3-O-Ethyl Ascorbic Acid (3-O-Ethyl Ascorbic Acid) - antioxidant, skin protectant, conditioning

INCI Name

3-O-Ethyl Ascorbic A...

Functions

3 Roles

Sustainability

7/10

What It Does

3-O-Ethyl Ascorbic Acid is a stabilized, lipophilic derivative of L-ascorbic acid (vitamin C) created by attaching an ethyl group at the 3-position of the ascorbic acid molecule. This modification makes it significantly more stable than pure vitamin C, resistant to oxidation, and soluble in both water and oil phases, allowing it to penetrate skin more effectively without requiring extremely low pH formulations. Formulators favor this derivative because it remains active at physiological pH levels (around 5-7), doesn't cause the irritation associated with pure ascorbic acid, and converts to active vitamin C within the skin through enzymatic action, providing brightening, collagen synthesis support, and antioxidant protection without the formulation challenges of traditional L-ascorbic acid.

Neutralizes damaging free radicals

Protects skin from environmental stress

Prevents formula oxidation

Supports anti-aging benefits

Technical Properties

pH Range

4.0-7.0

Optimal working range

Ionic Charge

nonionic

Molecular charge type

Viscosity Effect

neutral

Impact on formula thickness

Ingredient Compatibility

Known Interactions

BENZOYL PEROXIDEIncompatibleOxidation

Benzoyl Peroxide oxidizes L-Ascorbic Acid, rendering both ingredients inactive. These must never be combined.

HYDROGEN PEROXIDEIncompatibleOxidation

Hydrogen Peroxide rapidly oxidizes Ascorbic Acid, deactivating both. Strong oxidizer + antioxidant neutralization.

COPPER PEPTIDEIncompatibleChelation

Ascorbic Acid reduces Cu2+ to Cu1+, deactivating copper peptides and generating free radicals via Fenton-like reactions. These must not be combined.

COPPER TRIPEPTIDE-1IncompatibleChelation

Ascorbic Acid reduces Cu2+ in GHK-Cu to Cu1+, deactivating the peptide complex and generating reactive oxygen species. Never combine in the same formulation.

NIACINAMIDEUse CautionpH Conflict

Niacinamide and L-Ascorbic Acid can interact at low pH, potentially forming nicotinic acid (causes flushing). They work optimally at different pH ranges (Niacinamide pH 5-7, Ascorbic Acid pH 2.5-3.5). Consider using a Vitamin C derivative stable at higher pH, or separate products.

RETINOLUse CautionpH Conflict

Retinol and L-Ascorbic Acid both require low pH but Retinol is unstable in acidic conditions. Using both in the same formula reduces efficacy of both actives. Separate into AM (Vitamin C) and PM (Retinol) products.

CYANOCOBALAMINUse CautionDegradation

Ascorbic Acid can degrade Cyanocobalamin (Vitamin B12) in solution, converting it to inactive analogues. In liquid/gummy formulations, use Methylcobalamin or separate the vitamins. Tablet/capsule forms are less affected.

SODIUM BENZOATEUse CautionDegradation

Ascorbic Acid + Sodium Benzoate can form benzene (a carcinogen) in acidic conditions with heat or UV exposure. This is a well-documented FDA concern in beverages. Use alternative preservatives or ensure pH > 4 and avoid metal catalysts.

SODIUM HYALURONATENotepH Conflict

Sodium Hyaluronate may thin in viscosity at the low pH required for L-Ascorbic Acid (pH < 3.5). Consider using a lower molecular weight HA or a Vitamin C derivative stable at higher pH.

IRON OXIDESNoteDegradation

Iron from iron oxide pigments can catalyze oxidation of Ascorbic Acid via Fenton reaction. Not a concern at typical pigment levels in tinted products, but avoid high concentrations of both.

ARBUTINNotepH Conflict

Arbutin is most stable and effective at pH 5-7, while L-Ascorbic Acid requires pH 2.5-3.5. Combined use forces a pH compromise that reduces efficacy of one or both. Use an Ascorbic Acid derivative if combining.

THIAMINENoteDegradation

Ascorbic Acid can accelerate Thiamine (B1) degradation in solution at acidic pH. In liquid supplements, this can reduce B1 potency over shelf life. Dry forms are unaffected.

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