Myprotein Impact Whey Protein review

Our take: this is the price everything else has to beat

Most whey reviews start with the product. This one is more useful the other way round, because Impact Whey is less a product to be persuaded about than a number to measure other products against. If a tub costs meaningfully more per gram of protein than this one, the rest of the review is about whether the difference is worth it.

On the brand’s own UK page on 22 September 2026, the 900 g pack of 30 servings was £32.99, reduced from £34.99, which Myprotein itself states as £1.10 per serving. The Original version delivers 22 g of protein in a 30 g scoop, which works out at roughly £5.00 per 100 g of protein. That is the figure to carry around the rest of the category.

The formula is honest and plain: whey protein concentrate at 96 per cent of the mix, emulsifiers, flavouring, sweetener. Nothing exotic, nothing hidden behind a proprietary blend. What you are buying at this price is protein and a flavour, and the label does not pretend otherwise.

Two things stop this scoring higher. The front of the page advertises “up to 23 g of protein”, which is the best case across a range of more than forty flavours rather than what any particular tub contains — the vanilla we priced gives 22 g. And the page we could read published the protein figure and the protein percentage but not a full nutrition panel, so fat, carbohydrate, sugars and salt per serving are not in front of a shopper making the decision. That is a smaller sin than hiding a dose, but it is a gap.

This is a desk review of published label information and independent research. Nobody here has tasted this powder or measured its contents, and no flavour, texture or mixability claim on this page should be read as a test result.

What exactly are you buying?

The listing this page is built on is the 900 g pack, sold as 30 servings, in vanilla. Thirty servings out of 900 g means a 30 g scoop. Myprotein sells the same name in several pack sizes and several formats, so match what you are ordering: Impact Whey Isolate is a different, more filtered product advertised at 26 g per scoop, and the Milkshake and +Collagen versions are different formulas again.

The vanilla ingredient list is three items plus the protein base: Whey Protein Concentrate (Milk) at 96 per cent, containing the emulsifiers soya lecithin and sunflower lecithin, then flavouring and the sweetener sucralose. The product is marked suitable for vegetarians. Allergens are milk and soya, declared in bold as GB labelling requires.

Concentrate rather than isolate is the defining fact about this powder, and it explains most of the price difference against premium whey. Concentrate is filtered less, so it carries more of the fat, carbohydrate and lactose that came with the milk. Myprotein’s own figures put the Original version at 73 per cent protein by weight and 114 kcal per serving — against, for example, the roughly 80 per cent of an isolate-led blend. You are not getting a worse protein; you are getting a less concentrated one, and paying less for it.

The brand publishes its own range comparison, which is more candid than most: Original at 22 g of protein and 73 per cent, Milkshake at 20 g and 69 per cent, +Collagen at 20 g and 80 per cent. Read that table before choosing a format, because the differences are real and the front-of-page figure does not carry them.

What the protein evidence actually supports

The claim is well founded, and it is a claim about your diet

A 2018 systematic review and meta-analysis in the British Journal of Sports Medicine pooled 49 studies and 1,863 participants and found that protein supplementation meaningfully increased gains in muscle size and strength during prolonged resistance training. That is a solid body of evidence by supplement standards.

The part worth holding on to is what the same analysis found about dose and source. Benefit plateaued at roughly 1.6 g of protein per kilogram of body weight per day, and total daily protein mattered more than the timing of a shake or which protein it came from. That is good news for a budget product: the research gives no reason to think a more expensive whey does the job better at equal protein.

Whether you need it at all is the prior question

The British Nutrition Foundation puts the UK Reference Nutrient Intake at 0.75 g per kilogram of body weight per day — about 56 g for men and 45 g for women at reference weights — and records average UK intakes of 76.0 g a day for adults aged 19 to 64. It states plainly that most people here do not need extra protein from supplements.

The exception is the person this product is aimed at. The same source cites American College of Sports Medicine figures of 1.2 to 2.0 g per kilogram per day for people training hard. At 80 kg that is 96 to 160 g a day, and reaching the upper half of it from food alone takes planning. A 22 g scoop at £1.10 is a cheap, unglamorous way to close that gap — which is the whole case for this tub.

What a GB label is permitted to claim

Under the Great Britain nutrition and health claims register, the authorised protein claims are narrow: protein contributes to the growth and maintenance of muscle mass, and to the maintenance of normal bones. Anything past that wording is marketing rather than an approved claim, and the ASA’s guidance on sports supplements governs how it may be advertised.

Informed Protein: a certification worth understanding properly

Myprotein’s product page describes the range as “quality tested” and “certified by world leading labs” without naming a certifier, which on its own is the kind of phrase this site treats as marketing. There is, however, something concrete behind it.

In a July 2025 announcement from its parent company, Myprotein said Impact Whey Protein and Impact Whey Isolate had become the first of its products certified under Informed Protein, an independent programme run by the testing authority LGC. The announcement describes that certification as verifying true protein content free from amino acid spiking and fillers, product purity against contaminants and undeclared ingredients, and manufacturing standards.

That is a meaningful thing to hold in a category with a documented label-accuracy problem — the same announcement cites research finding only 27 per cent of protein powders contained their stated protein amount. If your worry is that a cheap whey is padded with free amino acids to inflate its protein number, this is the certification that addresses it directly.

What it is not is a banned-substance certification. Informed Protein and Informed Sport are different programmes with different purposes, even though LGC runs both. Informed Sport is the one that batch-tests for substances on the WADA list, and it is the one a drug-tested athlete needs. We have not verified a current Informed Sport batch listing for this product, so if you compete, check the certifier’s database for your specific batch rather than reading one certification as if it were the other. Our Kinetica Whey Protein review covers a product that makes the banned-substance claim explicitly.

Price: the arithmetic, and the trap in it

£32.99 divided by 30 servings is £1.10 a serving, which the brand states itself. Divide that by the 22 g of protein in a scoop and multiply by 100 and you get about £5.00 per 100 g of protein. Use that second figure, not the first, whenever you compare tubs: cost per serving flatters any product with a small scoop.

The trap is the flavour. If you choose a format delivering 20 g rather than 22 g at the same price, your cost per 100 g of protein rises to about £5.50 without the shelf price moving at all. Over a year of daily use that is a real amount of money for a difference the front of the page rounds away. Read the panel for the specific flavour and format, then do the division.

Larger packs generally reduce the per-serving figure, so the honest question is whether you will get through one. Whey has a finite shelf life once opened and flavour fatigue is real; a 900 g tub you finish beats a 2.5 kg sack you abandon. The pack size that is cheapest per gram is only cheapest if it is consumed.

For context on what a premium buys, our Optimum Nutrition Gold Standard review looks at the best-known whey in the UK against the same arithmetic, and finds no evidence that it produces a different result at equal protein.

Side effects, allergens and who should skip it

Contains milk and soya, both declared in bold. Anyone with a cow’s milk protein allergy should not use it. Anyone who is lactose intolerant should be more careful here than with an isolate-led product: concentrate retains more lactose, and at 96 per cent of the formula there is nothing else in the tub doing the work. Bloating, wind or loose stools in the first week are the signal to stop, and a large pack is a poor way to run that experiment.

For a healthy adult adding a scoop to an ordinary diet, whey is a food and the risk profile is close to drinking milk. Anyone with reduced kidney function, anyone on a protein-restricted diet for a medical reason, and anyone pregnant or breastfeeding should take the label to a GP, pharmacist or dietitian rather than reasoning from a product page. Children do not need protein supplements.

One regulatory point for UK readers: food supplements and sports nutrition products sold in Great Britain are not assessed and approved by a regulator for safety or effectiveness before sale. Responsibility for the accuracy of the label sits with the business selling it, which is exactly why a third-party protein-content certification is worth something.

Sources and shopping: what to check before you order

Before ordering, fix four things: the pack size, the specific flavour and format, the protein per serving on that variant’s own panel, and the delivered price including any shipping threshold. Then convert to cost per 100 g of protein. If a discount code or a multi-buy changes the price, redo the division — the ranking between products moves more often than people expect.

If banned-substance testing matters to you, do not treat the Informed Protein certification described above as covering it, and look the batch up in the appropriate certifier’s database. If it does not matter to you, this is a plain, well-priced, adequately documented whey, and the case against it is mostly that the front of the page is more generous with its protein figure than any individual tub is.

We have not published a commercial link for this product. Nothing on this page is affected either way: the score reflects the label, the price and the evidence, and the price is the reason it scores as well as it does.