Pick up a pre-workout, a “focus” formula, or a testosterone-support product and you’ll often find something like this on the back:
Advanced Performance Matrix — 1,850 mg L-Citrulline, Beta-Alanine, Betaine Anhydrous, Taurine, L-Tyrosine, Alpha-GPC, AstraGin®, Huperzine A
Eight impressive ingredients. One number. And no way to know how much of any of them you’re actually taking.
That’s a proprietary blend, and learning to read one is among the most immediately useful supplement skills there is. It won’t tell you whether a product works — but it will very often tell you that it can’t.
What a Proprietary Blend Legally Is
Under US dietary supplement labeling rules, a manufacturer must disclose every ingredient in a product. It does not have to disclose the amount of each one, provided those ingredients are grouped into a named blend and the total weight of the blend is listed. Individual ingredients within that blend must appear in descending order by weight.
So the rules give you exactly two pieces of information: the total, and the ranking. Everything else is inference. This is legal, common, and used by both careless and careful brands — which is why the right response is analysis, not automatic rejection.
If the broader labeling picture is new to you, read this alongside our guide on how to read supplement labels, which covers serving sizes, Daily Values, and the other places numbers get slippery.
The Stated Reason vs. the Real One
What brands say: the blend protects a unique formulation from competitors who would otherwise copy the exact ratios.
Why that’s mostly thin: ingredient identities are already disclosed, any competitor can pay a lab a few hundred dollars to quantify a formula, and the genuinely effective doses of most of these ingredients are published in the research literature anyway. There isn’t much of a secret to protect.
The real reason, usually: cost. The expensive, well-studied ingredients are the ones you’d notice were under-dosed. A blend lets a brand put a trendy compound on the front panel while including a fraction of the dose that made it trendy — a practice known as fairy dusting or label decoration.
To be fair, there are limited legitimate cases: a genuinely novel herbal extract ratio, or a flavor system. They’re the minority, and they don’t require hiding a citrulline dose.
How to Analyze a Blend in 60 Seconds
You can usually reach a verdict fast.
1. Compare the blend total to one anchor dose
Memorize a handful of clinically studied doses and use them as measuring sticks. If a single ingredient’s effective dose approaches or exceeds the entire blend total, the product is under-dosed — no further analysis needed.
| Ingredient | Commonly studied daily dose |
|---|---|
| Creatine monohydrate | 3-5 g |
| Beta-alanine | 3.2-6.4 g |
| Citrulline (or malate) | 6-8 g |
| Betaine anhydrous | 2.5 g |
| Ashwagandha extract | 300-600 mg |
| L-theanine | 100-200 mg |
| Alpha-GPC | 300-600 mg |
Now revisit that 1,850 mg blend above. Citrulline alone is studied at 6,000-8,000 mg. Beta-alanine at 3,200 mg. Either one, properly dosed, would blow past the whole blend. So both are decorative, and everything ranked below them is present in trace amounts.
2. Count the ingredients against the total
Divide the total by the ingredient count for a rough average. A 500 mg blend with 12 ingredients averages ~42 mg each. Almost nothing works at 42 mg. Long ingredient lists inside small blends are a reliable signal that the list is marketing copy.
3. Read the descending order carefully
The ordering rule is the one honest thing about a blend. The first ingredient is the biggest, and it’s very often the cheapest bulk item in the formula — magnesium, taurine, glycine, maltodextrin, or a cheap amino. Anything listed after the bulk filler is, mathematically, smaller still.
Watch for one trick: an ingredient with a known dose disclosed separately outside the blend (caffeine is often broken out) tells you a ceiling for everything ranked below it in the blend.
4. Check whether it even needed to be a blend
If a brand can list transparent doses — and many now do, marketing it as an “open label” or “fully disclosed” formula — that’s a straightforward signal of confidence. In a market where transparency has become a selling point, choosing opacity is itself information.
The Safety Angle People Skip
Under-dosing wastes money. Opacity can do worse than that.
- Stimulants. If a blend contains caffeine plus other stimulant compounds without individual amounts, you cannot manage your total intake. This matters for anyone sensitive to caffeine, on stimulant medication, or with a heart condition or high blood pressure.
- Drug interactions. You can’t assess an interaction risk against an unknown dose. St. John’s wort, high-dose vitamin K, and various herbs interact meaningfully with prescriptions — see our supplement–drug interactions guide.
- Upper limits. Blends containing vitamins or minerals can push you over safe totals when combined with a multivitamin, and you won’t be able to do the arithmetic. Our supplement upper limits guide explains which ones matter.
- Pregnancy, nursing, and medical conditions. Any product whose contents you can’t quantify is a poor choice here, full stop.
- Adverse reactions. If a blend disagrees with you, there’s no way to identify the culprit — you’ve lost the ability to troubleshoot.
What Trademarked Ingredients Do and Don’t Tell You
Blends are often stuffed with trademarked names — the ®-and-™ ingredients with their own research programs and logos. These can be genuinely good ingredients, standardized and studied. But a trademark inside a proprietary blend tells you nothing about the dose, and trademarked ingredients also have studied doses that the blend total can be checked against. A branded ingredient at 5% of its studied dose is still 5% of its studied dose. Our guide to standardized extracts covers what those markings actually certify.
A Simple Buying Rule
You don’t need to boycott every blend, but a workable policy looks like this:
- Prefer fully disclosed labels. They exist in nearly every category now, often at similar prices.
- Reject any blend where a single ingredient’s studied dose exceeds the blend total. This alone eliminates most under-dosed pre-workouts.
- Be extra strict with stimulant and hormone-support products, where dose opacity carries real risk.
- Buy single ingredients when the dose matters. Creatine, citrulline, and beta-alanine are cheap as standalone powders, and you control the dose exactly.
- Favor brands with third-party testing, which at least verifies that what’s declared is what’s inside.
Building your own stack from transparent single ingredients is nearly always cheaper and always more verifiable; our guide on how to build a supplement stack walks through doing it deliberately.
Bottom Line
A proprietary blend is a legal way to show you a list of ingredients without showing you the doses — and the single most useful test is arithmetic: if one ingredient’s studied dose is close to or larger than the entire blend total, the formula is decorative. Use the descending-order rule, count ingredients against the total, and default to fully disclosed labels, especially for stimulants or anything you’re taking alongside medication. Transparency costs a brand nothing when the formula is honest.
This guide is educational and not medical advice. Talk with a qualified healthcare provider before starting any supplement — especially if you are pregnant, nursing, taking medication, or managing a health condition.