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It is also used to make a product more thick.

The FDA requires batch-to-batch certification for this ingredient that is held to a pretty rigorous standard. That means the CI 17200 in your cosmetics has been tested and approved before it ever reaches you.

Contact allergy to cosmetic-grade dyes used at low concentrations are uncommon but has been documented before.

This ingredient also goes by the name D&C RED NO. 33.

CI 17200 has a comedogenic rating of 1 and an irritancy rating of 2 on a scale of 0-5. This is based on peer-reviewed research from the man who invented the comedogenic scale.

A 1 on the comedogenic scale is about as low as it gets without being a flat zero, and makes sense for CI 17200.

It's a water-soluble dye used at very small concentrations (typically 0.001-0.1%), so it dissolves into the water phase of a formula rather than sitting on your skin the way an oil or wax would.

The irritancy rating of 2 reflects that, like most synthetic dyes, there's a small possibility of mild irritation ( particularly for people with existing dye sensitivities).

For the vast majority of people, it's a non-issue at typical use levels.

It's also worth keeping in mind that comedogenic and irritancy ratings are tested on individual ingredients, not finished formulas. The final product's formulation, concentration, and other ingredients all play a role in how something actually behaves on your skin.

Just so you know, the FDA ban on Red Dye No. 3 refers to CI 45430, not this ingredient. CI 45430 and CI 17200 are different chemical compounds with distinct safety and regulatory histories.

It's also worth noting that Red No. 3 (CI 45430) was already banned from cosmetics back in 1990, so the 2025 action just extended the ban to food and oral drugs. CI 17200 was never part of any of this.

On concentrations, neither the EU nor the FDA sets a hard number. The EU allows it with purity limits on leftover manufacturing residues and the FDA allows it in externally applied cosmetics at levels consistent with batch-certified good manufacturing practice.

Industry reports around 0.5% concentration usage in leave-on products, but most products use far less because it's a pretty strong dye.

The one rule that both regions share is that it isn't allowed anywhere it would touch mucous membranes (so no lipstick or eye products).

That restriction comes from an unresolved 2005 EU data request on how much of the dye penetrates skin and breaks down there, and not from any reported consumer harm.

Allergy risk is low and a guinea pig study ranked it a much weaker sensitizer than common hair-dye chemicals. But the same study found animals sensitized to paraphenylenediamine sometimes cross-reacted to it, so it's worth flagging for a patch test if you have a known permanant-hair-dye allergy.