Why Labels Can't Always Be Trusted

The protein supplement industry is largely self-regulated. Brands write their own labels, calculate their own macros, and set their own serving sizes. Third-party testing (Labdoor, Trustified) exists precisely because label claims aren't always accurate โ€” and some brands have actively gamed the system.

Trick #1: Inflated Serving Sizes

This is the most common manipulation. A brand sets a 40g serving size instead of 30g, so the protein-per-serving number looks impressive (32g protein vs 24g). The protein percentage is identical โ€” but the casual buyer sees a bigger number.

How to catch it: Always divide protein per serving by serving size. If you get a percentage below 70%, you're getting less than you might think relative to the cost.

Quick test: Protein % = (Protein per serving รท Serving size in grams) ร— 100. Anything under 70% warrants scrutiny. Over 85% in a concentrate is a good sign.

Trick #2: Amino Spiking (Nitrogen Spiking)

Protein content on labels is measured by nitrogen content. Cheap amino acids like glycine, taurine, and creatine are nitrogen-rich but aren't the complete proteins your body needs for muscle synthesis. Some brands add these to boost the apparent protein reading without increasing the quality protein content.

You'll spot this by scanning the ingredient list. If cheap amino acids appear high up (ingredients are listed by weight), especially in a product with no third-party certification, be suspicious.

Amino spiking isn't illegal โ€” it's just deceptive. Labdoor tests specifically for this, which is why certification matters more than the label's protein claim.

Trick #3: "Proprietary Blend" Labels

When you see "Proprietary Blend: 25g" on a label with several ingredients listed underneath, the brand is not required to disclose individual amounts. This is often used to hide that the expensive active ingredient is present in a negligible amount while cheaper fillers make up the bulk.

For pure whey protein, there's no reason for a proprietary blend. It should just say: whey protein concentrate (or isolate), lecithin, flavoring. Full stop.

Trick #4: "With Added BCAAs / Amino Acids"

This marketing phrase often accompanies amino spiking. If a product already contains high-quality whey, it has abundant BCAAs naturally. Adding more is either redundant (if they're real BCAAs) or a spiking indicator (if they're cheap free-form aminos).

What a Good Label Looks Like

FieldGreen FlagRed Flag
Protein %>75%<65%
Serving size25โ€“35g>40g with no justification
IngredientsWhey, lecithin, flavoringAmino acids high in list
Blend labelNone / transparent"Proprietary blend"
Third-party certLabdoor / TrustifiedNone + unusual claims

The One Number That Cuts Through All of It

Price per gram of protein. When you divide the product price by total protein in the container, all the serving-size games and label tricks become irrelevant. A product with an inflated serving size that costs โ‚น5.00/g protein is simply worse value than one at โ‚น3.20/g โ€” and the math shows it instantly.

That's why this site exists. Use the comparison table as your reality check before any purchase.