Question 1

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

Accepted Answer

This ingredient is mainly used as a pH adjuster and buffering aid, helping formulas land in the right acidity range for skin feel, stability, and preservative performance. It can also lightly bind metal ions, which helps limit discoloration and oxidation in some systems.

Question 2

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

Accepted Answer

It is broadly accepted in clean-beauty frameworks and is generally well tolerated at pH-adjusting levels. In low-pH or exfoliating formulas, it can contribute to stinging on sensitive or compromised skin, but it has no major restricted-list friction.

Question 3

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

Accepted Answer

This ingredient is commonly made by fermentation of sugar-based feedstocks and is readily biodegradable. Its sustainability profile is generally strong, with the main variables being agricultural sourcing and fermentation inputs.

Question 4

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

Accepted Answer

It is permitted under COSMOS-natural and COSMOS-organic standards when produced and handled according to the standard. It fits Green Chemistry principles well because it can come from fermentation, works effectively at low levels, is water-compatible, and biodegrades readily.

Question 5

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

Accepted Answer

The molecule is a small, water-soluble alpha-hydroxy tricarboxylic acid with pKa values around 3.1, 4.8, and 6.4, which explains its buffering and metal-binding behavior. Typical use is about 0.05% to 0.5% for pH adjustment, with higher levels in exfoliating products, and it can shift viscosity, preservative efficacy, and skin feel by lowering formula pH.