Erythorbic Acid
What is Erythorbic Acid?
Erythorbic acid is a six-carbon sugar acid, chemically known as D-erythro-3,4-dihydroxy-5-hydroxytetrahydro-2H-pyran-2-carboxylic acid, produced via bacterial fermentation of plant sugars like corn dextrose. It closely resembles ascorbic acid in structure but features the opposite configuration at the C-5 position, making it biologically inactive as vitamin C. Primarily categorized as a preservative and stabilizer in rinse-off and leave-on cosmetics such as lotions, serums, shampoos, and foundations, it operates by donating electrons to free radicals and chelating metal ions that catalyze oxidation. This mechanism halts chain reactions that degrade unsaturated fats, essential oils, and colorants, preserving formula integrity, preventing off-odors, and ensuring consistent performance over time. Though occasionally contributing to scent masking, its core role focuses on formulation protection rather than direct skin interaction.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Stabilizes sensitive ingredients against oxidative breakdown for longer product freshness.
Minimizes rancidity in oil-containing formulas, supporting consistent texture and scent.
Helps preserve color vibrancy and overall efficacy throughout shelf life.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Users of oil-rich or fragrance-heavy products seeking reliable stability. | Those with confirmed rare hypersensitivity to sugar-derived acids. |
| Individuals preferring low-hazard preservatives in daily skincare routines. | Users preferring completely preservative-free formulations. |
| People with formulas prone to degradation in humid or warm storage conditions. | Individuals sensitive to structurally similar ascorbic acid derivatives. |
Safety Notes
- Deemed safe for cosmetic use by regulatory reviews with low irritation potential.
- Typically non-comedogenic and suitable across skin types when used as directed.
Frequently Asked Questions about Erythorbic Acid
What is erythorbic acid used for in skincare?
It functions mainly as an antioxidant to prevent oxidation, extending shelf life and maintaining product quality.
Is erythorbic acid the same as vitamin C?
No, it is an inactive stereoisomer of ascorbic acid used for stabilization, not skin vitamin benefits.
Is erythorbic acid safe for sensitive skin?
Yes, it has a low hazard rating and minimal irritation potential based on safety assessments.