Ascorbyl Glucoside is a stable, water-soluble derivative of Vitamin C conjugated with a glucose molecule. It functions as a precursor that undergoes enzymatic conversion on the skin to release pure ascorbic acid, providing sustained antioxidant protection and brightening effects without the instability or irritation common to pure L-ascorbic acid.
- INCI Name:
- Ascorbyl Glucoside
- Chemical/Scientific Name:
- 2-O-alpha-D-glucopyranosyl-L-ascorbic acid
- Common Aliases:
- AA2G, Vitamin CG, C-Glucoside
| Category: | Antioxidants |
| Source Origin: | Biotechnological (synthetic conjugation of glucose and ascorbic acid) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetic, Dermatological |
| Solubility: | Water |
At a Glance: Properties & Effects
| Brightening/Tone: | |
| Anti-Aging/Renewal: | |
| Formula Stability: | |
| Irritation Risk: |
- Primary Benefits:
- Provides prolonged antioxidant activity by neutralizing free radicals generated by UV exposure.
- Inhibits tyrosinase activity to reduce melanin synthesis and lighten hyperpigmentation.
- Promotes collagen synthesis in fibroblasts to improve skin elasticity and reduce fine lines.
- Maintains structural integrity in water-based formulas at a physiological pH of 5.0 to 7.0.
- Potential Risks:
- Low risk of mild stinging if used in very high concentrations on compromised skin barriers.
- Efficacy is dependent on the skin’s enzymatic capacity to cleave the glucose bond.
Biological Action & Cosmetic Profile
The molecular structure of this ingredient features a glucose molecule attached to the C2 hydroxyl group of Ascorbic Acid. This specific linkage shields the Vitamin C from oxidative degradation caused by heat, light, and air, which typically destabilizes pure L-ascorbic acid. Once applied to the skin, the membrane-bound enzyme alpha-glucosidase gradually hydrolyzes the bond. This process facilitates a “time-release” delivery system, ensuring a consistent supply of active Vitamin C reaches the deeper epidermal layers over several hours.Intracellularly, the released Ascorbic Acid acts as a co-factor for prolyl and lysyl hydroxylases, the enzymes responsible for stabilizing the collagen triple helix. Furthermore, it interferes with the melanogenesis pathway by inhibiting the enzyme tyrosinase and reducing dopaquinone. Clinical evaluations via PubMed demonstrate that this derivative effectively improves skin radiance and reduces the appearance of age spots while maintaining a significantly better safety profile than acidic Vitamin C serums.
Broader Applications & Origins
Dermatologists frequently recommend this derivative for patients who cannot tolerate the low pH (usually below 3.5) required for pure Ascorbic Acid. Because Ascorbyl Glucoside remains stable at a near-neutral pH, it integrates seamlessly into various product formats including lightweight essences, gels, and creams. Its manufacturing involves an enzymatic process where a glucose molecule is transferred to the ascorbic acid molecule, a technique originally developed to enhance the shelf-life of antioxidant ingredients in the Japanese cosmetic market.
Routine Integration
- Synergies:
- Niacinamide: Enhances brightening effects and strengthens the skin barrier.
- Tocopherol & Ferulic Acid: Creates a comprehensive antioxidant network to fight photoaging.
- Sodium Hyaluronate: Supports hydration while the Vitamin C derivative works on tone.
- Conflicts:
- No known severe contraindications; however, staggering application with high-strength Retinol may be preferred for exceptionally sensitive skin types to minimize any potential for cumulative irritation.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel and CosIng database classify Ascorbyl Glucoside as a safe and non-sensitizing cosmetic ingredient. Toxicological data indicates no evidence of phototoxicity or mutagenicity. Research suggests it is well-tolerated at concentrations ranging from 0.5% to 5%, with many commercial formulations utilizing approximately 2% for optimal brightening results. Its high stability ensures that the product remains active throughout its shelf life, reducing the risk of pro-oxidant effects associated with oxidized Vitamin C products.
Is Ascorbyl Glucoside as effective as pure Vitamin C?
While pure Ascorbic Acid is more potent in its immediate action, Ascorbyl Glucoside is superior in stability and gentleness. It provides comparable long-term brightening and collagen-stimulating benefits through its sustained-release mechanism without the risk of irritation or rapid oxidation.
Can I use this ingredient during the day?
Yes, this ingredient is ideal for daytime use. It provides essential antioxidant protection against free radicals and environmental pollutants, making it an excellent companion to broad-spectrum sunscreens.
Does it work for acne-prone skin?
Ascorbyl Glucoside is non-comedogenic and has anti-inflammatory properties. It is frequently used to treat post-inflammatory hyperpigmentation (PIH) left behind by acne lesions without clogging pores or exacerbating breakouts.