Quick answer
Soy isolate is usually the cheapest serious vegan protein per gram, while Bulk Vegan Protein is our practical blended value pick. Choose a suitable protein source first, then rank by delivered cost per 1g protein. A cheap single-source powder is poor value when its taste or amino-acid profile makes it hard to use.
Why vegan protein used to be more expensive
Until a few years ago, producing plant protein at the purity and palatability required for a mainstream supplement product required expensive processing. Whey, a byproduct of cheese manufacturing, had a built-in cost advantage as an abundant raw material with decades of processing infrastructure behind it.
Demand for plant-based products has scaled manufacturing rapidly. Pea protein in particular has seen significant investment in processing capacity, which has driven down raw material costs. The gap between whey concentrate and pea protein pricing has narrowed substantially.
Live comparison
Vegan Protein products
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £36.99 27.0g111£0.221 2500183 £20.99 27.0g111£0.253 1000133 £11.99 27.0g111£0.363 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £40.99 25.8g121£0.245 2500183 £22.99 25.8g121£0.277 1000133 £13.99 25.8g121£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £38.99 24.0g102£0.233 30001100 £29.99 24.0g102£0.300 1000133 £13.49 24.2g102£0.409 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £44.99 26.5g112£0.269 30001100 £27.99 26.5g112£0.280 1000133 £13.99 26.5g112£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001132 £47.99 26.0g113£0.364 2000166 £25.99 26.0g113£0.394 1000133 £13.99 26.0g113£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001133 £39.99 21.4g101£0.301 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £59.99 25.0g107£0.359 2500183 £31.99 25.0g107£0.385 1000133 £13.99 25.0g107£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2700190 £30.00 23.0g116£0.333 2880190 £30.00 21.0g118£0.333 900130 £14.99 23.0g116£0.500 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £59.99 24.0g119£0.359 2500183 £31.49 24.0g119£0.379 1000133 £13.99 24.0g119£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001132 £47.99 24.0g122£0.364 2000166 £24.99 24.0g122£0.379 1000133 £13.99 24.0g122£0.424 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £70.99 25.8g114£0.425 30001100 £46.99 25.8g114£0.470 1000133 £17.99 25.8g114£0.545 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2500183 £33.99 24.0g112£0.410 1000133 £14.99 24.0g112£0.454 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £72.99 24.9g118£0.437 30001100 £52.99 24.9g118£0.530 1000133 £17.99 24.9g118£0.545 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001166 £67.49 23.0g106£0.407 2500183 £35.49 23.0g106£0.428 1000133 £14.99 23.0g106£0.454 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001160 £61.49 21.0g91£0.384 2000180 £33.99 21.0g91£0.425 1000140 £18.49 21.0g91£0.462 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001132 £67.99 26.0g108£0.515 2000166 £37.49 26.0g108£0.568 1000133 £20.49 26.0g108£0.621 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £48.99 14.4g104£0.293 30001100 £30.99 14.4g104£0.310 1000133 £14.49 14.4g104£0.439 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £82.99 24.0g103£0.497 2500183 £45.99 24.0g103£0.554 1000133 £20.00 24.0g103£0.606 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000150 £9.80 8.6g60£0.196 500125 £7.75 8.6g60£0.310 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001143 £79.99 24.0g127£0.559 2500171 £42.99 24.0g127£0.605 1000129 £18.99 24.0g127£0.655 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 25018 £4.99 24.0g119£0.624 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40001114 £82.49 28.0g124£0.724 2000157 £45.99 28.0g124£0.807 1000128 £24.79 28.0g124£0.885 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50001167 £102.99 24.2g105£0.617 30001100 £63.99 24.2g105£0.640 2000167 £45.99 24.2g105£0.686 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 840128 £16.00 21.0g118£0.571 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 10001100 £24.99 9.0g39£0.250 250125 £9.99 9.0g39£0.400 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000150 £14.50 10.4g66£0.290 500125 £11.70 10.4g66£0.468 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 10001100 £24.99 8.0g41£0.250 250125 £9.99 8.0g41£0.400 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 270110 £7.50 20.1g110£0.750 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2500183 £77.49 25.0g117£0.934 1000133 £32.49 25.0g117£0.985 5000133 £146.99 25.0g117£4.454 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000167 £55.99 21.0g128£0.836 900130 £29.99 21.0g128£1.000 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000140 £29.99 19.0g93£0.750 500120 £16.99 18.0g93£0.849 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 900129 £28.00 23.0g124£0.966 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000120 £13.99 17.0g174£0.700 500110 £7.99 17.0g174£0.799 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2500142 £49.99 29.0g216£1.190 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 390114 £13.59 23.0g120£0.971 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2267.96176 £86.00 25.0g115£1.132 1133.98138 £53.00 25.0g115£1.395 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 45033 £13.47 96.0g570£4.490 15013 £4.99 96.0g570£1.663 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 980128 £39.99 30.0g127£1.428 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 754126 £25.00 20.0g105£0.962 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1530117 £33.90 40.0g400£1.994 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000166 £69.99 21.0g111£1.060 1000133 £39.99 21.0g111£1.212 500116 £21.99 21.0g111£1.374 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2000266 £83.68 24.0g116£1.268 1000133 £44.99 24.0g116£1.363 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 40015 £6.49 25.0g322£1.298 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 908130 £34.99 21.8g104£1.166 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1800155 £59.99 20.0g119£1.091 800124 £39.99 20.0g119£1.666 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 900130 £33.99 21.0g110£1.133 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 300110 £11.99 22.0g100£1.199 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 684120 £28.00 24.0g132£1.400 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 42016 £8.49 25.0g268£1.415 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 600120 £25.99 21.0g109£1.299 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 16816 £7.99 21.0g105£1.332 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 520113 £27.00 32.0g-£2.077 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000125 £39.99 24.2g143£1.600 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 300115 £10.00 10.0g72£0.667 10015 £4.00 10.0g72£0.800 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 520113 £27.00 30.0g149£2.077 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000112 £17.99 20.0g271£1.499 50016 £9.99 20.0g271£1.665 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1000133 £54.00 21.0g115£1.636 500116 £30.00 21.0g115£1.875 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 520113 £33.00 31.0g148£2.538 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 3301212 £14.99 15.0g80£1.249 33044 £5.99 15.0g80£1.498 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1746147 £93.57 23.1g132£1.991 582147 £31.19 7.7g44£0.664 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 697.4122 £38.00 20.0g120£1.727 719.4122 £38.00 20.0g130£1.727 671122 £38.00 20.0g120£1.727 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1212 £26.00 22.0g-£2.167 77 £16.50 22.0g-£2.357 - £2.50 22.0g-- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1200110 £31.99 32.0g523£3.199 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 520113 £27.00 20.0g133£2.077 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 317110 £23.00 20.0g120£2.300 327110 £23.00 20.0g130£2.300 305110 £23.00 20.0g120£2.300 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 50011 £6.95 60.0g439£6.950 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 600120 £52.00 22.0g110£2.600 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 235124 £14.95 5.0g35£0.623 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 352.8112 £31.00 20.0g110£2.583 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 300130 £33.00 7.4g38£1.100 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 54033 £6.75 3.6g290£2.250 18013 £2.39 3.6g290£0.797 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 300033 £65.97 --£21.990 10001- £21.99 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1191130 £49.99 -150£1.666 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1047130 £49.99 -150£1.666 |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 10001- £13.99 --- 5001- £8.99 --- 2501- £5.99 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1751- £9.00 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 2501- £15.00 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving - £70.00 --- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 1701- £9.95 4.0g-- |
FlavourSize (g)Size (ml)QtyServingsOfferTotal Per serving 30 £19.95 0.0g16£0.665 |
How to compare vegan protein by true value
Cost per gram of protein is the only fair comparison metric. Tub price varies with pack size, and protein percentage varies between products. A product with 65g protein per 100g is delivering less protein per pound spent than one with 80g per 100g at the same price.
To calculate: take the tub price, divide by the total protein content of the tub in grams. A 1kg tub at 75% protein gives 750g of protein. At GBP 20, that is 2.67p per gram of protein. This number is what you compare across products.
What typically wins on value
Larger packs almost always give a better cost per gram. A 2.5kg or 5kg bag from a major brand during a promotional period is usually the cheapest way to buy vegan protein in the UK.
Single-ingredient pea protein powder, unflavoured, is generally the cheapest format by cost per gram of protein. Blended products with additional ingredients, premium flavouring or added vitamins cost more. Decide whether those additions are worth the premium to you before buying.
Community perspective
What others are saying
If price is ruling out protein powders, and you want to keep calories low, you are stuck with meat. Chicken is still the cheapest. Pork is also usually inexpensive.
u/shiplesp in r/Frugal
from what I've read, a mix of pea and rice protein best mimic whey protein, something with acids yadayada, from what I've tried, rice protein is disgusting and pea protein is bareable at best (at least pulsin' brand) Soy protein is pretty much undetectable in smoothies and food tho, and its the cheapest variety most of th time
u/[deleted] in r/veganfitness
I use the vegan protein on amazon. It’s cheap and tastes good, I think it’s made up of a blend of peas and other plants
u/gaelgal in r/veganfitness
Watch what buyers found
Hands-on opinions
CHEAPEST Protein Powders (That Are Still High Quality)
FeastGood
A topic-specific video selected for additional practical context on Cheapest Vegan Protein UK: Real Prices and the Best-Value Options.
Brands worth comparing in the UK
The major volume suppliers of vegan protein in the UK, Bulk, Myprotein, and similar direct-to-consumer brands, regularly discount large bags. These promotional prices are often the cheapest available, sometimes beating budget own-brand alternatives on a per-gram basis.
Discount varies week to week. The best approach is to compare live prices using a price comparison tool rather than relying on a single snapshot. The ranking changes with each sale cycle.
Cheapest Vegan Protein
Soy Protein Isolate Powder – 90% Protein
Pure Source Nutrition · 500g
Pros
- Soy is a complete dairy-free protein containing all nine essential amino acids
- 39.7% below the £2.65/100g average across 64 comparable /compare listings
What to sacrifice and what not to
It is reasonable to sacrifice brand recognition, flavour variety, and premium packaging in pursuit of lower cost. These do not affect the protein's function.
It is not reasonable to sacrifice protein percentage below around 65g per 100g, amino acid completeness, prefer blends over single-source where needed, or basic third-party testing. A cheap product that is poorly formulated delivers less value per gram than a slightly more expensive well-formulated one.
References
Sources and further reading
- 01Competition and Markets Authority — price-reduction claims
UK guidance relevant to reference prices, discount claims and online urgency messaging.
Frequently asked questions
Is cheap vegan protein as good as expensive vegan protein?+
If the protein percentage is comparable and the amino acid profile is complete, usually a pea and rice blend or soy, a cheaper product performs identically for muscle building purposes. Price differences above this baseline are for flavour, brand or convenience.
Is unflavoured vegan protein worth buying?+
If you plan to blend it into smoothies, porridge or cooking, yes. Unflavoured is cheaper and more versatile. If you need to mix it with water alone, flavoured versions are considerably more palatable.
How does vegan protein compare to whey on price in the UK?+
The gap has closed significantly. Budget vegan protein now sits in a similar price range to mid-tier whey concentrate. Premium vegan blends remain more expensive than budget whey, but the cheapest vegan options are now comparable on cost per gram of protein.