Does a proprietary blend have to say how much?

Two opposite opinions circulate about proprietary blends. One says they are a legal way to hide everything. The other says they are fine and the criticism is overblown. The rule is specific enough that neither is right.

What the rule requires

Descending order. The ingredients inside the blend have to be declared “in descending order of predominance by weight”, indented under the blend name. So the first one listed is the one there is most of.

A total. The blend must carry a quantitative amount by weight, and the regulation says that amount “shall be the total weight of all other dietary ingredients contained in the proprietary blend”. So the number beside the blend name is real and it covers everything inside.

What it does not require

The amount of each individual ingredient.

That is the whole gap, and it is worth stating precisely because vagueness here helps nobody. A blend listed as 500 mg containing five botanicals is compliant whether it is 100 mg of each or 460 mg of the first and 10 mg of the other four.

What you can still work out

More than you might think.

Position tells you something. Descending order is enforced, so the first ingredient dominates. If the substance you actually want is fifth in a five-item blend, there is not much of it.

The total constrains everything. A blend totalling 200 mg cannot contain a clinically studied 500 mg dose of anything. This is the most useful check available and it takes one glance: compare the blend total against the dose the ingredient is usually studied at.

A short blend is more informative than a long one. Two ingredients in 500 mg leaves less room to hide than nine.

Why manufacturers use them

The stated reason is protecting a formula from being copied. That is a genuine commercial concern and it is not, by itself, dishonest.

The other reason is that a blend lets a formula carry an impressive list of recognisable ingredients while spending money on very few of them. Both things are true at once, and the label does not distinguish between a company protecting a recipe and one padding a list.

The practical read

Blends are not a reason to reject a product outright. They are a reason to check the total against the dose you were expecting, and to treat anything near the end of a long list as decorative.

Where a product does declare every amount individually, that is a real signal. It costs the manufacturer some secrecy and they chose to spend it, which usually means the numbers hold up.