the effects of caffeine consumption on energy intake and appetite levels. Sixteen female and 17 male subjects took part in this trial; they were all allocated a certain amount of caffeine alongside their breakfast. Later in the day, they were given a buffet-style lunch and the amount they consumed was recorded. The results of this study indicated that caffeine consumption could help to decrease the amount of food consumed later in the day. In another trial, published in 2001, it was concluded that caffeine might have a beneficial effect on several factors linking to weight loss, but that the ingredient has not been definitively proven to be a useful treatment for obesity.

Clinical Studies on Capsicum

Some clinical trials have looked at the potential impact of Capsicum and its related plant extracts on body weight. A number of these have specifically studied capsaicin – the active chemical in Capsicum ingredients.

In 2003, a study was undertaken to look at whether capsaicin has a significant impact on body weight regain after a period of weight loss. The scientists used randomised, double blind, placebo controlled methods and the trial involved a total of 91 overweight participants. The subjects were split into two groups; the first group took capsaicin while the second took a placebo for a three month period. This trial began after all subjects finished a four-week period of a very-low-energy diet. The scientists took measurements throughout the study to see if there were any differences with capsaicin supplementation. The results did not highlight any significant different in body weight regain between the two groups. However, it was implied that capsaicin could help users to significantly increase fat burning when compared to placebo.

There is also a selection of trials that have looked at the impacts of capsaicin on appetite and hunger. One study, published in 2005, considered the effects of capsaicin on satiety and food intake. This trial involved 24 male and female subjects, who were given capsaicin in the form of red pepper or a placebo. The allocated treatments were taken half an hour before a meal and they recorded their huger and satiety levels. It was found that taking casaicin before a meal could significantly increase satiety and reduce the amount of calories consumed when compared to a placebo.

Clinical Studies on Flax Seed Powder

Some early studies have been undertaken to investigate the potential health effects of flaxseed supplementation, but very few seem to have been performed with the aim of finding out whether or not the ingredient can contribute to weight loss. One study found that the substance could help to support healthy weight loss, but this trial was later retracted – suggesting that it was not reliable.

Clinical Studies on Citrus Aurantium powder

Bitter orange and its active component, synephrine, have been part of some early clinical studies that have looked at both the safety and effectiveness of the substances. A 2004 review study was published that looked at any trials that had been performed on the ingredient to date. The authors found just one trial that was randomised and placebo-controlled in design. The results of this one study did not show any significant effects of synephrine on body weight. In 2006, another review study was published. It was found in this study that some studies indicated positive effects of bitter orange, but that more rigorous studies are required before any definitive answers can be drawn from the research.

Looking at the safety of the ingredient, one trial noted that the ingredient can cause hypertension, variant angina, tachyarrhythmia, heart attack, cardiac arrest, and even sudden death (this was just a selection of the negative side effects experienced by users). Due to a lack of reliable studies on the ingredient’s safety, it was concluded that the exact cardiac effects of synephrine are not yet known.

Clinical Studies on Green Tea Leaf Extract

Green tea extract has been subject to more clinical study than most of the ingredients in this product, but still, not enough reliable trials have been performed to draw any firm conclusions on the topic of its effectiveness for weight loss. Since we don’t have space to discuss all the studies that have been performed on green tea, we can look at a meta-analysis. Meta-analyses are studies that gather together the data collected from a selection of trials performed on an ingredient. Usually, the authors only collect data fom trials that used reliable methods (randomised, double blind, placebo controlled studies). They then perform statistical analyses on this much larger dataset.

For green tea and weight loss/weight maintenance, a meta-analysis was published in 2009. The authors found a total of 11 reliable-enough studies that they could include in their analyses. It was found that the catechins in green tea might have a notable impact on body weight and weight maintenance after a period of weight loss, but that this impact only appears to be small – perhaps not as significant as some supplement companies imply.

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Protein Empire T5 Fat Burner Side Effects

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The official Protein Empire website does not list potential side effects associated with the T5 Fat Burner. It does however note that all users should consult a doctor before taking any supplements, especially if you are taking medication or have an existing medical condition. It is added that you should discontinue use and contact your GP if you suffer an adverse reaction. Despite a lack of information on side effects, it is important to note that most of the ingredients in the product have been linked to some adverse effects; bitter orange in particular has been associated with severe cardiovascular events and even death.

Side Effects Associated With Each Ingredient

Side Effects associated with Caffeine Anhydrous

There is a long list of side effects associated with caffeine. In small amounts, the ingredient may not cause severe side effects. In the quantities found in supplements however, it might have negative health implications. For example, caffeine can cause headaches, stomach problems, nausea, vomiting, ringing in the ears, irritability, confusion, insomnia and difficulty sleeping, and changes in mood. More seriously, side effects such as increased heart rate, increased breathing rate, increased blood pressure and irregular heartbeats have been linked to the ingredient. As such, it is not recommended that pregant or breastfeeding women take caffeine supplements. If you have a pre-existing health condition, it is recommended that you consult a GP before taking the ingredient.

Side Effects associated with L-Carnitine

L-carnitine is thought to be safe for use when consumed in the amounts commonly found in foods. There are some side effects associated with the ingredient; these include: stomach upset, vomiting, nausea, heartburn, diarrhoea and seizures. There has also been suggestion that L-carnitine supplementation can cause a “fishy” odour of the urine, sweat and breathe of the user.

Side Effects associated with L-Tyrosine

Tyrosine is considered probably safe for consumption in amounts commonly found in foods. In higher amounts (up to 150mg/kg per day) it is thought to be possible safe for up to three months. When taken In higher doses or for longer periods of time, it is not known how safe the ingredient may be. Some side effects have been linked to consumption of L-tyrosine; these include: headachesm fatigue, nausea, heartburn and joint pain. It is not recommended for supplementation by pregnant or breastfeeding women.

Side Effects associated with Capsicum

When consumed in the amounts commonly found in foods, Capsicum is not likely to cause severe side effects, particularly in the short term. In larger doses and for longer periods of time, Capsicum might however be unsafe. The ingredient has been associated with side effects including, for example, upset stomach, stomach pain, runny nose, flushing and sweating. In rare cases, it has been suggested that Capsicum can cause liver and kidney problems.

Side Effects associated with Citrus Aurantium powder

The authors of a 2011 clinical study noted that a selection of severe side effects have been associated with synephrine, the active chemical in Citrus aurantium. According to the study, there have been reports of hypertension, tachyarrhythmia, variant angina, QT prolongation, cardiac arrest, myocardial infarction (heart attack), ventricular fibrillation, and sudden death. It is highlighted that there has not been enough research on the ingredient to determine its safety.

Synephrine has been banned for use in supplements by the US Food and Drug Administration (FDA). The National Institutes of Health (NIH) states that products containing Citrus aurantium are not safe, listing side effects such as stroke, heart attack, and fainting. Pregnant and breastfeeding women should not take this ingredient. The ingredient may be particularly unsafe when taken with other stimulants like caffeine (which is present in Protein Empire T5 Fat Burner).

Side Effects associated with Green Tea Leaf Extract

When taken in the amounts found in green tea in beverage form, this ingredient is not thought to be harmful. If taken in high quantities regularly however, green tea might cause some adverse side effects. Since it contains caffeine, the ingredient can cause all of the side effects mentioned for caffeine above. It can also cause additional side effects linked to long-term use, such as stomach upset and constipation. There has been suggestion that the ingredient can cause liver problems, but this suggestion has not been proven.

Side Effects associated with Black Pepper Extract

Again, when used in food amounts, black pepper is thought to be safe. It is considered possibly safe for people when taken in medicinal amounts. Side effects may include a burning aftertaste. The ingredient is not recommended for pregnant or breastfeeding women.

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How To Use

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The official Protein Empire website does offer some brief instructions on how to use the T5 Fat Burner. It is stated that adults should take a maximum of two capsules a day. One capsule should be taken with a large glass of water when the user wakes up first thing in the morning (at least half an hour before breakfast) and the second capsule should be taken around half an hour before the user eats lunch.

The official site does offer some cautions. It notes that users should always consult a GP before taking supplements, especially if they are taking any medication or have an existing medical condition. The company notes that the product is not suitable for pregnant or lactating women, and that the supplement should not be taken in place of a healthy, balanced diet and lifestyle.

Each capsule contains 200mg caffeine; it is stated on the official product site that no more than 400mg caffeine should be consumed per day from all sources; if you are taking the supplement, you should therefore cut out all other dietary sources of caffeine. If you suffer an adverse reaction, you should stop using the product and consult a doctor. It is further added that those with hypertension, heart disease, or sleep problems should avoid the product because of the caffeine.

The official site does not mention the potentially life-threatening effects of Citrus aurantium. Because of the side effects associated with this ingredient, we do not recommend that anybody use this product.

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Who Makes It

The T5 Fat Burner supplement is made by the company Protein Empire. This company appears to be based in Northampton in the United Kingdom. In the ‘about us’ section of the website, it is stated that the company offers “everything you need to stay fit and healthy and accomplish your goals”. They supposedly have many years of experience in the fitness and supplement industry. It is stated that they guarantee “premium quality” supplements, great prices, friendly advice, exceptional customer service and fast shipping.

A phone number is provided on the official site, but other than that no contact details are provided. There is no email address or postal address. Customers do have the option to get in touch with the company via an online form. The company claims to offer a money-back guarantee, but this is only available for 14 days and on unopened items, so is more of a returns policy than a money-back guarantee.

Payment appears to be safe and the company guarantees that their prices cannot be beaten for the exact same products. This makes sense since their exact products do not appear to be sold through any other companies.

The company fails to provide some important information about its products, including ingredient quantities and the potentially life-threatening side effects associated with one of the ingredients.

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Where To Buy Protein Empire T5 Fat Burner


The official Protein Empire T5 Fat Burner webpage sells the supplement for £19.99. This is for one bottle of the supplement, which appears to contain 60 capsules and so, if taken as directed, should last the user one month. The company does not appear to offer any multi-buy discounts, charging the same price per bottle no matter how many you purchase.

The supplement is available as part of what they have named a “fat loss collection”, which includes one bottle of T5 Fat Burner capsules and a tub of whey protein. This costs £29.99, supposedly saving the customer £12.97 compared to if the two products were purchased separately.

Shipping costs £2.49 for vitamins and tablets or £4.99 for protein and powders. Shipping is with Royal Mail and should take 1-3 working days. Customers are offered free 24-hour delivery if they spend over £50. For international orders, customers are asked to email the company and they will provide more details.

The product only appears to be available for sale via the official website. It does not look to be sold by any third-party online retailers or in any well-known high street health retailers in the UK. It is not available on the UK Amazon site; it is sold on eBay, but we do not recommend purchased from this website as you cannot guarantee that you will be receiving the genuine product.

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Does Protein Empire T5 Fat Burner Meet our Approved Criteria

Money-back-guarantee: There is a money-back guarantee, but only for 14 days.

One-off payment: Yes, the payment methods seem to be safe and one-off. Customers can pay using PayPal.

Manufacturing Standard: No, there is no mention of any manufacturing standard certification.

Accompanying Diet Plan: No, there is no mention of a diet plan with this product.

Ingredients and quantities disclosed: The ingredients list is provided, but quantities are not disclosed.

Company contact details readily available: A phone number is provided, but no email address or postal address is disclosed.

Protein Empire T5 Fat Burner does not meet our ‘Approved’ criteria because it fails to provide a 30-day money-back guarantee, no manufacturing standards are provided, there is no diet plan with the product, ingredient quantities are not disclosed and company contact details are not readily available.

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Overall Verdict

Protein Empire T5 Fat Burner is claimed to have several weight loss effects. The product has a long list of active ingredients and some of these have been suggested to have a slight benefit for weight loss in early clinical studies, though none of them have been proven to work in this way. The official website lists the product ingredients but fails to list the individual ingredient quantities. Very importantly, there is no mention of the severe side effects (like heart attack and sudden death) that have been reported for one of the active ingredients in the supplement – Citrus aurantium. We do not recommend this product on the grounds of safety concerns.

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