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My Protein Thewhey

Described as an ‘ultra-premium blend’ of whey proteins, this protein supplement is claimed to aid muscle gain and maintenance. There is however no money-back guarantee provided with the product and the company fails to mention any potential side effects.


My Protein Thewhey Pros
  • Made by an established supplement company with safe methods of payment
  • The key ingredient, whey protein, has been shown in some clinical studies to have benefits for muscle gain and maintenance, as advertised
  • The ingredients have not been associated with severe side effects in people of good general health
  • Available in a number of different flavours and two different quantity packs
My Protein Thewhey Cons
  • No clinical studies have been undertaken on the product as a whole
  • While some studies to date have shown whey protein to be beneficial for muscle gain and maintenance, the effect has not been definitively proven and may only be slight
  • Not likely to aid weight loss unless taken alongside regular resistance exercise
  • No money-back guarantee available

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My Protein Thewhey Review

Thewhey is a protein supplement product sold by My Protein that comes in powder form. The powder is to be mixed with liquid and made into a drinkable shake. The product ingredient list is fairly simple; it contains three different types of whey protein, without (as far as we can tell from the ingredients list provided) any additional herbal ingredients.

Unfortunately precise ingredient quantities are not provided and the official product website does not mention any side effects that might be caused by the protein powder. The supplement is available in a range of flavours and the company behind it sells a range of other products and is a well-established retailer.

My Protein Thewhey Claimed weight loss benefits

No claims on the official My Protein Thewhey website directly state that the supplement will contribute to weight loss in any way. Instead, the product is advertised as having the potential to increase muscle gain and improve muscle maintenance. It’s claimed that the ‘unique tri-blend’ of whey ingredients is scientifically proven to help build muscle, but the asterix leads the reader to the statement ‘protein contributes to the growth and maintenance of muscle mass’ (not evidence of the benefits associated with the intake of the three different types of whey specifically). It is implied that the shake should be taken with exercise for best results.

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How My Protein Thewhey Works


My Protein Thewhey is said to work to increase muscle mass and maintenance. It is suggested that the supplement be taken alongside regular workouts to attain these goals. The key ingredient in the product is whey protein (in various forms), which, as we will discuss in the ‘Clinical Studies’ section of this article, has been shown in some trials to be beneficial for muscle gain and recovery when taken with regular resistance exercise. This is because whey protein contains amino acids, which are the building blocks of muscle. It is important to remember however that we do not know how much whey protein is present in the product. It is not claimed to aid fat burning/blocking, metabolism boosting, carbohydrate blocking, or appetite suppression.

How Each Ingredient Works

Whey Protein

On the official My Protein website, whey protein is said to be useful for muscle gain and maintenance. More generally, whey protein has been associated with a number of potential benefits for body composition, potentially targetting three of the five key areas of weight loss.

The ingredient is thought to be useful for muscle gain because it contains a wide selection of amino acids, which are known as the building blocks of protein (and so muscle tissue). When an individual undergoes strenuous exercise, the proteins in the muscle tear and break up. Protein consumed in the diet is therefore used to help to repair these tissues, helping the muscle to grow stronger and to recover more quickly from exercise. Whey protein is known as a fast-acting protein, meaning that it is sent to the muscles fairly quickly following consumption; this is compared to slow-acting protein sources, like casein protein, which may not have such a significant effect on muscle gain.

It has also been suggested that whey protein supplementation can help to increase fat loss. Some believe that consuming additional whey protein might help the body to burn fat stores rather than using other sources of energy, thus helping the user to lose more fat in comparison to muscle, helping them to improve their overall body composition.

Protein supplementation has been said to be beneficial for suppressing the appetite. Protein is a necessary macronutrient and may help to keep the body feeling full for a long period of time, thus preventing snacking and helping users stick to a calorie- or portion-controlled diet. Using protein as the bulk of a meal may help to keep the user full without contributing much in the way of fat and calories.

Finally, supplementing a diet with whey protein might help consumers with their metabolism in the long term. The metabolic rate is the speed at which the body burns energy (attained from fat, carbohydrates etc) to maintain good health; energy is needed for all sorts of bodily functions, from breathing to digestion. Muscle tissue is understood to require more energy when the body is at rest than other tissues, like fat tissue. By increasing the amount of muscle tissue in proportion to fat tissue, the user may therefore heighten their metabolic rate, helping their body to burn more calories. This effect may only be slight, but could be beneficial in the long run.

It is important to remember the way that whey protein works in the body (by supplementing amino acids for the repair of muscle protein); taking extra protein is not generally thought to be beneficial for people looking to lose weight without undergoing regular resistance exercise. If you are trying to lose weight by dieting and not exercising, then taking whey protein supplements is not likely to have a significantly beneficial effect, and may just contribute to your calorie intake.

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Key My Protein Thewhey Ingredients

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The ingredients in this product are listed on the official My Protein Thewhey website, but ingredient quantities are not generally given (though a few are mentioned for some of the individual amino acids in the supplement). The nutritional information (number of calories, fat content, protein content, etc.) is provided in another tab. The only active ingredients in this product appear to be derived from the same source – whey protein. It contains several different types of whey protein – isolate, concentrate and hydrolysate.

Active Ingredients

Whey Protein Isolate

All three of the key ingredients discussed here are types of whey protein. Whey protein is extracted from whey – a by-product of the process of created during cheese manufacturing. It is formed of globular proteins containing a mixture of amino acids. Whey protein isolate is one of the most commonly used whey protein ingredients in protein shake; the ‘isolate’ part of the name refers to the fact that the proteins have been isolated from the fat and lactose, making this ingredient typically high in protein.

Whey Protein Concentrate

Whey protein concentrate is derived from the same source as whey protein isolate. In comparison to the isolated whey ingredient, whey protein concentrate is typically lower in protein percentage. This is because it still contains some of the other whey components, like fat and lactose. Though higher in these components than whey protein isolate, concentrate is still fairly low in fat and cholesterols. This form of whey protein is also very commonly used in the muscle building supplement industry.

Whey Protein Hydrolysate (Lacprodan HYDRO.power)

The final type of whey protein present in My Protein Thewhey is whey protein hydrolysate. This types of whey protein is less commonly found in supplements compared to the other types. Whey protein hydrolysate is called ‘predigested’ protein and is partially hydrolysed (broken down by the addition of water). This is said to make the protein easier to metabolise, potentially making it easier for the body to digest and utilise. This product is claimed to include a selection of enzymes that make the protein even more digestible.

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Clinical Studies

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We could not find any clinical studies performed on My Protein Thewhey as a whole supplement. The official website claims that their ‘tri-blend’ is scientifically proven to help build muscle, but it looks as though My Protein were referring to protein in general, not their specific product formula.

A clinical study is a scientific means of testing the safety and/or effectiveness of a substance or whole product. Usually, the effects of the ingredient of interest will be compared to those of a placebo. Studies are performed under controlled conditions and the results analysed and written up for publication in a scientific journal.

Clinical Studies On Each Ingredient

Clinical Studies on Whey Protein

Whey protein is present in several different forms in the My Protein Thewhey powder; these different forms may be different ‘quality’ whey protein (different proportions of protein and different absorption times), but they are ultimately all derived from the same ingredient. Many studies also do not disclose precisely which type of whey protein was used in their trials, so here we will discuss whey protein as one ingredient, rather than looking at each of the different types individually. Compared to other types of protein commonly added to supplements, like soy protein, casein protein and pea protein, whey protein has been fairly well studied. A selection of studies have been undertaken, mostly in the last decade or two, looking at the potential effects of this ingredient on body composition and recovery from exercise.

One study, published in 2013, compared the effects of whey protein with those of soy protein and carbohydrate (as a control). This study involved a selection of non-resistence-trained male and female subjects (63 in total). The participants were randomly assigned to one of three groups and were given their allocated supplement (containing carbohydrate, whey protein or soy protein) every day for 9 months. The subjects also all followed a resistance training programme, working on the whole body in a supervised environment, consisting of 96 workouts over a nine month period. Body measurements were taken before, during, and after the trial.

The results suggested that taking a whey protein supplement each day could significantly aid lean body mass when compared to taking a soy protein or carbohydrate supplement for the same time period. No differences were reported for fat mass. It was concluded that daily whey protein supplementation could be effective for promoting increases in lean body mass.

Another 2013 study compared the effects of whey protein supplementation with those of rice protein. This trial looked at the effects of the different protein sources on both body composition and recovery from exercise. The study was fairly small, involving just 24 subjects. In contrast to the study mentioned above, the authors of this trial used male subjects who were resistance trained. The subjects were divided randomly to receive one of the two treatments – 48g of rice protein or 48g of whey protein isolate immediately after exercise on their training days. Training days were three days a week, and this continued for a period of eight weeks. Again, measurements were taken throughout the trial, including perceived recovery, soreness, muscle thickness and strength.

This study showed that both whey protein and rice protein supplementation immediately following a resistance exercise session could significantly improve body composition and exercise performance. No significant differences were found in the time to recovery or scores of soreness after exercise. It was concluded that both whey protein and rice protein supplementation could increase lean body mass, muscle mass and strength, and reduce fat mass.

To help draw trends and conclusions for the numerous studies available on whey protein supplementation, some scientists have published review papers, which summarise and analyse all of the data available on the topic at the time of writing. One such review paper was published in 2004 and considered the effects of high protein diets on several aspects of weight loss, including fat burning and appetite suppression. The authors of the trial looked at randomised trials that considered the impact of high protein diets on themogenesis, satiety, body weight and fat loss.

From the papers available, it was noted that there is ‘convincing evidence’ that increasing your dietary protein intake can boost thermogenesis (the internal body temperature – an increase in which has been linked to increased fat burning and a heightened metabolism) and satiety (the feeling of fullness after a meal). The authors found that while some studies did find that increased protein consumption did correlate with increased weight and fat loss, these results are less clear and more study would be required to confirm them.

A meta-analysis was published in the Journal of the American College of Nutrition in 2014. Meta-analyses differ from review papers in that they involve gathering together the data from a number of different studies and conducting statistical analyses on them as one bigger, more reliable dataset. For this paper, the authors found 14 randomly controlled trials looking at the effects of whey protein with or without resistance exercise on body composition. The studies included a total of 626 participants. The results suggested that whey protein supplementation could significantly reduce body weight and body fat and significantly increase lean body mass if taken at the same time as resistance exercise.

Overall, though the results of studies are still a little mixed, the literature to date indicates that whey protein supplementation may be beneficial for improving body composition and increasing lean body mass when taken at the same time as a regular resistance exercise programme.

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My Protein Thewhey Side Effects

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There are no potential side effects listed on the official My Protein Thewhey website, nor any information about groups of people who shouldn’t take the product. Since the product has not been clinically studied as a whole, we cannot be sure of its potential effects on the body. Nevertheless, the product only contains one key active ingredient, so by looking at the side effects of this ingredient we can get a fair idea of any side effects that users might experience when taking the shake. Overall, whey protein is thought to be safe for consumption by most people of good health. It has been associated with some mild side effects, but nothing too severe.

Side Effects Associated With Each Ingredient

Side Effects associated with Whey Protein

For most people, whey protein is thought to be ‘likely safe’ for consumption by mouth when taken in in appropriate doses. High doses of whey protein have been associated with some side effects; these include: headaches, tiredness, thirst, increased bowel movements, nausea, cramps, bloating, and reduced appetite. Whey protein might also cause an allergic reaction in those who are allergic to cows milk. There is not enough clinical information on the effects of whey protein supplementation in pregnant or breastfeeding women to determine its safety here, so to stay on the safe side, it is recommended that these groups of people avoid taking the ingredient.

Whey protein supplementation might also interact with certain medications. It is thought to reduce the amount of levodopa the body absorbs (and therefore reduce the effectiveness of the medicine), so if you are taking levodopa, it’s suggested that you avoid whey protein intake. The ingredient might also reduce the effectiveness of alendronate (Fosamax) and some types of antibiotics; if you have been prescribed antibiotics, seek advice from a healthcare professional before taking whey protein supplements like My Protein Thewhey.

A review study on the safety of high dietary protein intake and resistance exercise made clear that very little is known about the long-term (more than one year) safety of whey protein supplementation. The authors note that while conclusions that too much protein is dangerous are unfounded, so are conclusions that high doses of protein are harmless. Taking high quantities of dietary protein is sometimes said to have a negative effect on the kidneys; the previous study states that there is no evidence from long-term studies to support this statement and a review paper published in 2005 draws the same conclusions (that in healthy individuals, there is no evidence to suggest that taking protein supplements will cause kidney disease or impact renal function).

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How To Use

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The product website offers some information on how to use the supplement. It is stated that one scoop (containing 29g) of My Protein Thewhey powder should be added to water or milk in a protein shaker. Though not stated on the product page, it is usually recommended that the ingredients be shaken together and consumed within 30 minutes of making. If you leave it for any longer, put the shake in the fridge and remember to shake it up again before consuming.

The main Thewhey product page states that you can take Thewhey at any time of day – before a workout, after a workout, or on the go. The authors add that it should be consumed after exercise to get the best results from the shake. The ‘suggested use’ tab provides more detailed information, stating that the shake should be taken 30 minutes before and/or after a workout. Either way, it is indicated that the shake is best suited to those that are undertaking regular exercise.

Due to a lack of clinical information, it is recommended that pregnant and breastfeeding women avoid taking My Protein Thewhey. Whey protein may also interact with some medications – do not take whey protein supplements if you are taking levodopa and consult a doctor before taking if you are taking alendronate or antibiotics.

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Who Makes It

My Protein, the company behind Thewhey, is an established and well-known health supplement retailer in the UK that ships worldwide. The company was created 13 years ago and specialises in protein supplements but sells a whole range of different health products, from snack bars to capsules to clothing. The website is easy to navigate and the payment methods are safe; there is no automatic monthly payment programme.

Their mission is to improve the active lifestyle of people around the world and they have celebrity support, including one of the world’s strongest men (Terry Hollands). It is stated that My Protein products are made in a world-class manufacturing facility, which is supposedly the best in Europe. The facility has been certified AA Grade for Food and Saefty by the British Retail Consortium. There is a whole page on the My Protein website dedicated to their manufacturing facility and equipment.

No postal address appears to be provided for the company, but they do offer a phone number and online form for an email reply. My Protein provides detailed information about their products, but fails to disclose all specific ingredient quantities and does not mention potential side effects or people who shouldn’t use the supplements.

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Where To Buy My Protein Thewhey


My Protein Thewhey only appears to be available to purchase from the official My Protein website. It does not appear to be sold by any well-known high street retailers in the UK or via websites such as Amazon. It may occasionally be available on eBay, but there is no way to guarantee that products sold on this platform are the genuine article.

On the My Protein site, Thewhey is available in several different flavour options: vanilla crème, strawberry milkshake, salted caramel, decedent milk chocolate, and chocolate caramel. It is available to buy in packs of 900g (30 servings) or 1.8kg (60 servings). One 900g tub costs £22.94, supposedly reduced from £26.99, saving the customer £4.05. One 1.8kg tub costs £41.64, supposedly reduced from £48.99, saving the customer £7.35. If you are going to use 60 servings of the product, buying the 1.8kg tub will save you £3.34 when compared to buying two 900g tubs.

The products are ‘usually’ dispatched within 24 hours. Standard delivery costs £2.95 or is free on orders over £50. Numerous other delivery options are available at an extra cost, including next day delivery, Saturday delivery and Sunday delivery. International delivery is also available at varying costs, depending on the country being shipped to.

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Does My Protein Thewhey Meet our Approved Criteria

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

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 and safe via the official My Protein website.

Manufacturing Standard:
The facility is said to have been certified AA Grade for Food and Safety by the British Retail Consortium.

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:
My Protein provide a telephone number and online email form, but no postal address.

My Protein Thewhey does not meet our ‘Approved’ criteria because it fails to provide a moneyback guarantee.

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Overall Verdict

My Protein Thewhey is a protein powder designed to aid muscle gain and maintenance. The powders main component is whey protein, present in three different forms. Whey protein has been shown in some clinical studies to be beneficial for muscle gain and recovery when taken alongside a regular resistance exercise programme. The ingredient is generally thought to be safe, but not enough long-term studies have been performed to be certain. My Protein is an established and reputable supplement store selling a wide range of health supplements, mostly designed to improve body composition. The company provides an ingredients list, but specific ingredient quantities are not disclosed on the website.

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