Field guide
What Is a Proprietary Blend? Why Hidden Doses Are a Red Flag
The short answer
A proprietary blend is a labeling practice where a brand lists a group of ingredients under one total weight ("Energy Blend, 1,200 mg") without disclosing individual doses. It's legal under FDA labeling rules — ingredients must be listed in descending order by weight, but amounts stay hidden. The problem: you cannot verify whether any single ingredient reaches its clinically studied dose, so the honest default is skepticism.
How the trick works
Ingredients in a blend are listed in descending order by weight, so the first ingredient dominates. A "1,200 mg blend" whose first ingredient is a cheap bulk powder can contain trace amounts of everything else on the list — including the famous ingredients the marketing is built on. The label is technically accurate and practically uninformative.
Brands defend blends as protecting a "proprietary formula" from copycats. In practice, competitors can reverse-engineer anything with lab testing; the only party the blend keeps in the dark is the customer.
A worked example
Take a hypothetical "Focus Blend — 800 mg" containing bacopa, L-theanine, and ginkgo. Bacopa RCTs used ~300 mg of standardized extract; L-theanine studies commonly used 100–200 mg; ginkgo trials used 120–240 mg. If all three were at studied doses, the blend would need to be 520–740 mg minimum — plausible, but the ordering could just as easily mean 700 mg bacopa and dustings of the rest, or the reverse. You genuinely cannot know, and that's the point.
How to score the unverifiable
The intellectually honest policy is: unverifiable doses cannot earn efficacy credit. BioStacks flags blend ingredients with a "Proprietary blend" badge and scores them conservatively — a blend can't outrank a transparent label that discloses every dose. When a brand publishes full doses, that transparency is itself a quality signal.
Do it in BioStacks — in 60 seconds.
- 1
Scan the blend
The scanner detects proprietary blends automatically and marks each hidden-dose ingredient.
- 2
See the penalty explained
The product page shows why the score is low: "Proprietary blend — per-ingredient doses not disclosed."
- 3
Swap for transparency
Search the same ingredients in the catalog and filter for products that disclose full doses — they score higher for a reason.
Related guides
This guide is for informational purposes and is not medical advice. Doses cited are those used in published studies, not personal recommendations. Consult a healthcare professional before use.