What is a proprietary blend, and why does it hide the doses?
A proprietary blend is a group of ingredients listed under one name, like "Recovery Matrix", with only their combined weight shown. Federal rule requires that total weight and the ingredient order, not each amount. That's the loophole: a 4,000 mg blend can be 3,900 mg of the cheapest ingredient and a trace of everything else.
You've seen it on a label: a name like "Recovery Complex: 5,200 mg" sitting where an ingredient list should be. It looks specific. It isn't. The number tells you the weight of the whole group and nothing about what's inside it.
What does the label actually have to disclose?
A company selling a proprietary blend has to name the blend, list every ingredient inside it in order from most to least by weight, and state the combined weight of the whole group. What it does not have to state is how much of any single ingredient that group contains [1]. Those are two different promises, and the label only keeps one of them.
There's one exception worth knowing. If a blend contains a vitamin or mineral that has an established Daily Value, like vitamin C or magnesium, that ingredient still has to carry its own individually listed amount even while sitting inside the blend [1]. The total-only rule applies to "other dietary ingredients", the category that covers herbs, amino acids, and specialty extracts, which is exactly the category most blends are built from.
Nobody checks this before the product ships. The FDA doesn't approve a supplement's label, or verify what's actually in the tub, before it reaches a shelf [2]. It can act after the fact if a label turns out to be false or misleading, but that's a cleanup process, not a gate [2]. The system runs on the manufacturer's word until someone challenges it.
Why would a brand list an ingredient it won't dose?
The industry's own explanation is that this protects a formula from being copied. The Council for Responsible Nutrition, the supplement industry's trade group, describes the allowance as existing "to protect trade secrets such as the exact ingredient amounts in a product" [3]. That's a real incentive, and a defensible one for a genuinely original formula.
It's also a convenient place to hide a cheap one. If the label only has to show a combined weight, a company can load a blend with an inexpensive bulking ingredient, add a small amount of whatever ingredient is trending that year, and print both names under one number. The blend total looks substantial. Most of it can be filler, and the label alone won't tell you.
How do you check whether an ingredient is at a working dose?
You can't get an exact number from a blend label. You can get a ceiling. Ingredients inside a blend must be listed in order from most to least by weight [1], so an ingredient listed fourth of six can't weigh more than the ingredient listed third. Once you know roughly how much of the total the ingredients ahead of it plausibly take up, you can work out how little is left for the one you actually wanted.
A 2019 study in the journal Nutrients pulled the labels of the 100 best-selling pre-workout supplements and checked them against published effective-dose thresholds. Proprietary blends showed up in 58 of the 100 products, and across the full sample, 44.3% of all listed ingredients sat inside a blend with no individual amount disclosed [4].
Beta-alanine, one of the more studied ingredients in that category, averaged just 2.0 g across the products that listed it, against a minimum effective dose of 4 g a day used in the sports-nutrition literature [4]. Citrulline told a similar story: it appeared in 71% of the products, but among those that listed an amount the average was 4.0 g against the 6 g minimum ergogenic dose the authors used as their threshold, and only 37.5% of them reached it [4].
The study's own authors put it plainly: it was "difficult to determine whether individual ingredients in a proprietary blend are included in doses sufficient to elicit ergogenic effects" [4]. They had the full label data in front of them. You, standing in an aisle, have less.
The three words that mean check this
"Blend", "complex", and "matrix" are the words to watch on a Supplement Facts panel, along with any invented product name sitting where an ingredient should be. If you see one bolded weight with a list of ingredient names indented underneath it and no individual number next to any of them, that's a proprietary blend, whatever it's called. A single named ingredient with its own milligram or gram amount printed next to it is not; that's what a normal Supplement Facts line is supposed to look like.
This matters more for some ingredients than others. A blend that hides caffeine or another stimulant inside a bigger number means you don't know your stimulant dose, which is a different kind of risk than not knowing your citrulline dose [5].
[Image placeholder: a Supplement Facts panel with several ingredient names indented under one bolded "Proprietary Blend 4,000 mg" line, with no individual amount next to any of them, next to a panel with a single ingredient and its own gram amount for comparison.]
Why AUROM's products can't have a proprietary blend
This isn't a claim so much as a structural fact. AUROM's creatine monohydrate has one ingredient: 5 g of micronized creatine monohydrate per scoop, printed on the label, with a Certificate of Analysis available per batch. There's no second ingredient to group it with, so there's nothing to call a blend.
The whey protein isolate works the same way: three ingredients, whey protein isolate, natural flavors, and stevia extract, each named on the label rather than grouped under an invented blend name. A proprietary blend needs at least two ingredients hiding behind one collective number. Name the ingredients individually and there is nothing left to blend. AUROM doesn't use a proprietary blend on anything it sells, and that's a labeling decision rather than a workaround for one product.
Frequently asked questions
Is a proprietary blend illegal? No. It's explicitly allowed under federal rule, as long as the label states the blend's total weight and lists the ingredients in descending order by weight [1]. The law trades individual disclosure for trade-secret protection. It doesn't ban the practice.
Does the FDA check what's actually in a blend before it's sold? No. The FDA doesn't approve or verify a dietary supplement's label before it reaches the market [2]. It can act after the fact if a label is proven false or misleading, but there's no check beforehand on whether a blend's real contents match what's printed.
Can vitamins and minerals hide inside a proprietary blend? Not their amounts. A vitamin or mineral with an established Daily Value still has to show its own individually listed amount, even while grouped inside a blend [1]. It's ingredients without a Daily Value, mostly herbs, amino acids, and extracts, that can disappear into a group total.
What's the difference between a proprietary blend and fairy dusting? A proprietary blend hides the dose entirely behind a group number. Fairy dusting is a different problem: the ingredient has its own disclosed amount, you can see the number, and it's just too small to do anything.
Is a proprietary blend always a bad sign? Not automatically. It means you can't verify the dose from the label alone, which is the actual problem. Some blends are dosed well. You have no way to tell which ones without the company's word, independent lab testing, or a product that prints the number instead.
The five-second check
Look at the ingredient section before you look at anything else on the label. If every ingredient has its own number next to it, you're looking at a dose. If several ingredient names sit indented under one bolded weight, you're looking at a total, not a dose, no matter how official the name above it sounds. Now you know which one you're reading.
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.
Sources
- 21 CFR 101.36, Nutrition labeling of dietary supplements, U.S. Government Publishing Office.
- Background Information: Dietary Supplements, NIH Office of Dietary Supplements.
- Regulatory responsibilities and best practices for manufacturing and marketing dietary supplements containing proprietary blends, Council for Responsible Nutrition.
- Common Ingredient Profiles of Multi-Ingredient Pre-Workout Supplements, Jagim, Harty & Camic, Nutrients (2019).
- Proprietary blends: What does this mean?, Operation Supplement Safety.