Dry Shampoo Notifications for Aerosol and Powder Formats

Two makers can sell what is essentially the same dry shampoo, rice starch, kaolin clay, a bit of arrowroot, cocoa powder for the darker shade, and end up with quite different filings depending on whether one puts it in an aerosol can and the other in a shaker jar. The active powder blend might be nearly identical. The delivery format is what changes what you need to think through.

The powder version is the simpler case

A loose or pressed powder dry shampoo in a shaker jar or a compact is, ingredient-wise, close to filing any powder cosmetic. You list every ingredient by INCI name with its concentration, same as always. The main things that trip people up:

• Cornstarch, rice starch, and clays are cosmetic ingredients when used for oil absorption, and get listed like anything else. There is no special exemption for "it's just starch."
• Fragrance, if added, gets treated the same as fragrance in any leave-on product, including the fragrance allergen disclosure rules that apply in Canada from 2026 onward. Powder dry shampoos are absolutely a leave-on product, so the lower disclosure threshold (above 0.001% concentration) applies, not the rinse-off threshold.
• Color, if you use cocoa powder or a cosmetic-grade iron oxide to tint the powder for darker hair, gets listed as a colorant ingredient like any pigment.

Aerosol changes the picture in two ways

Putting the same powder into a pressurized aerosol can adds two considerations that a shaker jar does not have.

First, the propellant is an ingredient. Aerosol dry shampoos typically use a hydrocarbon propellant (butane, isobutane, propane blends are common in this category) to push the powder out of the can. That propellant is part of your formula and gets listed on the notification and the label like any other ingredient, at its actual concentration in the finished pressurized product. It is easy to treat the propellant as "packaging" and forget it belongs on the ingredient list. It does not belong on the outside of the can as a footnote. It belongs in the formula.

Second, inhalation exposure becomes a real safety consideration, separate from the skin-contact safety substantiation you would already be doing for a topical cosmetic. Aerosolizing a fine powder means some of it becomes airborne and gets inhaled, at least in small amounts, during normal use. This is part of why aerosol personal care products generally carry cautionary label language about avoiding inhalation and using in a ventilated area. If your safety assessment or your supplier documentation has not considered inhalation exposure specifically, that is a gap worth closing before you sell an aerosolized version, separate from whatever cosmetic notification filing you do.

Comparing the two at a glance

Consideration	Loose/pressed powder	Aerosol spray
Propellant as an ingredient	Not applicable	Yes, list and quantify it
Fragrance allergen threshold	Leave-on (0.001%)	Leave-on (0.001%)
Inhalation exposure review	Minimal, powder is applied by hand or brush	Meaningful, product is aerosolized by design
Label cautions	Standard cosmetic cautions	Typically includes inhalation and flammability cautions
Packaging regulation overlap	None beyond standard cosmetic labeling	May intersect with pressurized container and flammability rules depending on your market, which sit outside cosmetic notification specifically

Flammability is a packaging issue, not a cosmetic ingredient issue, but it still matters

Hydrocarbon propellants are flammable. Depending on where you are selling and shipping, aerosol products with flammable propellants can trigger separate transport and hazardous materials handling rules that have nothing to do with your cosmetic filing but everything to do with how you can legally ship the finished can. This is worth a conversation with your packaging supplier or a shipping compliance resource before you commit to an aerosol format, since it affects your logistics costs as much as your regulatory ones.

What stays the same either way

Regardless of format, you are still filing the same kind of Cosmetic Notification Form in Canada, within 10 days of first sale, listing every ingredient by INCI name with concentration, and checking each one against the Cosmetic Ingredient Hotlist. The format does not exempt you from any of that. It just adds propellant disclosure and an inhalation-aware safety review on top, for the aerosol version specifically.

If you are deciding between formats for a new dry shampoo launch, it can help to run the ingredient list through Cosmetic Comply first. It will map your powder actives and, separately, your propellant if you go the aerosol route, to their INCI names and check both against the Hotlist, so you can see the full filing picture before you commit to a can versus a jar.