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Moumoujus

ASCORBIC ACID.

Essential CAS 50-81-7 / 62624-30-0 / ANTIOXIDANT, BUFFERING, FRAGRANCE, SKIN CONDITIONING

Ascorbic Acid, a pure form of Vitamin C, is a multi-functional active renowned for its potent antioxidant properties. It is instrumental in fostering collagen synthesis and effectively addressing hyperpigmentation, leading to a visibly brighter, more even, and firmer complexion.

Summary

antioxidant buffering masking skin conditioning

Science

Mechanism of Action

Ascorbic Acid acts as a powerful antioxidant by efficiently neutralizing free radicals, thereby shielding the skin from oxidative stress and environmental damage caused by UV radiation and pollutants. It serves as a crucial co-factor for enzymes essential in collagen synthesis, stabilizing the collagen triple-helix structure to promote new collagen production, which ultimately enhances skin firmness and elasticity. Additionally, it contributes to depigmentation and skin brightening by inhibiting melanogenesis through the reduction of dopaquinone and interference with tyrosinase activity, effectively diminishing dark spots and hyperpigmentation. This ingredient also supports epidermal health by promoting keratinocyte differentiation and optimizing the organization of barrier lipids for a healthier skin surface.

Research

Clinical Evidence

High confidence
Effective range 5–15%
Optimal

10%

Key findings

  1. 01 Demonstrates effectiveness and excellent tolerability across most skin types, achieving an optimal balance between desired outcomes and minimal irritation.
  2. 02 Identified as the optimal concentration range for individuals with sensitive skin.
  3. 03 Required as a minimum threshold for a product to elicit a desired biological effect in the skin.
  4. 04 Proven effective in treating melasma in a double-blind randomized clinical trial.
  5. 05 Significantly reduced pigmentation associated with melasma over a 16-week period in a topical formulation, though concentrations exceeding 20% do not typically enhance activity and may increase irritation.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
8%
Red flag below
8%

Clinical data indicates that Ascorbic Acid requires a concentration exceeding 8% to exert a desired biological effect on the skin. Formulations with concentrations below this threshold are unlikely to deliver significant active benefits, potentially functioning more as auxiliary agents than primary active treatments for antioxidant, collagen-boosting, or brightening claims.

The Formula

Formulation

Solubility
Water
Optimal pH 2 – 3.5
0 7 14

Stability

Ascorbic Acid is highly unstable and prone to rapid oxidation when exposed to light, air, and heat. Aqueous solutions are only stable in the complete absence of oxygen and degrade considerably in the presence of transition metal ions, particularly Cu2+ and Fe3+. Achieving optimal stability and ensuring adequate skin permeability in aqueous formulations necessitates a pH environment below 3.5.

Conflicts

  • Niacinamide: Due to significant pH incompatibility, potentially diminishing the efficacy of both ingredients.
  • AHAs/BHAs (e.g., Glycolic, Salicylic, Lactic Acids): May lead to increased skin irritation and compromise Ascorbic Acid's stability.
  • Retinoids/Retinol: Often advised against co-application to avoid potential reduction in effectiveness or heightened skin irritation.
  • Benzoyl Peroxide: A strong oxidizing agent capable of deactivating Ascorbic Acid and other active ingredients.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
17%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed the safety of Ascorbic Acid for use in cosmetic and personal care products, noting it is not genotoxic in its antioxidant capacity. The FDA lists Ascorbic Acid as Generally Recognized as Safe (GRAS) as both a preservative and nutrient supplement. While the SCCS has recently raised concerns regarding some vitamin C derivatives, these conclusions do not directly pertain to pure Ascorbic Acid. The maximum reported concentration for Ascorbic Acid in cosmetics increased to 17% in skin fresheners in 2023.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Essential

As a powerful multi-tasking antioxidant, collagen booster, and brightener, Ascorbic Acid is an essential ingredient for comprehensive skin health and rejuvenation.

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