This is the single most useful thing you can learn about supplement labels, it takes ten seconds per product, and almost nobody does it. Here is the whole method.
What a proprietary blend is
US labelling rules let a manufacturer group several ingredients under one blend name, list them in descending order by weight, and declare only the total weight of the blend. Every individual amount then disappears behind that one number.
The stated reason is trade secrecy — a competitor could otherwise clone the formula. The practical effect is that you cannot tell whether the ingredient the front of the box shouts about is most of the blend or a trace of it.
The division
Take the blend total. Divide by the number of ingredients named under it. That is the average.
It is a crude number and it is not what any single ingredient actually contains — but it is an anchor, and it is usually enough to answer the question you came with. If the average is in grams, the formula is at least in the territory of the research. If it is in single-digit milligrams, it is not, and no amount of marketing changes that.
Then do the extreme case
This is the step that makes the division bulletproof, and it takes one more second.
Ask: what if one ingredient took the entire blend, and the other twenty got nothing at all? Compare that number — the whole blend total — against the studied dose of your headline ingredient. If even the total falls short, then no distribution of the blend, however lopsided, can reach the studied dose for that ingredient. The conclusion holds without knowing the split at all.
That is a genuinely strong argument, because it does not depend on any assumption about how the blend is divided. It is the one to reach for.
Reading the order
Descending order by weight is the only extra information you get, and it is worth using:
- The first name in the blend is the largest single component. Nothing says by how much.
- The last names are the smallest. If the ingredient the packaging is built around is near the bottom, that tells you something.
- A blend where an expensive ingredient is listed last and a cheap filler-ish one first is the classic pattern worth noticing.
What the answer does and does not mean
A small blend total does not mean a product does nothing. Some compounds are active in microgram quantities; some formulas are designed as gentle daily support rather than as a therapeutic dose; and a concentrate ratio genuinely does change what a milligram represents (that is its own article).
What a small blend total does mean is narrower and completely defensible: on those ingredients, you cannot compare the product against anything else — not against a competitor, not against a study, not against the same brand's last formulation. That is the information a blend removes, and knowing it has been removed is itself worth having.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. This article is general information and is not medical advice.