A capsule labeled “600 mg Ashwagandha Blend” can legally contain just 5 mg of actual ashwagandha. The rest can be cheap fillers. And the company that made it doesn’t have to tell you.
That’s not a hypothetical worst case — it’s a real, legal, and widely used practice called a proprietary blend. If you take supplements regularly, there’s a reasonable chance you’ve bought one without realizing it.
What a Proprietary Blend Actually Is
Under the Dietary Supplement Health and Education Act of 1994 (DSHEA), supplement manufacturers are required to list all ingredients on the label. But they’re not required to disclose the individual amounts of ingredients within a labeled “blend.” The FDA allows companies to declare one total weight for a group of ingredients, as long as those ingredients are listed in descending order by weight.
So a brand can put 850 mg of maltodextrin, 100 mg of caffeine, and 50 mg of a trendy adaptogen into a “1,000 mg Performance Matrix” — and list it exactly that way. The adaptogen gets top billing in the marketing copy. The cheap filler does most of the filling.
That descending-order requirement is the only meaningful consumer protection built into this rule. The first ingredient listed in a blend is present in the highest amount; the last is present in the smallest. But since you never see exact milligrams, you can’t know whether the difference between first and last is 20 mg or 800 mg.
The term industry insiders use for this is “fairy-dusting.” A brand fairy-dusts an ingredient when they include just enough of it to list it prominently on the label — typically far below any dose shown to produce a measurable effect in clinical studies — and then lean on it heavily in their marketing. It’s deceptive by design, without technically violating the law.
Why Brands Do This — And It’s Not Just About Protecting Trade Secrets
The most common defense you’ll hear from supplement companies is competitive protection. The argument goes that disclosing exact formulas lets rivals copy them. There’s a kernel of legitimacy to that for genuinely novel formulations. But it gets applied far more broadly than it deserves — including to products built on ingredients that have been publicly studied for decades.
The more honest explanation is cost. Ingredient prices in the supplement industry vary enormously. Bacopa monnieri extract can run a manufacturer $60–$120 per kilogram depending on standardization and sourcing. Citicoline costs roughly $80–$150 per kilogram at clinical-grade purity. Compare that to rice flour at under $2 per kilogram, or maltodextrin at about $1.50 per kilogram. When you’re moving millions of units at $45–$80 a bottle, even small reductions in the loading of premium ingredients per capsule translate into significant margin improvement.
Hiding individual amounts behind a blend name lets brands feature expensive, research-backed ingredients prominently — on the front label, in advertising, in influencer talking points — while actually delivering sub-therapeutic doses that cost almost nothing to produce.
A 2019 analysis by the Clean Label Project evaluated more than 400 protein powders and found systematic accuracy problems across the industry. Products with undisclosed proprietary formulations were among the hardest to assess, precisely because there was no declared baseline to test against. If you don’t say how much of something is supposed to be in there, no one can prove the amount is wrong.
The Dose Gap Between Label Claims and Clinical Evidence
This is where proprietary blends cause real consumer harm — not always because they’re dangerous, but often because they’re simply useless.
Clinical research on popular supplement ingredients uses specific, tested dose ranges that aren’t arbitrary. They come from human trials with measurable outcomes:
- Ashwagandha (KSM-66): 300–600 mg/day studied for cortisol reduction and stress response
- Citicoline: 250–500 mg/day studied for cognitive support and sustained attention
- Rhodiola rosea: 200–600 mg/day studied for fatigue resistance and mental performance
- Magnesium glycinate: 200–400 mg/day for sleep quality and muscle recovery
- Lion’s mane mushroom: 500–1,000 mg/day in studies examining nerve growth factor support
When a supplement shows a “Brain Performance Blend: 900 mg” containing six of these ingredients, the math becomes uncomfortable. Even assuming each is present in equal amounts — which it won’t be in a descending blend — that’s just 150 mg per compound. Ingredients listed near the bottom may contribute as little as 10–20 mg each.
At 10 mg, you are not getting a therapeutic dose of anything. You’re getting an ingredient on a label.
What FDA Regulation Covers — And What It Doesn’t
It’s worth being honest about the regulatory landscape, because there’s a lot of misinformation floating around it in both directions.
The FDA does not pre-approve dietary supplements before they reach store shelves. Under DSHEA, the burden of ensuring safety and basic label accuracy sits with the manufacturer, not the agency. The FDA takes enforcement action after problems surface — issuing warning letters, initiating recalls, pursuing legal action — but routine pre-market formula review doesn’t exist for supplements the way it does for drugs.
The agency’s 2023 dietary supplement modernization strategy explicitly acknowledged gaps in post-market oversight. As of 2026, mandatory product listing is in effect, requiring manufacturers to register supplement products with the FDA and maintain a public database entry. But registration doesn’t trigger a formula review or independent potency verification. It mostly establishes that the product exists.
The FTC, meanwhile, handles advertising claims. If a brand says “clinically proven” for a formula that has never actually been tested as a complete product, that’s technically an FTC enforcement matter. But the agency’s resources are finite against an industry the Council for Responsible Nutrition estimates at over $60 billion annually in the US — enforcement actions against individual products are far less common than the scale of the problem warrants.
The practical upshot: a supplement can be fully compliant with federal law while delivering essentially nothing meaningful inside the capsule. Legal is not the same as effective.
How to Protect Yourself When Buying Supplements
You don’t need to swear off supplements. You do need to be a more deliberate reader of labels.
Check the Supplement Facts panel before anything else. If you see the words “Blend,” “Matrix,” “Complex,” “Proprietary Formula,” or “Fusion” next to a milligram total and a list of ingredients without individual amounts, that structure — in any form — is a proprietary blend. Note it, and proceed with skepticism.
Look for fully transparent labeling. Some brands, particularly as consumer awareness has grown, list every ingredient with its own individual weight on a separate line. “Ashwagandha (KSM-66): 600 mg” declared independently means you can cross-reference that dose against published clinical research and make a real, informed decision. Brands that label this way are inviting accountability — and that matters.
Don’t over-rely on third-party certifications alone. NSF Certified for Sport, Informed Sport, and USP Verified are all genuinely useful — they test for contaminants, banned substances, and whether the blend’s total weight matches the label. But they verify against the label’s own claims, not against a clinical-dose standard. A fully certified product can still be fairy-dusted. Certification is a floor, not a ceiling.
Ask for a Certificate of Analysis. Any manufacturer worth buying from should provide a CoA from an independent, ISO 17025-accredited laboratory on request, or post them publicly. A CoA shows actually measured potency and ingredient identity — real tested quantities, not intended formulas. If a company won’t produce one, or takes three weeks to respond to a simple request, that reluctance is itself useful information.
According to testing data from Qalitex Laboratories, supplements with fully disclosed individual ingredient amounts show significantly lower batch-to-batch potency variation than those concealed inside proprietary blends. That makes intuitive sense: you can only hold yourself accountable to a standard you’ve committed to declaring publicly.
Compare cost-per-effective-dose, not sticker price. A “budget” supplement at $19.99 with a proprietary blend may be far more expensive per therapeutic dose than a transparent-label product at $45, if the cheaper one delivers a fraction of the clinically studied amount. The sticker price is almost never the real price.
The Transparency Shift Already Underway
Something is changing in the supplement market, slowly but measurably. A growing number of brands — especially in sports nutrition and nootropics — have moved to fully transparent labeling as a deliberate competitive differentiator. Third-party certifications from NSF and Informed Sport are appearing on more products. Major retailers, including Amazon, have implemented stricter third-party testing requirements for supplements sold on their platforms.
Consumer demand is driving it. A 2023 SPINS market report found that “transparent label” claims on supplement products grew 18% year-over-year. Brands are responding because buyers are asking better questions.
The most powerful thing you can do is keep asking them. Request Certificates of Analysis. Check clinical dose ranges before purchasing. Look for companies that list every ingredient independently. The supplement industry improves when consumers make clear that hiding a formula isn’t a feature — it’s a reason to shop elsewhere.
Written by Nour Abochama, Host & Quality Control Expert, Nourify & Beautify. Learn more about our team
Have questions about product safety? Talk to our experts. Contact us
Related from our network
- How Independent Labs Verify Supplement Potency and Ingredient Identity — Qalitex Laboratories explains the testing methods used to confirm what’s actually inside a capsule, from HPLC potency assays to identity verification.
- What a Certificate of Analysis Actually Tells You About Raw Ingredients — Ayah Labs breaks down how to read a CoA for raw material sourcing, so you know what transparency looks like before the product is even made.
