Proprietary Blends

Proprietary Blends: What the Label Is Allowed to Withhold

A legal provision that lets a manufacturer print a total weight and keep the individual doses to itself.

A blend tells you the ingredient ranking and nothing about the amounts. Treat it as information withheld, not as a trade secret you are obliged to respect.

The mechanism

Supplement labelling rules require per-ingredient amounts in the Supplement Facts panel, with one significant exception: ingredients may be grouped into a named proprietary blend and declared as a single total weight. Within the blend, ingredients must still be listed in descending order by weight.

So a 5 g blend headed by citrulline might contain 4.5 g of citrulline and traces of everything after it, or 1 g of citrulline and a long queue of near-zero extras. Both are legal. Both print an identical panel.

This is the single most consequential thing to recognise on a supplement label, because it converts the panel from a document you can evaluate into one you cannot.

The commercial logic, stated plainly

The usual justification is formulation secrecy — that disclosing exact ratios would let competitors copy the product. That argument has some force for genuinely novel formulations.

It has much less force for a blend of creatine, beta-alanine and citrulline, whose effective doses have been public for decades and are not anyone's intellectual property.

The asymmetry worth noticing: a manufacturer dosing generously has every commercial incentive to print the numbers, because generous doses are a selling point. Disclosure is cheap when the figures flatter you. Persistent non-disclosure in a well-understood category is weak evidence, but it points one way rather than the other.

Reading one anyway

You can still extract something. The total blend weight caps every ingredient in it — nothing inside a 3 g blend can be present at 4 g. Where a blend contains an ingredient with a known effective dose, compare that dose to the total.

If a 3 g blend lists beta-alanine first, and beta-alanine needs 3.2 g or more daily to do anything, the blend cannot be delivering an effective beta-alanine dose and anything else. The arithmetic settles it regardless of what is disclosed.

The cap is only informative if you know what the ingredient needs, which is why label literacy and a dose reference are complementary rather than interchangeable.

Partial disclosure is a real middle ground

Some labels disclose the headline ingredients individually and group only the minor ones into a blend. That is meaningfully better than burying everything, and it is worth recognising rather than treating all blends as equally opaque.

The question to ask is which ingredients ended up inside the blend. Hiding the dose of the ingredient the product is sold on is a different act from hiding a flavour system.