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Protein World Vegan Slender Blender

Protein World Vegan Slender Blender is a protein shake product derived principally from pea protein. The product is vegan, gluten free, and lactose free, but contains a number of ingredients that might cause side effects in some users.

Protein World Vegan Slender Blender Pros
  • The company sells a range of different health supplements for those looking to lose weight or improve athletic performance
  • Pea protein, the key ingredient, has not been associated with any severe side effects
  • The product is vegan and gluten and lactose free
  • Some clinical studies have linked caffeine, present in the shake, to improved athletic endurance
Protein World Vegan Slender Blender 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 or aid athletic performance
  • The official website does not make any mention of potential side effects or people who should not take the shake
  • No money-back guarantee available

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Protein World Vegan Slender Blender Review

Protein World Slender Blender is described as a smooth and delicious shake that can help to boost the user’s protein intake for use in the morning, as a snack or post-workout. The product is suitable for most groups of people, being vegan, gluten free, lactose free and soy free. It is also stated to be suitable for diabetics.

The protein in the product is sourced principally from peas. The product might help to increase protein consumption but the key ingredient has not been involved in many scientific studies. The vegan protein shake also contains an array of other ingredients, ranging from amino acids to guarana and green tea (both of which are sources of caffeine).

Protein World Vegan Slender Blender Claimed weight loss benefits

The official product website does not claim that Protein World Vegan Slender Blender has any weight loss properties. It is stated that the shake can give you an ‘inner glow and outer swagger’. More generally, protein shakes are thought to have weight loss and muscle gain properties when consumed alongside a well-balanced diet and regular, intense exercise. This is indicated on the Protein World website as it is stated that the shake can be (though does not have to be) taken after a workout.

Some additional ingredients in the product, such as green tea extract and guarana, have been associated with weight loss in the past, though these potential effects have not been proven in scientific studies. They also both contain caffeine, which has been said to aid athletic performance.

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How Protein World Vegan Slender Blender Works


The official product website does not state directly what the Protein World Vegan Slender Blender is designed to achieve. Based on its ingredients list and the claims of protein shakes more generally, the shake might be thought to act as a weight loss agent and a product that can increase muscle mass and benefit recovery from exercise.

Green tea extract and guarana, two ingredients in the shake, have been associated with weight loss through increasing the metabolism, increasing fat burning, and suppressing the appetite. Caffeine might also improve athletic performance. Supplementing the diet with pea protein, if taken alongside regular intense exercise, might help to increase muscle gain and recovery, thus aiding overall body composition.

How Each Ingredient Works

Pea Protein

Pea protein is commonly used as a muscle building supplement, particularly by those who are vegetarian and/or lactose intolerant. The ingredient contains a number of different amino acids – the substances that act as building blocks for protein and so muscle tissue. Consuming pea protein alongside regular resistance exercise is therefore thought to help to boost muscle gain. The ingredient has also been linked to improved recovery time.

Protein might also have some weight loss benefits; it could act as an appetite suppressant and has been claimed to have fat-burning properties. Moreover, in the long term, if pea protein helps a person to increase their muscle mass, it might lead to an increased metabolism. This is because muscle requires more energy for day-to-day function than fat tissue, so improving body composition might help the body to burn more calories when at rest.


Thiamin belongs to the family of B vitamins. B vitamins are said to be important for muscle maintenance and the metabolism of proteins. It is claimed, therefore, that the ingredient can help muscles to develop and grow. For the same reason, thiamin might also aid with the recovery of muscles following exercise. The ingredient does not appear to have a strong association with weight loss, but is claimed to have effects that could help to improve overall body composition.

Chromium Picolinate

Chromium picolinate is commonly added to weight loss supplements and has been claimed to have a variety of different weight loss effects. The ingredient is said to act as a fat burner, increasing the speed at which body fat is broken down for energy. It has also been claimed to help in the stabilisation of blood glucose levels; this in turn has been said to help to suppress cravings for food following a meal, particularly if the meal was high in carbs. Some also believe that chromium picolinate supplementation can help to increase muscle gain.

Guarana Extract

Guarana extract is a natural source of caffeine. Caffeine is believed to have beneficial qualities for weight loss and athletic performance. In terms of weight loss, the ingredient is thought to cause an increase in cell activity – helping body cells to work at a faster pace, thus burning more calories for energy whilst the body is at rest. Similarly, caffeine has been said to increase the speed at which fat cells are broken down. Caffeine has also been associated with appetite suppression in the past. The ingredient is a stimulant and as such, might help to increase energy levels and improve athletic performance. It might help the user to focus on the task in hand, though this effect would only be only short-term.

Green Tea Extract

Green tea extract also contains some caffeine and so might have the same fat burning, metabolism boosting and appetite suppressing qualities as discussed in the ‘Guarana Extract’ section above. Green tea extract also has a number of potential weight loss qualities associated with its antioxidant content. The polyphenols in green tea, particularly epigallocatechin gallate (EGCG), have been said to provide further weight loss benefits. These substances are thought to increase the process of fat burning and boost the metabolism.


Nicotinamide has been associated with weight loss in the past, though these claims have not been proven in scientific studies. It has been said that nicotinamide supplementation can help to suppress the appetite. It is thought to have an effect on the hypothalamic region of the brain, altering food intake of the user and potentially helping to regulate blood glucose levels. Although unsubstantiated, there have also been claims that nicotinamide supplementation can aid muscle function and help muscle tissue to recover from rigorous exercise.

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Key Protein World Vegan Slender Blender Ingredients

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An ingredients list is available on the official Protein World Vegan Slender Bender product website, but quantities of most of the ingredients are not revealed. The key ingredient appears to be pea protein, though the amount of pea protein. This is supplemented with an array of different amino acids, vitamins and minerals. Some herbal ingredients are also present, including guarana and green tea extract. These herbal ingredients are claimed to be thermogenic, potentially helping to increase fat burning and metabolic rate.

Active Ingredients

Pea Protein

Pea protein, as the name suggests, is a source of protein extracted from peas. Extracted from a plant source, the ingredient is a vegan and vegetarian friendly, gluten and lactose free alternative to some of the more common protein sources used to improve athletic performance and weight loss, such as whey protein and casein protein. Though available in protein powder supplements, the ingredient has not been subject to many clinical studies with regards to its potential muscle building or weight loss properties in humans.

Beta Carotene

Beta carotene belongs to a group of substances known as carotenoids. The chemicals are pigments, but also provide a large amount of vitamin A to consumers. Most people consume a significant amount of beta carotene through their day to day diet; the ingredient is present in many fruits and vegetables. For use in supplements, beta carotene can be made in a laboratory. It is thought to have a range of different health benefits and has been used in the past for the treatment of heart disease, Alzheimer’s disease, and depression, to name just a few.


Thiamin is also known as vitamin B1; it is a soluble vitamin belonging to the large group of B vitamins. The vitamin is used in the body for a range of purposes, including helping the body to turn carbohydrates into energy. It is naturally present in a number of different foods, such as cereals, rice, and meat. It is also commonly sold as a vitamin supplement. Those who are deficient in the vitamin should time thiamin supplements and there has been suggestion that thiamin supplementation can be useful for people with diabetes, heart failure and Alzheimer’s disease.

Chromium Picolinate

Chromium is a mineral that is required by the human body in very small quantities; as such, it is known as a trace mineral. The ingredient is understood to improve the effects of insulin and help to control the metabolism of carbohydrates, fats and proteins. The mineral is present in meat, vegetables and whole-grain foods; it is found in particularly large amounts in broccoli. Due to its relationship with metabolism, the ingredient has been claimed to aid weight loss.

Guarana Extract

Guarana is often added to weight loss and athletic performance supplements. The ingredient is extracted from the seeds of the guarana plant, which has long been used in the Amazon region. Besides its use in weight loss and athletic supplements, the ingredient has also been said to have beneficial effects for low blood pressure and joint pain; it has been used to treat a range of different conditions in traditional herbal medicine. The main effects of guarana are thought to be attributed to its caffeine content, which stimulates the central nervous system.

Green Tea Extract

Green tea extract is another ingredient that is common to weight loss and athletic performance supplements. This extract is taken from the dried leaves of the Camelia sinensis plant – the same plant used to make black tea. Green tea has long been associated with a whole range of different health benefits, ranging from the treatment of depression and gastro-intestinal disorders to prevnting an array of different types of cancer. In terms of weight loss, green tea is thought to increase the metabolism and enhance fat burning; it also contains caffeine.


Nicotinamide is a component of NADH (nicotinamide adenine dinucleotide plus hydrogen). NADH is a naturally occurring chemical in the human body that has an association with the metabolism and production of energy. NADH is available as a supplement on its own, which is sold under the premise that it can help to treat a range of health conditions. These include, for example, high blood pressure, high cholesterol levels, chronic fatigue syndrome, Alzheimer’s disease and Parkinson’s disease. The ingredient has also been said to play a role in increasing immune function.

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Clinical Studies

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Protein World Vegan Slender Blender does not appear to have been subject to any clinical studies as a whole product. Some of the key ingredients have however been subject to preliminary clinical trials to test their effects with regards to weight loss and muscle gain/recovery.

A clinical study is a means of testing whether or not a product or ingredient performs in the way that it is claimed to. In terms of weight loss and athletic performance supplements, clinical trials are usually designed with a test group and a control group, to compare the effects of the product/ingredient with those of a placebo. Before being published in scientific journals, the reports will be checked by scientists.

Clinical Studies On Each Ingredient

Clinical Studies on Pea Protein

In comparison to some of the other protein sources that are commonly used in athletic performance supplements, pea protein has been subject to very few clinical studies designed to test its effectiveness and/or safety. A literature review revealed only one clinical study that was designed with these aims.

In a study published in 2015, the effects of oral pea protein supplementation were tested in a double blind, placebo controlled trial. For this study, the authors compared a particular product that contained pea protein with a whey protein supplement and a placebo. They aimed to see what effects the proteins had on muscle thickness and strength. To achieve this, 161 young, male subjects took part in a 12-week trial. Throughout the trial, the participants followed a resistance training programme that focussed on the upper limb muscles. They were randomly allocated to one of three groups – a pea protein group, a whey protein group, and a placebo group. They each consumed 25g of their allocated treatment twice daily for 12 weeks. Muscle thickness and strength was measured throughout.

The results of this study indicated that, when taken alongside intense resistance exercise, pea protein supplementation could help to increase muscle thickness when compared to placebo. The authors did not report any differences in the results obtained from the pea protein group and the whey protein group. No differences were noted for strength either (between any of the groups, including the placebo group). It was concluded that pea protein supplements could offer an effective alternative to whey protein supplements.

The study indicated that the supplement might be useful for increasing muscle thickness, but not for improving strength. Although this trial has offered some positive results for the use of pea protein as a muscle building supplement, the results of one study are not enough to base a firm conclusion on. Before it can be stated with any degree of certainty that pea protein is a useful athletic performance supplement, more high-quality studies need to be performed on the substance.

Clinical Studies on Guarana Extract

Few studies have directly tested the effects of guarana on weight loss or athletic performance. The ingredient is however high in caffeine – a substance that has been tested to some degree in these capacities. One study, published in 2013, tested the metabolic and performance effects of caffeine consumed alongside endurance exercise. For this study, eight cyclists/triathletes consumed caffeine alone, in coffee, and a placebo, in a randomised crossover trial. The athletes were given caffeine, caffeinated coffee, decaffeinated coffee, or a placebo one hour before beginning a cycling exercise.

The results suggested that caffeine and caffeinated coffee consumption could significantly improve athletic performance when compared to placebo and decaffeinated coffee consumption. With these two treatments, the athletes also exerted more power. The authors concluded that consuming caffeine one hour before exercise could have a significant impact on athletic performance. This effect is regularly reiterated in studies on caffeine and athletic performance.

Most studies linking caffeine to weight loss have involved other herbal components, such as ephedra. There have been a small number of studies designed to test the effects of caffeine on body weight. One such trial, published in the journal ‘Obesity’ looked at the impacts of habitual caffeine intake and green tea supplementation (also present in this product) on body weight loss and maintenance. For this study, a total of 76 overweight and obese participants took part in a randomised, placebo-controlled trial. For four weeks, the subjects were given a very low energy diet. They then took green tea plus caffeine or a placebo every day for three months. After a selection of measurements were taken, it was reported that high caffeine consumers had reduced weight, fat mass and waist circumference. The authors concluded that high caffeine intake could help with weight loss by increasing thermogenesis and fat burning.

Clinical Studies on Green Tea Extract

Green tea extract has been investigated in a number of clinical studies for its potential beneficial effects on weight loss and maintenance. A study was published in 2004 that tested the effects of green tea on weight maintenance. Here, 104 overweight and obese subjects took part in a placebo-controlled trial. The participants all followed a very low calorie diet for four weeks before undergoing a weight maintenance period of 13 weeks. During the weight maintenance phase, subjects were randomly divided to receive either green tea with caffeine or a placebo. It was concluded that weight maintenance after weight loss was not significantly effected by green tea intake.

In another study a sample of women were used to test the effects of green tea extract on metabolic rate and fat burning when taken alongside a low energy diet. The participants were given either green tea or a placebo for 83 days, with standardised caffeine intake. The results of this study indicated that green tea consumed alongside a low energy diet did not have any additional benefits for body weight or composition.

A meta-analysis was published in the International Journal of Obesity in 2009. To produce this report, the authors combined the results of 11 published studies that had tested the effects of green tea on weight loss and weight maintenance. Statistical analyses were performed on the whole pool of results and results obtained. It was found that the catechins present in green tea extract could significantly help with the maintenance of body weight following a period of weight loss and that this effect did not appear to be inhibited by high habitual caffeine consumption. The authors concluded that catechins or an EGCG-caffeine mixture could have a slight beneficial impact for those looking to lose or maintain body weight.

Some studies have indicated that green tea extract and its catechin components could have an effect on body weight, though this effect is only slight and not always deemed significant. It is therefore important that users follow a healthy diet and regular exercise alongside their green tea supplementation.

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Protein World Vegan Slender Blender Side Effects

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The official product website does not mention any side effects that might be caused by Protein World Vegan Slender Blender. This does not however mean that the product won’t cause any side effects at all. A number of the ingredients in the shake are associated with side effects. These are mostly mild in nature, but since ingredient quantities are not always disclosed, it cannot be stated with certainty that the product will be safe for all groups of people. If you are unsure whether or not the product will be suitable for you, ask the company directly for ingredient quantities and contact a doctor before taking.

Side Effects Associated With Each Ingredient

Side Effects associated with Pea Protein

There do not appear to be any reliable sources of information with regards to the safety of pea protein. The ingredient is largely understudied and so it’s side effects are not well understood. In the one study that we could find on the ingredient, the authors did not report any significant side effects encountered by the participants. Taking large quantities of protein can lead to some side effects such as increased bowel movements, nausea, bloating, stomach pain, reduced appetite, thirst, headaches, and tiredness. If you experience any severe side effects or any mild side effects that continue for a long period of time, stop taking the product and consult a doctor. Due to the lack of information on the ingredient, it is best that pregnant and breastfeeding individuals avoid taking the product.

Side Effects associated with Beta Carotene

Whilst beta carotene is thought to be safe for use by most people in appropriate amounts if they have a specific medical condition, WebMD states that taking beta carotene supplements is not recommended and taking high doses can be dangerous. Beta carotene might increase the risk of an individual contracting a range of different health conditions, including cancer. In high doses, beta carotene can also turn skin yellow or orange. Beta carotene is not recommended for anybody who has suffered from angioplasy or has a history of exposure to asbestos.

Side Effects associated with Thiamin

Generally speaking, thiamin supplementation is thought to be safe for most people. Some side effects have however been reported in the past, including skin irritation and allergic reactions. The effects of high doses of thiamin on pregnant or breastfeeding women has not been studied and as such, it is recommended that these groups avoid supplementing the ingredient.

Side Effects associated with Chromium Picolinate

Chromium is required by the body and so in small quantities, is not likely to cause side effects. Supplementing large doses of chromium for long periods of time however is not recommended. Chromium has been reported to cause side effects, for example, dizziness, mood changes, impaired thinking and judgement, nausea, headaches, skin irritation, and impaired coordination. More serious side effects might include liver or kidney damage and blood disorders, though chromium has not been definitively proven as the cause of these problems. Consult a doctor before taking chromium if you have a history of mental health conditions, diabetes, liver or kidney disease, or an allergy to chromate.

Side Effects associated with Guarana Extract

Guarana might not be safe for consumption in high doses for long periods of time. Most of the side effects of guarana are associated to its caffeine content. These include, for example, increased heart rate and blood pressure, tremors, increased breathing rate, stomach problems, nausea, vomiting, headaches, insomnia, nervousness, restlessness, and irregular heartbeats. Consult a doctor before taking if you have a history of cardiovascular problems, mental health problems, bleeding problems, stomach problems, glaucoma, or osteoporosis.

Side Effects associated with Green Tea Extract

In moderate amounts, green tea is thought to be safe for consumption by most people. High doses taken for long periods of time might however cause more severe side effects. These side effects mostly relate to the caffeine content and so are the same as those discussed for guarana above. There has also been suggestion that green tea extract could cause liver problems. For more information on possible side effects, read the ‘side effects associated with guarana extract’ section.

Side Effects associated with Nicotinamide

Nicotinamide is thought to be safe for consumption in moderate doses by most people, though there are some reported side effects for the ingredient. A flushing reaction is common, which might result in itching, redness, headaches, burning, and tingling. This can be exaggerated with alcohol consumption. Some users might also suffer from upset stomach, gas, mouth pain and dizziness, amongst other effects. Serious side effects such as digestive ulcers, lodd of vision, liver problems and irregular heartbeat have been associated with intake of very large doses. Avoid this ingredient if you have been diagnosed with allergies, heart disease, diabetes, gallbladder disease, gout, liver or kidney disease, gastrointestinal ulcers or if you have scheduled surgery.

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How To Use

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The official Protein World website does offer a small amount of advice on how to take the Vegan Slender Blender product. It is recommended that four yellow scoops (40g) of the powder be added to 400ml water or unsweetened nut based milks (like coconut, almond, and hazelnut milk). It is stated that the shake can be consumed in the morning, as a snack, or after a workout.

An ingredients list is provided on the official product website, including nutritional information, but precise ingredient quantities are not disclosed for all components of the protein shake. The shake is supposedly vegetarian, vegan, gluten free, soy free, lactose free, suitable for diabetics, kosher and halal. It does not state anywhere how often you should take the shake. There is also no mention of potential side effects or people who should not use the product for safety reasons.

Based on the ingredients list, we would not recommend this product for all groups of people. If you have a pre-existing health condition, consult a doctor before taking Protein World Vegan Slender Blender. Be particularly careful if you have a history of cardiovascular problems, mental illness, diabetes, bleeding disorders, glaucoma, gastro-intestinal problems, osteoporosis, allergies, or liver or kidney disease. We would also recommend that you consult a doctor before using the shake if you are pregnant or breastfeeding.

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Who Makes It

The product is made by Protein World – a company that sells a variety of supplements designed to aid weight loss or athletic performance. The ‘About Us’ section of the website claims that the company aims to inspire, be real, and work hard. Their products are all said to be ‘pure’ and free from GMOs.

There is no mention of where the products or manufactured or any manufacturing certficates. The company provides some contact details, but these are limited to email addresses and a telephone number. No postal address appears to be provided. The company is also active on social media platforms. There are reviews provided on the official website but it is not clear whether these are genuine customer reviews.

Whilst the company does sell a range of different product and offers lifestyle advice too, there is no mention of a diet plan available with the products. An ingredients list is available and a nutritional information list too, but the company fails to provide information on the potential side effects of its products and people who should not take the shakes. A selection of multi-pack deals are available, but Protein World does not seem to offer a money-back guarantee.

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Where To Buy Protein World Vegan Slender Blender


Protein World Slender Blender only appears to be available to purchase from the official Protein World website. Though once available on Amazon, it is not currently sold through this channel. The product does not appear to be available to buy from any well-known high street stores (like Boots or Holland and Barratt) or online health shops in the UK. On the Protein World website, the Vegan Slender Blender costs £32 for 1.2kg of powder. This is the only size option, though the powder can be purchased in various flavours (vanilla, chocolate, or ‘naked’, which is unflavoured).

There are options to purchase Vegan Slender Blender as part of multi-pack deals which include a selection of different Protein World products. There does not appear to be a multi-buy discount available.

There is no mention of a money back guarantee with the product. Standard UK delivery from Protein World costs £3.99 (though it is stated on other parts of the website to be £2.99, so this is unclear) or is free for purchases of £80 or more. The delivery is said to take 4-6 working days and there are options for next weekday and Saturday delivery. Delivery to Northern Island costs £6.99. The company does also appear to offer shipping options to the rest of Europe and worldwide.

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Does Protein World Vegan Slender Blender Meet our Approved Criteria

Money-back-guarantee: No, there does not appear to be a 30-day money-back guarantee.

One-off payment: Yes, the payment seems to be one-off via the official product website.

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: Yes, the ingredients list is provided, but the specific quantities of each individual ingredient are not available.

Company contact details readily available: Yes, contact information for the company is available on the official website.

Protein World Vegan Slender Blender does not meet our ‘Approved’ criteria because it fails to provide a moneyback guarantee.

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Overall Verdict

Protein World Vegan Slender Blender is a protein powder product that should be suitable for vegans, vegetarians, and those who are gluten and lactose intolerant. The product is based principally on pea protein, but contains an array of other ingredients, including vitamins, minerals and caffeine. No clinical studies have been performed on the product as a whole and none of the ingredients in the product have been definitively proven to aid weight loss or athletic performance. Caffeine might however be beneficial for endurance athletes. The company sells a range of different health supplements and offers an ingredients list, but no information on side effects and people who should not take the supplement is provided.

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