Supplement Proprietary Blends: Reviewed Records and Label Checks

A proprietary-blend entry can leave individual ingredient amounts undisclosed. Check the actual product label and the scope of a reviewed finding rather than assigning the same conclusion to every product from a brand.

What our review currently establishes

• 0 brands: a reviewed finding records use of proprietary blends.
• 0 brands: a reviewed finding records no use within its documented scope.
• 7882 brands: no current reviewed finding establishes either conclusion.

The unknown group is not a list of transparent brands. These counts describe our review coverage, not the proportion of the supplement market using blends. A negative finding must be read with its source and scope; it is not a guarantee about all past or future products.

How a proprietary blend can appear on a label

FDA labeling guidance describes listing a blend’s combined weight and the component ingredients in descending weight order, while nutrients with established reference values have separate amount requirements. The combined weight does not reveal each component’s amount. See FDA’s guidance on proprietary-blend labeling.

That creates a limit on what you can compare. It does not by itself prove an ingredient is underdosed, contaminated or ineffective. Those conclusions would require separate evidence.

Read the blend without guessing the amounts

1. Photograph the complete Supplement Facts panel and ingredient list.
2. Identify the blend name, total weight and component names.
3. Separate amounts disclosed individually from amounts hidden within a combined total.
4. Ask the manufacturer for missing information about the exact formulation.
5. If the product cites a study, compare its formulation and disclosed quantities with the study’s actual intervention.

Can a tested product still have a blend?

Check what the testing program or report actually covers. A certification does not automatically disclose every ingredient amount or validate every advertised benefit. Conversely, a label with individual amounts does not establish independent testing. These are separate evidence questions.

Why we do not compare average scores here

An average across unreviewed database records would hide the coverage problem. Even an average of complete reviews would reflect the transparency rules built into the scoring method; it would not be an independent clinical study of proprietary blends.

Continue with reading supplement labels, understanding blend claims, or the ashwagandha extract checklist.