Why I Built ProteinDeals, and How the Comparisons Work

Websites selling protein powder are not in short supply, and that's actually the problem. Finding the genuinely best deal means opening brand sites, supplement retailers, marketplaces and high-street shops one after another. Each presents pack sizes, flavours, discount codes and nutrition panels differently, so a fair comparison quickly turns into a slog.

A £30 bag isn't automatically better value than a £40 one. The cheaper option might just be smaller, or contain less protein per 100g. Sale percentages don't help much either, since 50% off an inflated reference price can still cost more than an ordinary offer sitting elsewhere.

ProteinDeals exists to do that repetitive comparison once, in one place. The goal is to show what each product actually costs for the protein it delivers, so spotting the strongest current deals across different websites takes minutes instead of an evening.

The core value metric is price per 1g of protein. ProteinDeals takes the pack price, the total pack weight and the protein declared per 100g, then works out how many grams of actual protein the whole product contains. Dividing price by that total gives a like-for-like cost for a single gram of protein.

As an example, a 1kg powder with 80g of protein per 100g contains 800g of protein in total. At £24 a bag, each gram of protein costs 3p. A different 1kg bag might cost only £22, but with just 65g protein per 100g it only contains 650g of protein, working out to roughly 3.38p per gram. The cheaper shelf price is, in that case, the worse protein deal.

Nutrition is shown per 100g because it keeps calories, protein, carbohydrates and fat directly comparable without manufacturer scoop sizes getting in the way. Price per 1g of protein is the sharper value measure on top of that: it folds a product's price, size and protein concentration into one number.

That stops a large bag from winning simply because it is large, and stops a protein-dense powder being judged only by its higher shelf price. You can still filter by category, so whey, isolate, vegan protein and mass gainers get compared against products built for a similar purpose rather than against each other.

Discounts are shown wherever they can be identified, but a code can expire, exclude a flavour, or require a minimum spend. The retailer's checkout is always the final price check. The deals page is a starting point, not a promise that every promotion applies to every basket.

A useful listing takes more than a headline price copied off a shop page. The offer has to be matched to the correct product, weight and flavour, then combined with the right nutrition per 100g. Only once that's done can price per 1g of protein be calculated and compared fairly.

Price history adds context a single snapshot can't provide. A dramatic crossed-out RRP might still just be an ordinary selling price, while a modest-looking reduction can turn out to be a genuine low. Watching how a price has moved over time helps you judge a sale rather than simply trusting its label.

Retail pages change, nutrition varies by flavour, and data feeds occasionally fail. Those are real limits of any comparison service. The methodology page explains how ProteinDeals tracks UK prices, and the contact page is the fastest route for flagging a mismatch.

A sort by price-per-1g-of-protein is deliberately unsentimental: a lesser-known product can rank above a famous one simply by supplying protein more cheaply. That's useful evidence, but it can't measure taste, texture, digestive comfort, ingredient preferences, or how much you trust a particular manufacturer.

That's why the editorial guides treat price as one input rather than the whole verdict. An isolate may be worth more to someone limiting lactose, an Informed Sport-tested product may matter to a tested athlete, and a pricier flavour you reliably finish can be better value than a bargain bag left half-used in the cupboard.

Some outbound retailer links can earn ProteinDeals a referral fee without increasing the price you pay. That helps fund the project, but it shouldn't change the underlying comparison, and commercial links are clearly labelled rather than presented as independent evidence.

Start with the comparison page for the type of product you actually want. Sort by price per 1g of protein to find the strongest raw value, then check protein, calories, carbohydrates and fat per 100g alongside pack size. Opening the product page shows available retailers in one place, saving you from repeating the same search across a dozen sites.

Treat unusually low figures as something to verify, not something to trust blindly. Make sure the retailer page opens on the same size and flavour, check delivery charges, and confirm any code actually works before paying. Marketplace listings deserve an extra check of the seller and fulfilment details.

Finally, choose something you'll actually keep using. Price per 1g of protein is excellent at exposing a misleadingly cheap bag or an inflated sale, but it isn't the only consideration. The cheapest protein is not good value if its flavour, ingredients or texture mean you stop using it halfway through the tub.

The useful direction from here is better context, not simply more listings: clearer variant matching, longer price histories, stronger nutrition checks, and guides that explain when the cheapest product is actually the wrong choice for a particular need.

Corrections are part of that ongoing work. If you spot the wrong size, an outdated nutrition panel, a dead offer, or a missing retailer, send the product URL through the contact page. A specific example is far more useful than a general complaint, and it can improve the comparison for everyone else too.

The aim stays simple: save people from spending an evening checking the same product across a pile of browser tabs, make the true price of 1g of protein easy to see, and leave the final choice with the person actually buying it.