L-Ascorbic Acid (Topical Vitamin C)
L-Ascorbic Acid (Topical Vitamin C)
L-A
7/10
Concern level
High concern
Vitamin C Compound
L-ascorbic acid is the biologically active form of vitamin C used in topical skincare. It functions as a potent antioxidant and brightening active, helping reduce the appearance of dullness, uneven tone, and photoaging while supporting collagen-related benefits. It is highly water-soluble but chemically unstable, so effective formulas usually require low pH and protective packaging.
Pore-clogging
Non-comedogenic
Pregnancy
Safe
Regulatory
No data
Benefits
Anti-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: strong exfoliating acids (AHA/BHA) if skin is sensitive or compromised, retinoids if irritation occurs, benzoyl peroxide, oxidized or unstable formulas
Risks & Warnings
Can cause stinging, redness, dryness, or barrier disruption, especially at low pH or higher concentrations. Oxidized products lose potency and may be more irritating. Caution is warranted for very sensitive, compromised, or rosacea-prone skin.
Vegan Cruelty-Free
