L-Ascorbic Acid
L-Ascorbic Acid
L-A
8/10
Concern level
High concern
Vitamin C Compound
L-Ascorbic Acid is the biologically active, water-soluble form of vitamin C used in skincare for antioxidant protection, brightening, and support of collagen synthesis. It is the most potent topical vitamin C form, but also the least stable and typically requires low-pH formulation for meaningful skin delivery.
Pore-clogging
Non-comedogenic
Pregnancy
Safe
Regulatory
No data
Benefits
Boosts Collagen ProductionAnti-agingBrightening
Chemical Properties
Molecular Weight
176.12 g/mol pH Range
2.50 - 3.50Typical Concentration
5.00% - 20.00%CAS Number: 50-81-7
Skin Type Compatibility
dry skin6/10
oily skin8/10
sensitive skin4/10
acne prone7/10
mature skin9/10
normal skin8/10
Interactions
incompatible with: benzoyl peroxide, strong exfoliating acids, high-pH or alkaline formulations, layering with multiple strong actives in one routine may increase irritation
Risks & Warnings
Can cause stinging, redness, dryness, and barrier disruption, especially at low pH or higher concentrations. It oxidizes readily with exposure to air, light, heat, and alkaline conditions, which can reduce efficacy. Sensitive or compromised skin may tolerate it poorly.
Vegan Cruelty-Free
