About Protein.supply

Four Policies That Drive Everything

Most supplement review sites have a structural problem: every product is “the best,” the negatives disappear, and the site exists to push affiliate clicks rather than help a buyer make a decision. Protein.supply was built around four policies that directly address this.

1. Honest critique on every product. Every review includes what we don’t like about it. This is non-negotiable. If a protein powder has a texture flaw, a sweetness problem, a formula that changed quietly, or a price that doesn’t hold up against alternatives — that goes in the review under “The Honest Critique.” It’s the section most sites skip. We treat it as the most important section.

2. Prices sourced from brand websites, not Amazon. We do not quote Amazon prices. They change hourly, they vary by seller, and quoting them creates a misleading comparison. Every price on this site is sourced directly from the brand’s own US or UK storefront, cited with a month and year: “from optimumnutrition.com, May 2026.” When prices change, we update. When we haven’t checked recently, we say so.

3. No sponsored placements. Brands cannot pay to appear in our guides, improve their position in comparisons, or have negative coverage removed. Our affiliate relationships (Amazon Associates, Awin) cover products we’d recommend regardless of commission. We link to what the data supports; we don’t rank what pays the most.

4. Full disclosure. Every page that contains an affiliate link carries a disclosure above the first link. Our Affiliate Disclosure names every programme we participate in. We earn commission on qualifying purchases — that relationship is always visible, never buried in a footer.

How We Review

What counts as reviewed

Product coverage begins with the brand’s own published data: nutrition label, ingredient list, serving size, certification status, and any published third-party test results. We do not fabricate nutritional claims. Every protein content figure, calorie count, and certification reference is drawn from the brand’s current label or a named independent testing body (Informed Sport, NSF, Informed Choice).

Where we assess taste, texture, and mixability, we use direct product testing. Where we rely on aggregated user experience — for flavors we haven’t personally tried, or size variants we don’t stock — we say so, and we cross-reference against independent review sources rather than retailer platforms.

Prices are re-verified at the start of each month directly from each brand’s US and UK storefronts. Every price on the site carries a timestamp. If a price is more than 60 days old, we flag it as potentially outdated.

What the honest critique standard means in practice

The Honest Critique section names the most common legitimate complaint about the product itself — not the shipping, not the packaging, not a third-party seller issue. The flaw has to be about the product.

Two examples from live reviews:

Isopure Zero Carb: “Thin and watery. Buyers expecting a thick, milkshake-style consistency are consistently disappointed — the zero-carb formula means no thickeners, so thinness is inherent to the product. Blending can produce foam without solving the texture.” This is a real, product-level trade-off that the label doesn’t flag. Someone managing lactose intolerance who prioritises zero carbs needs to know the texture cost upfront.

Dymatize ISO100 licensed flavors: “The licensed flavors are very sweet. Fruity Pebbles and Birthday Cake are designed to taste like sweet breakfast cereal and frosted cake. If you find those flavors cloying in food, you’ll find them cloying here. The more restrained flavors are better for daily use; the novelty flavors are best as a rotation option.” The product is excellent. The caveat is real. Both go in the review.

Critiques that we don’t include: complaints about Amazon fulfilment, packaging damage in transit, counterfeits from third-party sellers, or anything that’s a marketplace problem rather than a product problem. Those are out of scope and ineligible under our Amazon Associates obligations in any case.

Certification assessment

We treat third-party certification as a binary: either a product has current certification from a named, independent body, or it doesn’t. We do not treat marketing language like “tested” or “quality assured” as equivalent to named certification. The certifications we reference — Informed Sport, Informed Choice, NSF Certified for Sport, NSF Contents Tested, USDA Organic — are independently verifiable on each body’s published register. We check before we cite.

Updates and corrections

All pages carry a “Last reviewed” date. When a product is reformulated, discontinued, or significantly changed in price, we update before the next monthly price check. If we get something wrong and it’s pointed out to us, we correct it and update the date.

Who the Content Is For

The guides on this site are written for:

• Adults buying protein supplements for the first time who don’t want to wade through marketing claims
• People with specific requirements — lactose intolerance, low-carb, vegan, older adults — who want a direct answer on what to buy
• Anyone who has been burned by a review site that turned out to be an affiliate catalogue

All supplement guidance on this site is directed at adults and those aged 17 and over. The protein.supply team is not made up of registered dietitians or medical professionals. The approach is that of rigorous, independent consumer research: understanding what the nutritional science says, what brand marketing actually claims, and where those two things diverge.

Company

Protein.supply is a trading name of S5 Ltd, a company registered in the United Kingdom.

For questions or corrections: [email protected]

Last updated: May 2026