Do Proprietary Blends Hide Anything?
A "proprietary blend" line legally discloses a COMBINED total weight for a group of ingredients without breaking out each one's individual amount. The FDA permits this format provided the ingredients are listed in descending order by weight — so you can see WHAT is in the blend and its rank order, but not HOW MUCH of each specific ingredient it contains.
The one thing to know: A 'proprietary blend' line on a Supplement Facts panel lists total combined weight for a group of ingredients without breaking out each one's individual amount — the FDA permits this labeling format as long as the ingredients are listed in descending order by weight. That means you can see WHAT is in the blend and its rank order, but not HOW MUCH of each specific ingredient, which is the core piece of label opacity a proprietary blend introduces.
What the label shows you
- The blend's total combined weight (e.g., "Recovery Blend: 5g").
- Every ingredient inside the blend, by name.
- The order of those ingredients, which reflects descending weight — the first-listed ingredient is present in the largest amount of the group.
What the label does NOT show you
- The individual gram amount of any single ingredient inside the blend.
- Whether an ingredient near the bottom of the list is present in a meaningful amount or a trace ("fairy dusting").
Is this a labeling violation?
No — proprietary blend labeling is an FDA-permitted format for dietary supplements, provided the blend's total weight and the descending-order-by-weight ingredient list are shown. It is a disclosure format choice by the manufacturer, not a violation on its own. A product that instead lists each ingredient's individual dosed amount gives a materially more precise label to compare against.
How this connects to amino spiking
Proprietary-blend formatting is the same mechanism that makes amino spiking hard to spot from the front of the label: a cheap amino acid can sit inside a "protein blend" line without its individual gram amount ever being disclosed. See What Is Amino Spiking and How to Spot It for the specific ingredient-list pattern to check.
Frequently Asked Questions
A proprietary blend line legally lists the combined total weight for a group of ingredients without breaking out each individual ingredient's amount. The FDA permits this format as long as ingredients within the blend are listed in descending order by weight — so you can see WHAT is in the blend and its rank order, but not HOW MUCH of each specific ingredient it contains.
No — proprietary blend labeling is an FDA-permitted format for dietary supplements, provided the blend's total weight and the descending-order ingredient list are shown. It is a disclosure format choice by the manufacturer, not a labeling violation on its own.
You can compare total blend weight and ingredient rank order, but you cannot get an exact per-ingredient gram number from a proprietary blend label alone. Products that instead list each ingredient's individual dosed amount give you a materially more precise label comparison.