Proprietary Blends in Supplements: What the Label Can Tell You

Last updated: September 8, 2026

A combined blend weight can identify the total amount of a mixture while leaving the individual amounts unknown. That is a transparency limit, not a laboratory finding about the product.

How blend disclosure works

FDA’s labeling guide describes a blend’s total weight and component ingredients listed in descending weight order, with separate rules for nutrients that have established reference values. Read FDA’s proprietary-blend guidance.

A simplified example

Imagine a label showing a 1,000 mg blend containing ingredients A, B and C, without individual amounts. You know the stated total. You do not know whether A contributes 800 mg, 500 mg or another amount consistent with the label. The total alone cannot establish the individual quantities.

Do not turn that unknown into a claim that every component is too low or that one component is unsafe. Those conclusions need their own evidence. Equally, a study about a known amount of ingredient A cannot establish that this undisclosed mixture provides the same amount.

Questions that can resolve the gap

• Are individual quantities available for this exact formulation?
• Does the cited research test the finished product or only a component?
• Does a laboratory report identify the finished product and lot?
• What does the certification program actually check about the formula?
• Has the formulation changed since the source document was issued?

Compare alternatives fairly

A label with individual amounts is easier to compare for dose disclosure, but it does not automatically establish independent testing or a clinical benefit. A blend can also have a certification whose scope does not answer every quantity question. Keep label transparency, product testing and health evidence separate.

How the directory records blends

Our reviewed blend directory distinguishes accepted findings from unknown coverage. Missing data is not counted as a fully transparent label. Check the finding’s scope before extending it to other products from the brand.

Continue with the label worksheet, the pre-workout directory or the protein powder directory.

Guide text updated 2026-09-08. Individual evidence records have their own review dates. Read the evidence method.

Look up a brand’s reviewed evidence →