Proprietary blends on US labels: the rules, the criticism, and how to do it right

Proprietary blends are legal on US supplement labels, widely used, and increasingly distrusted by informed buyers. For a manufacturer, the question isn't just whether you can use one — it's whether you should, and how to label it correctly when you do.

What a proprietary blend is

A proprietary blend is a combination of dietary ingredients listed on the Supplement Facts panel under a single blend name, with the total weight of the blend declared but not the amount of each individual ingredient. US rules allow this: the individual amounts may be withheld as a trade secret, provided the total blend weight is shown and ingredients are listed in descending order by weight.

What the rules still require

Even within a blend, ingredients must be listed in descending order of predominance by weight, and the total quantity of the blend must be declared. Allergens within the blend must still be disclosed, and the ingredients must still be lawful dietary ingredients. The blend hides the per-ingredient amounts, not the ingredients themselves.

Why buyers are skeptical

Proprietary blends draw criticism because they can hide 'fairy dusting' — including a trendy ingredient in a token amount too small to do anything, while cheaper fillers make up the bulk. Sophisticated consumers, retailers, and review sites increasingly penalize blends for this opacity, and transparency has become a competitive advantage.

The transparency trade-off

Using a blend protects a formula but can cost trust; full disclosure builds trust but reveals the recipe. Many brands now choose full transparency deliberately. Whichever path a manufacturer takes, the labeling has to be correct — and being able to switch between a disclosed panel and a blended one cleanly is a practical formulation-management need.

This is general information, not regulatory or legal advice. US requirements change and turn on specifics, so confirm the current rules with the FDA, FTC, or a qualified US regulatory expert before relying on them.

Where Lemoniq fits

Lemoniq holds each product as one structured formula — ingredients, amounts, specifications, sourcing, and the documentation behind them — and generates what a US dietary supplement label needs from that single source: the Supplement Facts panel, the claim and disclaimer wording, the records that cGMP expects, and the data to back overages, dating, and origin. Compliance becomes a property of the formula, not a pile of separate documents.

The takeaway

The US supplement model trades pre-market approval for full manufacturer responsibility, which means the work shifts onto documentation, accurate labeling, and defensible formulas. The brands that scale in the US are the ones whose single source-of-truth formula generates each label, specification, and record correctly — every time, across every product.

Lemoniq turns one formula into compliant, US-ready outputs — panel, claims, specs, and documentation — from a single source. We solve this exact problem. See how it works