Question 1

What does Hydroxystearic Acid. May Contain: Iron Oxides (CI 77491 do in a cosmetic formula?

Accepted Answer

This ingredient is primarily used as a fatty structurant and texture modifier, helping thicken oils, stabilize emulsions, and add body to sticks, balms, creams, and color cosmetics.

Question 2

Is Hydroxystearic Acid. May Contain: Iron Oxides (CI 77491 clean?

Accepted Answer

From a clean-beauty perspective, this ingredient is generally well tolerated and has little restricted-list friction when cosmetic-grade purity is used. The possible mineral pigment component is also widely accepted when it meets heavy-metal purity limits for color additives.

Question 3

Is Hydroxystearic Acid. May Contain: Iron Oxides (CI 77491 sustainable?

Accepted Answer

This material is commonly derived from plant-based fatty feedstocks, often castor-related supply chains, though sourcing practices can vary. It is expected to biodegrade like many long-chain fatty acids and is not known for environmental persistence.

Question 4

Is Hydroxystearic Acid. May Contain: Iron Oxides (CI 77491 COSMOS-approved?

Accepted Answer

It is generally compatible with COSMOS-natural and COSMOS-organic formulas when sourced and processed through permitted routes, with organic status depending on the feedstock. It aligns reasonably well with Green Chemistry because it can come from renewable oils, has a simple fatty-acid structure, and does not require highly persistent chemistry.

Question 5

How does Hydroxystearic Acid. May Contain: Iron Oxides (CI 77491 work chemically?

Accepted Answer

The molecule is a hydroxylated C18 fatty acid, so it combines a long hydrophobic chain with both acid and alcohol functionality, giving it strong structuring and oil-gelling behavior. It is typically stable in anhydrous and emulsion systems, can form soaps or salts at higher pH, and is often used at low single-digit levels for texture or higher levels in solid formats.