Category: Label literacy

A proprietary blend is a group of ingredients disclosed on a Supplement Facts panel as a single combined weight, with the individual amounts withheld. It is legal, it is common, and it is the single largest blind spot on a supplement label.

What the rule actually requires

For a proprietary blend, the manufacturer must disclose two things: the total weight of the blend, and the ingredients in descending order by weight.

That is the whole requirement. The amount of each individual ingredient can be omitted.

So a label reading:

Proprietary Sleep Matrix — 1,200 mg Valerian root, passionflower, chamomile, melatonin

tells you truthfully that there is more valerian than passionflower, more passionflower than chamomile, and more chamomile than melatonin. It is entirely consistent with that blend containing 1,190 mg of valerian and roughly ten milligrams split across the other three.

Why this matters more than it sounds

The pattern the disclosure rule permits is sometimes called fairy dusting: including a scientifically interesting ingredient in an amount far below any studied dose, so it can appear on the label and in the marketing without meaningfully contributing to the product.

The order requirement is a real constraint and it is worth using. If the ingredient the entire advertisement is built around appears last in a four-item blend, you know it is the smallest component by weight. That is often enough to make a decision.

The legitimate case for blends

It would be unfair to treat every proprietary blend as concealment. The stated rationale — protecting a formulation from being copied by a competitor — is real, and formulation work does represent genuine investment.

The problem is that the disclosure rule cannot distinguish between a company protecting real work and a company hiding an underdosed formula. Both look identical on the panel. So the burden lands on the buyer, and the reasonable response is not to assume bad faith, but to note that you have been given less information and to weight the product accordingly against a competitor that disclosed fully.

A practical rule

When comparing two products, treat full per-ingredient disclosure as a feature you are willing to pay for. A company that publishes exact amounts is inviting you to check its doses against the literature. A company that does not has declined that invitation, whatever its reason.

If you want to go one step further, third-party testing answers a different question again: not what the label claims, but whether the capsule matches it.

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Most people buy a supplement based on the front of the bottle. The front is marketing. The back is regulated, and once you know how to read it, it tells you considerably more than the marketing does — including, sometimes, that there is very little in the bottle.

The panel itself is required. The claims on the front are not verified.

Under the Dietary Supplement Health and Education Act of 1994, dietary supplements in the United States are not approved by the FDA before they go on sale. The manufacturer is responsible for the safety and labeling of the product; the FDA generally acts after a product is already on the market.

This is the single most important thing to internalize, because it inverts the assumption most shoppers bring from the pharmacy aisle. A prescription drug had to prove it works before it could be sold. A supplement did not.

What is required is the Supplement Facts panel, and its format is specified in federal regulation. That is the part of the bottle that has to be truthful in a structured way.

Reading the panel line by line

Serving size. Check this before anything else, because every number below it is per serving, not per capsule. A bottle advertising “1,200 mg” that lists a serving size of three capsules contains 400 mg per capsule. A 60-count bottle at three capsules a day is a twenty-day supply, not two months.

Amount per serving. The quantity of each ingredient. Compare this against the dose actually used in research on that ingredient, not against the largest number on the label.

% Daily Value. Percentages are calculated against a general reference intake based on a 2,000 calorie diet. Ingredients with no established Daily Value show a dagger and a footnote instead. The absence of a %DV is not a red flag; it usually means the ingredient is a botanical or a compound without a federal reference intake.

Other ingredients. Everything not counted as an active: binders, flow agents, capsule material, colorings. Worth reading if you avoid gelatin, particular allergens, or specific dyes.

The part that is missing on purpose

The panel tells you what is claimed to be in the bottle. It does not tell you:

• whether the amount in the capsule matches the amount printed
• whether the raw material was contaminated
• whether the ingredient does anything at the dose listed

Those three gaps are the reason independent testing exists, and the reason a label alone can never settle whether a product is worth buying.

Structure/function claims, and the sentence that gives them away

If the label says a product “supports immune health” or “promotes restful sleep,” you are reading a structure/function claim. Those are permitted without FDA review, and they come with a mandatory disclaimer, printed somewhere on the package in small type:

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

That sentence is not boilerplate to skim past. It is the legal boundary of the claim. A product legally allowed to say it “supports joint comfort” is not legally allowed to say it treats arthritis — and if the marketing around it implies that it does, the marketing has crossed a line the label itself respects.

What to actually do with this

Photograph the panel and compare it against the published research on the two or three ingredients that the marketing leans on hardest. If the marketing rests on an ingredient present at a fraction of the studied dose, you have learned the most useful thing there is to learn about that product, and it took four minutes.

Next, read what proprietary blends hide — because the comparison above only works when the label discloses per-ingredient amounts, and often it does not.

This article may contain affiliate links. If you buy through one we may earn a commission at no extra cost to you. It does not affect what we write or which products we cover — see our affiliate disclosure.