You’re looking at a pre-workout supplement. The label lists twelve impressive ingredients — citrulline, beta-alanine, lion’s mane, ashwagandha, a stack of B vitamins and adaptogens. Underneath them all: “Proprietary Performance Blend: 3,200mg.”
It looks comprehensive. It looks like science. It looks like you’re getting a lot for your money.
You are probably getting very little.
What a proprietary blend actually means
A proprietary blend is a group of ingredients listed together under a single name, with only the total weight of the blend disclosed — not the individual doses of each ingredient inside it.
This is entirely legal. In most markets, including the EU and the US, supplement manufacturers are required to list every ingredient — but they are not always required to list each ingredient’s individual dose if those ingredients are grouped under a blend. The total blend weight must be declared. The breakdown does not.
“A product can contain 3,150mg of a cheap filler and 50mg of the active ingredient you’re actually paying for — and label it as a 3,200mg proprietary blend. Everything on that label is technically accurate.”
Why brands use them
The industry justification is intellectual property protection — brands argue that their specific formulation ratios are trade secrets worth protecting from competitors. There is some truth to this in genuinely innovative products.
The reality, in most cases, is simpler. Proprietary blends allow manufacturers to use the minimum effective — or often sub-effective — dose of expensive, research-backed ingredients, bulk the formula with inexpensive fillers, and present the result as a premium, comprehensive product.
They also make it impossible for you to evaluate whether the product is worth buying. Which is, of course, the point.
I have reviewed formulations where a key active ingredient — the one featured prominently in the marketing — appeared in quantities as low as 1–2% of the total blend weight. The research-backed dose for that ingredient was fifteen times higher. The product sold well. The marketing never mentioned doses.
How to spot a proprietary blend on any label
Look at the Supplement Facts panel. If you see a group of ingredients listed together with a single total weight beside the group — and no individual weights per ingredient — that is a proprietary blend. It may be called a “blend,” a “matrix,” a “complex,” a “formula,” or a “stack.” The name changes. The structure is the same.
Some labels list ingredients within the blend in descending order by weight — which is a legal requirement in many jurisdictions. This tells you which ingredient has the highest amount in the blend, but not how much of any of them you’re actually getting.
Why ingredient order inside a blend still misleads you
Descending order sounds helpful. It is less helpful than it appears.
If a blend contains citrulline, beta-alanine, and taurine — listed in that order, descending by weight — it tells you citrulline is the most abundant. It does not tell you whether citrulline is present at 2,000mg (an effective dose) or 400mg (a dose with no meaningful effect). Both scenarios produce the same label.
A brand that wants to feature a popular, expensive ingredient prominently in its marketing simply needs to include more of it than anything else in the blend — even if “more” means a clinically meaningless amount.
What to do instead
The rule is simple: buy supplements that list every active ingredient with its individual dose in milligrams. This is called a fully disclosed or open-label formula. Every reputable, research-led supplement brand does this — not because they’re required to in every market, but because transparency is a selling point when your product is actually good.
If a brand hides its doses, ask yourself why. The most likely answer is that the doses wouldn’t impress you if you could see them.
Before buying any supplement, ask: “Can I see the individual dose of every active ingredient on this label?” If the answer is no — walk away. There are enough transparent products on the market that you never need to guess what you’re paying for.
A note on when blends are acceptable
Not all blends are automatically bad. Some combinations of ingredients are genuinely synergistic and the total dose matters more than the individual components. Some smaller brands use blends for legitimate IP reasons and are otherwise highly reputable.
But even in these cases — if a brand won’t tell you what’s in their product and at what dose, you are being asked to trust them on faith. In an industry with as many quality problems as supplements, that faith is rarely well-placed.
Transparency costs nothing. Opacity almost always serves the manufacturer, not you.
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