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From recipe to jar

Updated October 2026

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One: is it for children, or for adults only?And if it is for children, you may add a phrase Two: substantiate the safety, per ingredient and per product Which is the part people skip Three: choose the container for moisture And the ingredient declaration Keep the three answers together The audience decision comes first for a reason References

Three decisions, and the first one is about the audience rather than the product.

One: is it for children, or for adults only?

For a foaming product that single decision settles whether the prescribed caution is required. Labeling for use exclusively by adults is the exemption, and it is a market decision rather than a wording one.

And if it is for children, you may add a phrase

For products intended for use by children the regulation permits "except under adult supervision" at the end of the last sentence of the caution. A small permission, and worth using where it fits.

Two: substantiate the safety, per ingredient and per product

Each ingredient and each finished product, before marketing. The alternative is a warning on the principal display panel saying the safety has not been determined, which is not an alternative any business would choose.

Which is the part people skip

Because it is work rather than wording, and because nothing stops you shipping without it except the misbranding consequence. Knowing the rule exists is most of the battle.

Three: choose the container for moisture

A liner that actually seals, a desiccant sized to the headspace, and a jar sized to the fill so there is little air in it. For a reactive product those three are the whole specification.

And the ingredient declaration

A cosmetic in package form carries its ingredients in descending order of predominance. On a small jar that competes for space with the caution and the directions, so the label has to be laid out rather than assembled.

Keep the three answers together

Audience, substantiation file, and the container and liner choice. Changing the audience changes the label; changing the formula reopens the substantiation and often the moisture behavior too.

The audience decision comes first for a reason

It is the only one of the three that changes which rule applies rather than how well you satisfy it. Formulating and then deciding who the product is for means designing a label twice.

References

21 CFR 740.17, Foaming detergent bath products, which defines such a product as anything intended to be added to a bath to produce foam that contains a surface-active agent serving as a detergent or foaming ingredient, and requires a prescribed caution and adequate directions for safe use except for products labeled as intended for use exclusively by adults. law.cornell.edu

21 CFR 740.10, which requires each ingredient and each finished cosmetic product to be adequately substantiated for safety prior to marketing, and makes an unsubstantiated ingredient or product misbranded unless it bears the conspicuous statement "Warning - The safety of this product has not been determined" on the principal display panel. law.cornell.edu

21 CFR 701.3, the cosmetic ingredient declaration, which requires ingredients in descending order of predominance on the label of a cosmetic in package form. law.cornell.edu

Written from federal regulation, not from a formulation bench. Substantiating the safety of a cosmetic is a real body of work and nothing here is a substitute for it. Whether a particular product is a foaming detergent bath product within 21 CFR 740.17 turns on what it is and what it is intended for.