How to Compare Protein Powder Prices in the UK (Buyer's Guide)

This is a buyer's guide, not the comparison tool itself. If you have ever tried to find the cheapest protein powder in the UK, you know the problem. Every brand has a different bag size, a different serving size, a different protein percentage, and a permanent "sale" that makes it nearly impossible to tell what anything actually costs. Then there are discount codes, cashback offers, and supermarket own-brands thrown into the mix.

In this guide we explain what makes protein comparison so hard, show what real UK buyers on Reddit are saying, and break down the single metric that actually matters when you are choosing a protein powder. If you want the live numbers instead of the explanation, use our compare tool here.

Why comparing protein prices is harder than it should be

The protein powder market in the UK is designed to make comparison shopping difficult. Here is why:

• Inflated RRPs with permanent discounts. Brands like MyProtein and Bulk rarely sell at their listed price. A bag might say it costs 60 pounds, but there is always a 40 to 60 percent discount code available. The "real" price is whatever the current code brings it down to.
• Inconsistent bag sizes. One brand sells in 900g bags, another in 1kg, another in 2.27kg. Comparing a 25 pound bag to a 45 pound bag tells you nothing without normalising the weight.
• Different protein percentages. A cheap bag with 60g protein per 100g is not the same value as a slightly more expensive bag with 82g per 100g. The difference between isolate and concentrate alone can swing this by 10 to 15 percentage points. You are not buying powder, you are buying protein.
• Serving size games. Some brands use a 25g scoop. Others use 35g or even 50g. "30g of protein per serving" means very different things depending on how large the serving is.

What UK buyers actually say

We trawled through dozens of Reddit threads across r/UKFrugal, r/Supplements, r/Fitness, r/GYM, and r/MealPlanYourMacros to understand what real UK protein buyers care about. The same themes came up repeatedly.

MyProtein price frustration

The single loudest complaint is that MyProtein — once the undisputed budget king — has massively increased prices. Users on r/Myprotein describe buying 2.5kg bags for 12 to 15 pounds just a few years ago. Those same bags now sell for 55 to 60 pounds before discount, coming down to 25 to 35 pounds after a code. The consensus: never pay full price, but even the discounted price is no longer the bargain it was.

As one user on r/UKFrugal put it: the quality has gone down at the same time prices have risen. Several threads point to THG (MyProtein's parent company) trying to recover from a 92 percent stock price collapse as the driver behind aggressive price increases. For more context on the broader trend, read our post on why UK whey protein prices are rising in 2026.

The "never pay full price" culture

Experienced UK buyers know that the listed price on most protein brands is a fiction. They wait for sales, stack cashback from TopCashback, and monitor HotUKDeals for flash discounts. Multiple users describe target prices: "I aim for around 10 pounds per kilo" is a common benchmark. Our deals page tracks the latest discount codes so you do not have to hunt for them.

Protein per 100g as a quality check

A frequently upvoted tip across Reddit: always check the protein per 100g on the nutrition label. Users recommend aiming for at least 80g of protein per 100g for whey concentrate. Anything less means filler — thickeners, sweeteners, or cheap carbohydrate bulking agents.

Budget brand recommendations

Beyond MyProtein, the brands Reddit users recommend most are Bulk (consistently cheapest — see our MyProtein vs Bulk head-to-head), The Protein Works (good flavours), Discount Supplements (own-brand value), and Sports Fuel (5kg bags for 30 to 40 pounds on sale). If you are looking beyond MyProtein entirely, we have a dedicated guide to MyProtein alternatives in the UK. For physical stores, Costco, Home Bargains, and even Lidl come up frequently — Lidl's 99p protein drinks have a cult following for on-the-go convenience.

The comparison sites that already exist

Before WheyWise, a handful of sites attempted UK protein price comparison. We reviewed the two most established options to understand what they offer and where they fall short.

ProteinPowder.com

ProteinPowder.com ranks around 30 protein powders in a numbered table. It has extensive editorial content — individual product reviews, a protein calculator, and an ingredient glossary. However, as a price comparison tool it has a fundamental problem: it does not show prices.

The table lists product names and protein types, but no actual pricing data. Users have to click through to Amazon to see what anything costs. The site describes a methodology of dividing price by protein content, but never shows the calculated values. It also skews heavily toward US brands (Rival Nutrition, BPI Sports, Body Fortress) that most UK buyers have never heard of.

If you want product reviews, it is a decent resource. If you want to compare prices, it does not do the job.

DropTime.uk

DropTime is more genuinely useful. Each product card shows the regular price, sale price, and crucially, the price per kilogram. It covers about 27 whey protein products from a mix of UK and European brands including Bulk, MyProtein, Applied Nutrition, and Warrior.

It also shows expandable nutrition data and flags active promo codes — both useful features. The main limitations: no sort or filter controls (you cannot reorder by price-per-kilo), no cost-per-gram-of-protein metric, and the brand selection leans European. It originally launched as a German comparison site, and some of the coverage reflects that origin.

Despite the name suggesting price drop alerts, DropTime does not appear to offer price history or notifications.

How they stack up — feature comparison

Here is a side-by-side look at what each comparison site offers:

The gap is clear. ProteinPowder.com is more of a review site than a comparison tool. DropTime gets closer but lacks the filtering and normalised cost metrics that make comparison shopping practical. Neither tracks more than about 30 products.

The metrics that actually matter

When comparing protein powders, there are really only three numbers you need:

• Cost per 25g of protein. This is the only metric that normalises for bag size, serving size, and protein percentage all at once. A bag of 80 percent whey at 20 pounds per kilo is not the same deal as a bag of 65 percent whey at 18 pounds per kilo — but without this metric, the cheaper bag looks like the better deal.
• Protein per 100g. This tells you the quality of the powder. Higher is better. Below 75g per 100g for whey concentrate and you are paying for filler. We break this down further in cheapest protein per gram UK.
• Price per kilo. Useful as a rough filter, but misleading on its own because it ignores protein content.

Here is how the most popular UK brands compare on cost per 25g of protein:

Bulk and MyProtein (with a discount code) consistently offer the lowest cost per serving — you can see the full breakdown in our MyProtein vs Bulk comparison. Optimum Nutrition and Grenade cost roughly double — you are paying for brand recognition and retail shelf space, not a fundamentally better product. If you are looking for the cheapest Gold Standard specifically, see our cheapest Gold Standard Whey UK guide.

Best value protein powders right now

Based on current WheyWise data, these are the best value whey protein options in the UK:

For live, up-to-date prices across every product we track, check the full comparison table. It updates weekly and sorts by cost per 25g of protein by default.

MyProtein Impact Whey Protein Powder

810g bag

UK's bestselling whey concentrate with 82g protein per 100g. Regularly discounted 40-60% — never pay full price.

Buy Impact Whey Protein Powder →Live price across UK retailersor buy direct from MyProtein →

MyProtein Impact Whey Protein Powder

810g bag

Pros

• + 82g protein per 100g high purity
• + Cheapest per serving during sales
• + Huge 60+ flavour range
• + 5kg bags for long-term savings

Cons

• – Full price is poor value
• – Needs discount code to compete
• – Reformulations change taste occasionally

Pros

• 82g protein per 100g high purity
• Cheapest per serving during sales
• Huge 60+ flavour range
• 5kg bags for long-term savings

Cons

• Full price is poor value
• Needs discount code to compete
• Reformulations change taste occasionally

Buy Impact Whey Protein Powder →Live price across UK retailersor buy direct from MyProtein →

●Nutrition per scoop · 21.6g protein in 30g▼

Protein makes up 72%

of this 30g scoop · 113 kcal total

21.6g

Protein21.6g

Carbs2.7g

Fat1.8g

Other3.9g

Bulk Pure Whey Protein

2.5kg bag

Budget-friendly Informed Sport tested whey from Bulk with 50+ flavours. Consistently among the cheapest per serving in the UK.

Buy Pure Whey Protein →Live price across UK retailersor buy direct from Bulk →

Bulk Pure Whey Protein

2.5kg bag

Pros

• + Among cheapest UK whey options
• + Huge 50+ flavour range
• + 22g protein per 30g scoop
• + Informed Sport batch tested

Cons

• – 70-75% protein purity only
• – Some flavours overly artificial
• – Can cause bloating if lactose-sensitive

Pros

• Among cheapest UK whey options
• Huge 50+ flavour range
• 22g protein per 30g scoop
• Informed Sport batch tested

Cons

• 70-75% protein purity only
• Some flavours overly artificial
• Can cause bloating if lactose-sensitive

Buy Pure Whey Protein →Live price across UK retailersor buy direct from Bulk →

●Nutrition per scoop · 22.7g protein in 32g▼

Protein makes up 71%

of this 32g scoop · 120 kcal total

22.7g

4.8g

Protein22.7g

Carbs4.8g

Fat1.1g

Other3.4g

Optimum Nutrition Gold Standard 100% Whey Protein Powder

900g bag

Optimum Nutrition Gold Standard delivers 24g protein per scoop and holds 4.6 stars across 55,000+ Amazon UK reviews. The default benchmark whey for buyers who want proven consistency over the lowest cost.

Buy Gold Standard 100% Whey Protein Powder →Live price across UK retailersor buy direct from Optimum Nutrition →

Optimum Nutrition Gold Standard 100% Whey Protein Powder

900g bag

Pros

• + 24g protein per scoop blended WPI WPC and hydrolysate
• + Most reviewed whey protein on Amazon UK with 55,000+ ratings
• + Instantised formulation mixes cleanly in cold water
• + 20+ flavour range with Double Rich Chocolate consistently 4.6 stars

Cons

• – Premium price tier above MyProtein and Bulk
• – Contains soy lecithin and artificial sweeteners
• – Smaller 450g tubs poor value vs 900g and 2.27kg sizes

Pros

• 24g protein per scoop blended WPI WPC and hydrolysate
• Most reviewed whey protein on Amazon UK with 55,000+ ratings
• Instantised formulation mixes cleanly in cold water
• 20+ flavour range with Double Rich Chocolate consistently 4.6 stars

Cons

• Premium price tier above MyProtein and Bulk
• Contains soy lecithin and artificial sweeteners
• Smaller 450g tubs poor value vs 900g and 2.27kg sizes

Buy Gold Standard 100% Whey Protein Powder →Live price across UK retailersor buy direct from Optimum Nutrition →

●Nutrition per scoop · 23.7g protein in 30g▼

Protein makes up 79%

of this 30g scoop · 112 kcal total

23.7g

Protein23.7g

Carbs1.6g

Fat1.2g

Other3.5g

Where Reddit users find the best deals

Based on our research across UK fitness and frugal subreddits, here are the strategies real buyers use to save money on protein powder:

• Never pay full price. MyProtein, Bulk, and The Protein Works all use inflated list prices with permanent discount codes. Wait for a 40 to 60 percent sale — they happen multiple times per month. Check our deals page for the latest codes.
• Stack cashback. TopCashback regularly offers 10 to 30 percent back on MyProtein and Bulk orders. Combined with a discount code, this can bring the effective cost below 10 pounds per kilo.
• Monitor HotUKDeals. This is the most commonly recommended deal-tracking resource across every Reddit thread. Users set alerts for protein powder and jump on clearance deals.
• Check supermarkets and discounters. Home Bargains, B&M, and Costco regularly stock protein powder at prices that undercut online retailers. Lidl's protein drinks (99p for 35g protein) are a Reddit cult favourite for convenience.
• Buy close-to-expiry. Sites like NutriCircle and GymStop sell short-dated protein powder at steep discounts. The product is identical — the sell-by date is just closer.
• Buy larger bags. The per-kilo price drops significantly when you go from 1kg to 2.5kg or 5kg. If you know the flavour you like, bulk buying is the simplest way to save. We cover more tactics in the cheapest way to buy protein powder in the UK.

How WheyWise compares prices

We built WheyWise because we were frustrated by the same problems everyone on Reddit complains about. Comparing protein powder should not require a spreadsheet.

Here is what WheyWise does differently:

• 1,958+ products from 85+ UK brands. Not 27. Not 30. We track the actual UK market — every size, every flavour variant, every retailer we can find.
• Cost per 25g of protein. Every product is normalised to the same metric so you can compare a 900g bag of isolate to a 5kg bag of concentrate fairly.
• Sort and filter. Filter by protein type (whey concentrate, whey isolate, vegan, casein, mass gainer), brand, and budget. Sort by cost per serving, price, or protein content. Find what you need in seconds, not hours.
• Weekly updates. Prices are pulled directly from retailer websites every week. What you see is what you will pay.
• No affiliate-first rankings. Products are sorted by value, not by which brand pays the highest commission.

We are not claiming to be perfect. We do not have price history charts yet, and some retailers are harder to track than others. But for the core job — finding the cheapest protein powder in the UK right now — the compare page does what no other site currently offers.