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# UK Protein Powder Buying Guide

Protein powder prices in the UK can look very different even when two tubs contain a similar amount of protein. This guide shows how to compare GBP prices without mixing up flavours, package sizes, retailer variants, or checkout costs.

## The short version

- Start with the exact flavour and package size.
- Compare the displayed £ price on the same variant.
- Convert the price to cost per 100g of actual protein.
- Check delivery, returns, ingredients, allergens, and the final basket total.

## What makes the UK comparison different?

SupplementMath's UK market uses GBP prices and UK retailer domains: Amazon.co.uk and uk.iHerb.com. A product only receives a UK price when the observed page matches the catalog product's identity, flavour, and package size closely enough to audit.

That matters because a search result can combine several sizes or flavours. A cheap 1 kg vanilla listing is not evidence for a 2 lb chocolate listing, even when the product name is similar.

## Step 1: Match the exact product before comparing £ prices

Check these fields on the retailer page and the product record:

- Brand and product: the formulation must be the same product line.
- Flavour: chocolate, vanilla, unflavoured, and limited editions can have different prices.
- Package size: compare 907g, 1kg, 2.26kg, and other sizes separately.
- Retailer product ID: ASINs and iHerb IDs help distinguish similar listings.

Pounds and kilograms are useful for understanding pack size, but they do not make two listings an exact match. Use the product's labelled nutrition data for the value calculation below.

## Step 2: Compare price per 100g of actual protein

Container price is only a starting point. The more useful comparison is the cost of 100g of protein:

Price per 100g protein = \(Container price ÷ total protein grams\) × 100

Example: £40 ÷ \(25g × 30 servings\) × 100 = £5.33 per 100g protein

This calculation makes a large tub comparable with a smaller tub and exposes differences in protein concentration. It also prevents a large serving count from making a product look cheaper than it is. For a full worked example, read [how to compare protein powder prices](https://www.supplementmath.com/protein-powder/learn/how-to-compare-protein-powder-prices/index.md).

## Amazon.co.uk vs iHerb UK

Compare the same variant on both retailer domains where both sources have a verified listing. Keep the comparison honest by recording the displayed product price and the observation date, then check:

- whether the listing is sold by the retailer or a marketplace seller;
- whether the item is in stock and deliverable to your address;
- delivery charges, minimum-order thresholds, and estimated arrival dates;
- return conditions and whether the final basket price differs from the product-page price.

SupplementMath does not pretend that a product-page price is a complete delivered-cost quote. Our UK observations exclude delivery, coupons, subscriptions, bundles, and member-only prices. Use the displayed price for a first comparison, then confirm the checkout total.

## Read the UK label, not just the front of the tub

Before buying, check the nutrition declaration, ingredients list, serving size, and allergen information. The Food Standards Agency's guidance on [food supplements](https://www.food.gov.uk/business-guidance/food-supplements) explains the UK business requirements, while its [allergen guidance](https://www.food.gov.uk/business-guidance/allergen-guidance-for-food-businesses) covers how allergen information is handled for food businesses.

- Confirm protein grams per serving and servings per container.
- Check milk, soya, egg, and other relevant allergens in the ingredients information.
- Check sweeteners and flavouring if you are avoiding a specific ingredient.
- Do not treat a certification logo or a marketing claim as a substitute for reading the label.

## What a missing UK price means

A blank UK price is deliberate. It means the collection did not retain a credible exact-match price for that source. Pages with a 404, bot challenge, hidden or ambiguous price, or an unsupported variant are recorded as unsuccessful rather than filled with a guess. This keeps the UK table useful for comparison instead of making its coverage look better than the evidence supports.

## Compare the UK catalogue

Browse the available UK products and sort them by price per 100g of protein.

 [Compare UK protein powders →](https://www.supplementmath.com/protein-powder/uk/index.md)

## Frequently asked questions

### Which retailers does the UK comparison use?

The UK market comparison uses displayed product prices from Amazon.co.uk and iHerb UK when an exact catalog variant can be matched. Retailer availability varies by product.

### Why is a UK price missing for a product?

A blank UK price means the collection did not find a credible exact-match displayed or structured price. Challenge pages, 404 pages, hidden prices, ambiguous variants, and unsupported pages are not recorded as prices.

### Can I compare a 2 lb tub with a 1 kg tub?

You can compare them after standardising the amount of actual protein, but first confirm the flavour and formulation. Do not treat different package sizes as the same retailer variant when checking a displayed price.

### Does the comparison include delivery and discounts?

The comparison uses the displayed product price, including an advertised sale price when shown. It does not normalise delivery, coupons, subscriptions, bundles, or member-only prices, so check the final basket total before buying.

Method note: UK prices are displayed or structured product-page prices collected from Amazon.co.uk and iHerb UK. Sale prices may be included when displayed. Shipping, taxes, coupons, subscriptions, bundles, and member-only prices are not normalised.

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