Quick answer
MyProtein Impact Whey is our best overall UK protein powder when its live cost per 1g protein is within 10% of Bulk Pure Whey. It wins on flavour choice and pack flexibility. Bulk becomes our pick when it is more than 10% cheaper; Optimum Nutrition Gold Standard is the premium taste choice, not the value winner. Most buyers should start with whey concentrate. Pay for isolate only when lower lactose or tighter macros solve a real problem, and choose a pea-and-rice blend or soy isolate when avoiding dairy. The live table below matters more than any fixed sale price printed in this article.
Best overall value: MyProtein Impact Whey
MyProtein Impact Whey consistently lands as the cheapest per 100g, largely because it is on sale most of the time. On offer it typically runs £1.40 to £1.60 per 100g, which is hard to beat. Protein content sits around 82g per 100g, so each serving delivers a strong dose of essential amino acids for muscle repair after training. Dozens of flavours make it easy to keep a post workout shake interesting rather than a chore.
The catch is that the listed price is often inflated so the constant discount looks bigger than it is. Ignore the percentage off and judge by the per 100g price instead, since that is the only figure that reflects what you actually pay.
Live comparison
Whey Protein products
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 3000177 £38.99 29.6g148£0.506 2000151 £28.99 29.6g148£0.568 1000126 £16.99 29.6g148£0.653 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £14.99 24.3g114£0.454 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 48001160 £85.49 20.0g111£0.534 2400180 £44.49 20.0g111£0.556 1200140 £23.99 20.0g111£0.600 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 48001160 £77.49 18.0g110£0.484 2400180 £39.99 18.0g110£0.500 1200140 £21.19 18.0g110£0.530 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 48001136 £95.99 24.0g127£0.706 2400168 £49.99 24.0g127£0.735 1200134 £26.99 24.0g127£0.794 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2340190 £54.49 20.0g100£0.605 36001150 £90.49 20.0g93£0.603 2160190 £54.49 20.0g93£0.605 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 930130 £22.49 23.0g115£0.750 43501150 £99.99 20.0g108£0.667 36001120 £79.99 20.0g109£0.667 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2250190 £55.99 17.0g109£0.622 750130 £19.99 17.0g109£0.666 375115 £11.49 18.0g110£0.766 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 720124 £17.99 21.0g112£0.750 2000166 £69.99 21.0g110£1.060 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001156 £129.99 23.0g121£0.833 2500178 £67.99 23.0g121£0.872 1000131 £27.99 23.0g121£0.903 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000161 £60.00 27.0g137£0.984 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £139.99 22.0g113£0.838 2500183 £74.99 22.0g113£0.903 1000133 £31.99 22.0g113£0.969 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2100170 £59.95 22.5g113£0.856 510117 £29.95 22.5g113£1.762 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800172 £54.95 20.0g101£0.763 1000140 £32.95 20.0g101£0.824 450118 £19.95 20.0g101£1.108 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 5000183 £107.99 33.0g203£1.301 2500141 £59.99 32.0g209£1.463 1000116 £27.49 35.0g214£1.718 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £149.99 23.1g110£0.898 2000167 £62.99 23.1g110£0.940 1000133 £32.99 23.1g110£1.000 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £159.99 23.7g119£0.958 30001100 £99.99 23.7g119£1.000 2000167 £69.99 23.7g119£1.045 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 650124 £18.00 18.0g98£0.750 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001133 £122.99 22.0g113£0.925 2000166 £63.49 22.0g113£0.962 1000133 £33.99 22.0g113£1.030 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2270176 £79.99 24.0g113£1.052 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000140 £32.99 22.0g113£0.825 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000166 £59.99 20.0g114£0.909 900130 £39.99 20.0g114£1.333 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2200173 £79.99 24.0g-£1.096 900130 £41.99 24.0g-£1.400 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000162 £59.99 20.0g125£0.968 1000131 £34.99 20.0g125£1.129 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 420114 £15.19 23.4g113£1.085 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000161 £68.95 24.0g130£1.130 825125 £33.95 24.0g130£1.358 450114 £19.95 24.0g130£1.425 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2500183 £91.99 23.0g110£1.108 1000133 £39.99 23.0g110£1.212 500117 £23.49 23.0g110£1.382 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000130 £36.99 25.0g132£1.233 500115 £25.99 25.0g132£1.733 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000157 £75.00 27.0g136£1.316 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £37.99 23.0g117£1.151 300110 £21.99 23.0g116£2.199 3011 £2.49 23.0g116£2.490 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 45301146 £170.00 24.0g116£1.164 2260173 £98.00 24.0g116£1.342 899129 £50.00 24.0g116£1.724 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800172 £75.00 21.0g-£1.042 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 500120 £17.99 17.8g97£0.899 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2270161 £68.00 22.0g150£1.115 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2250166 £69.99 21.4g108£1.060 908127 £39.99 21.4g108£1.481 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 900130 £32.00 21.0g109£1.067 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2267.96174 £96.00 25.0g120£1.297 1133.98137 £58.00 25.0g120£1.568 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000166 £71.99 20.0g108£1.091 1000133 £39.99 20.0g108£1.212 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2270170 £91.00 24.0g120£1.300 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 899129 £34.99 22.0g120£1.207 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000140 £37.99 17.0g90£0.950 500120 £19.99 17.0g90£0.999 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800260 £80.98 24.0g115£1.350 900130 £40.49 23.0g113£1.350 3011 £2.49 23.0g113£2.490 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1020130 £41.49 25.0g128£1.383 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800160 £69.99 20.0g112£1.166 1200140 £47.49 20.0g112£1.187 600120 £24.99 20.0g112£1.249 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2250175 £119.99 27.3g110£1.600 750125 £49.99 27.3g110£2.000 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 900130 £43.99 25.0g-£1.466 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000167 £89.99 22.0g117£1.343 1000133 £49.99 23.0g122£1.515 300110 £21.99 22.0g117£2.199 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800160 £79.99 22.0g115£1.333 810127 £49.99 22.0g115£1.851 450115 £29.99 22.0g115£1.999 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 48001192 £224.00 19.6g99£1.167 2400196 £120.00 19.6g99£1.250 1200148 £62.00 19.6g99£1.292 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000266 £89.98 23.0g113£1.363 1000133 £49.99 23.0g113£1.515 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 640120 £25.00 20.0g120£1.250 620120 £25.00 20.0g115£1.250 600120 £25.00 20.0g111£1.250 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £48.95 22.0g115£1.483 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £48.95 22.0g115£1.483 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000130 £36.99 19.3g128£1.233 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000165 £110.00 25.0g130£1.692 1000132 £58.00 25.0g130£1.813 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000129 £54.99 23.0g129£1.896 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £54.00 20.0g107£1.636 500116 £30.00 20.0g107£1.875 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 300110 £19.99 22.0g100£1.999 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1001212 £25.00 20.0g81£2.083 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 3111 £4.39 24.0g116£4.390 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 192124 £8.99 2.0g40£0.375 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 20001- £77.50 24.0g-- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 9001- £28.00 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 20001- £67.50 24.0g-- 9081- £36.00 24.0g-- 4761- £18.00 24.0g-- |
Best overall Whey Protein
Diet Whey Protein Powder
Pure Source Nutrition · 1kg
Pros
- Whey concentrate supplies a complete essential-amino-acid profile
- 51.2% below the £3.48/100g average across 60 comparable /compare listings
Cons
- Whey concentrate may not suit lactose-sensitive users
Best runner-up: Bulk Pure Whey Protein
Bulk is MyProtein's closest rival on price, with Pure Whey Protein sitting around £1.50 per 100g and comparable quality. It uses the same type of grass-fed whey concentrate, so the amino acid profile is similar. Some buyers prefer Bulk's flavours, particularly the vanilla, which tastes less artificial than MyProtein's version.
Bulk also runs frequent sales and stocks sizes from 500g up to 5kg, so it scales well whether you are trying it out or committing to a bigger bag. For anyone building muscle on a budget, Bulk is one of the more reliable ways to keep protein intake high without overspending.
Best isolate: MyProtein Impact Whey Isolate
If you are lactose intolerant or want a cleaner macro profile, whey isolate is worth the extra cost. MyProtein's isolate runs around £2.50 to £3.00 per 100g, roughly double the concentrate, but protein content is higher at around 90g per 100g and it carries less fat and carbohydrate. The higher amino acid concentration and faster absorption make it a popular post workout choice for people training intensely. Compare all whey isolate prices to find the cheapest option right now.
Community perspective
What others are saying
Seems like a lot of effort to turn that into a vanilla flavoured protein powder?
u/EndPsychological2541 in r/AskUK
Second this, they recently had the ‘360’ version of their whey protein Vanilla Crème and it’s the best I’ve had. Optimum Nutrition is good but a little pricey. Worth it though. I can’t drink my protein anymore, really bad quality these days.
u/discoveredunknown in r/AskUK
Watch what buyers found
Hands-on opinions
I Compared MyProtein's Impact Whey to Every Top Selling Protein in the UK
Tom Newsham Fitness
A hands-on UK comparison to accompany the live ranking.
Best budget pick: Protein Works Whey Concentrate 80
Protein Works often gets overlooked, but its whey concentrate regularly comes in under £1.60 per 100g once a sale and discount code stack together. The flavour range is decent and quality holds steady tub to tub.
How to actually compare
Compare price per 100g, not total price. A 2.5kg bag looks expensive next to a 1kg bag, but it is almost always cheaper per gram once you do the maths. Use the protein powder price comparison to see current prices across all retailers sorted by per 100g cost, and browse by type, whether that is whey concentrate, whey isolate, or vegan protein.
Factor in active discount codes too, since a 25% off code can turn a seemingly expensive retailer into the cheapest option overnight. Check the protein powder discount codes for today's offers, or read MyProtein vs Bulk: which is cheaper? for a direct comparison.
How to choose the right protein powder
With so many options available, picking the right protein powder comes down to a few practical questions. Start with your goal. For muscle building after intense training, a whey protein powder with a complete amino acid profile, rich in leucine, is the most effective choice. On a plant-based diet, vegan blends made from pea, rice, or hemp still deliver useful plant protein, though the amino acid profile is usually less complete per serving than whey.
Next, think about when you will actually use it. A shake mixed with water is the simplest post workout option, but protein powder blends just as well into porridge, smoothies, or baking. That versatility makes it easier to hit a daily protein target as part of a balanced diet, particularly if whole foods alone do not get you there. UK government guidelines suggest most adults need around 0.75g of protein per kilogram of bodyweight, but anyone doing regular resistance training will likely benefit from a higher intake, typically 1.6 to 2.2g per kilogram, to support muscle repair and growth.
Do not overthink the final choice. The gap between a good whey concentrate and a premium isolate matters less than consistency. Pick something you can afford every month, that you actually enjoy drinking, and that fits your macros. Any reputable brand on this list will support your goals: the best protein powder is the one you will keep using. If you are unsure where to start, use the comparison tool to sort by price and find the cheapest match for your needs.
References
Sources and further reading
- 01Morton et al. — protein supplementation and resistance training
Evidence used to prioritise adequate total protein over premium branding.
- 02MyProtein — Impact Whey Protein
Official information for the overall pick.