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Warrior Whey is the brand’s everyday protein powder, and the 500g bag is its “try it first” size. On Amazon UK it was £19.99 when I checked, with 4.3 stars from 1,337 ratings, and the listing leads with up to 36g of protein per serving. That number made me read the small print, because 36g is a lot more than most whey powders claim for a scoop.
The short version
The 36g figure is for a 50g serving. Warrior’s own numbers work out at about 72% protein, so a normal 30g scoop gives roughly 21 to 22g, which is ordinary for a flavoured whey. The 500g bag is an expensive way to buy it at about £40 per kg, and Warrior’s own site was £2 cheaper than Amazon. Owners mostly rate the quality and mixing, but they’re split on taste: too sweet for some, bland for others. It’s a reasonable way to try a flavour and a poor way to buy protein long term.
What’s in a serving
| Protein | Up to 36g per 50g serving (about 72% by weight); roughly 21 to 22g in a 30g scoop |
| Sugar | Under 1.5g per scoop |
| Calories | Warrior gives a range of about 80 to 160 kcal, depending on serving and flavour |
| Protein source | A blend of whey concentrate and isolate from European grass-fed whey |
| Free from | Gluten, soy and aspartame, according to Warrior |
| Made in | UK, in GMP-certified facilities |
| Flavours (500g) | Double Chocolate, Chocolate Brownie, White Chocolate, Salted Caramel, Vanilla Ice Cream, Vanilla Milkshake, Strawberry Creme, Strawberry Milkshake, Coconut |
The nutrition section on Warrior’s page mixes two serving sizes: the heading says per 30g scoop, while the 36g of protein is quoted per 50g. Check the panel for your flavour on the bag, since Warrior says the figures vary slightly between flavours. If you’re comparing powders, protein per 100g is the fairer number, and here it’s about 72g. My guide to whey concentrate vs isolate explains why isolates sit higher.
What owners say
Amazon’s summary of the reviews (October 2026) counts 81 positive mentions of quality out of 98, and owners say it mixes easily in water or milk. Taste is the most discussed point, with 145 mentions, and opinion is split: some find it pleasantly mild, others say it’s far too sweet, and one reviewer called it bland next to other powders. Value gets 36 positive and 13 negative mentions. Digestion and clumping are mixed, with some owners reporting no problems and others finding it lumpy or not agreeing with them.
The cons
- The 36g headline is for 50g of powder. Per 30g scoop you get about 21 to 22g of protein.
- The 500g bag costs about £40 per kg on Amazon, against £29 to £31 per kg for several popular wheys in bigger bags.
- Amazon was £19.99 and Warrior’s own site £17.99 for the same 500g bag when I checked. The 1kg bag on Warrior’s site was out of stock in every flavour.
- Taste divides people, so pick a flavour carefully. That’s the one thing the 500g size is good for.
- Warrior gives a wide calorie range rather than an exact figure for each flavour on the product page.
How to use it
One 30g scoop in 200 to 300ml of water or milk after training, or whenever you’re short on protein for the day. Water keeps the calories down; milk adds about 8 to 9g of protein per 250ml and makes it creamier. If you’re not sure how much protein you need, start with how much protein per day, because the daily total matters more than when you have the shake.
Price per kg vs other whey (Amazon UK, 21 Oct 2026)
| Product | Size | Price | Per kg | Amazon rating |
|---|---|---|---|---|
| Warrior Whey | 500g | £19.99 | £39.98 | 4.3 (1,337) |
| Warrior Whey (2kg bag) | 2kg | £74.49 | £37.25 | 4.3 (925) |
| Protein Works Whey Protein 360 | 1.2kg | £35.76 | £29.80 | 4.1 (716) |
| USN BlueLab Whey | 2kg | £58.88 | £29.44 | 4.8 (305) |
| Bulk Pure Whey | 2.5kg | £77.99 | £31.20 | 4.4 (4,657) |
Prices are approximate and change daily; the live price is the one on Amazon. Our whey protein price table compares 22 wheys and is re-checked regularly, and my cheap protein powder guide goes through the budget options.
At about 72% protein, the 500g bag works out at roughly £5.55 per 100g of protein on Amazon. Even Warrior’s 2kg bag is barely cheaper per kg, so if you like Warrior, the 1kg bag on Warrior’s own site at £29.99 is the one to wait for.
Check Warrior Whey 500g on Amazon UK
Who should buy it
- Anyone who wants to try a Warrior flavour before committing to a big bag.
- People who want a small bag for travel or a gym locker.
- Fans of sweet, dessert-style flavours.
Who should NOT buy it
- Anyone buying protein on price. Most popular wheys in 2kg or 2.5kg bags cost far less per kg.
- People who want 25g of protein or more in a 30g scoop. An isolate is the better fit.
- Anyone who dislikes very sweet shakes, since that’s the most common complaint.
FAQ
How much protein is in Warrior Whey?
Warrior quotes up to 36g per 50g serving, which is about 72% protein. A 30g scoop gives roughly 21 to 22g.
Is Warrior Whey gluten-free?
Warrior says it’s gluten-free, soy-free and aspartame-free. It’s a dairy product, so it isn’t suitable for a milk allergy.
Is it cheaper on Amazon or on Warrior’s site?
When I checked on 21 October 2026, the 500g bag was £17.99 on Warrior’s site and £19.99 on Amazon UK.
Is Warrior Whey a concentrate or an isolate?
Warrior describes it as a blend of whey concentrate and isolate.
How many shakes are in the 500g bag?
About 16 at a 30g scoop, or 10 at the 50g serving the headline figure is based on.
Verdict
Warrior Whey looks like a decent, well-mixing whey that owners mostly rate for quality, with a taste you’ll either like or find too sweet. The 500g bag is poor value per kg, and the 36g protein headline needs its small print. On paper I’d rate it 6/10 in this size, and I’ll update that once I’ve used a bag myself.