Other high-potency L-Ascorbic Acid serums (e.g., SkinCeuticals C E Ferulic)

Exfoliating Acid Toners (e.g., PIXI Glow Tonic - Glycolic Acid, Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant - Salicylic Acid) [Note: It's best to use these on alternate nights, not simultaneously].

Direct acids like AHAs/BHAs in high concentrations (e.g., The Ordinary AHA 30% + BHA 2% Peeling Solution)

Niacinamide + Strong Direct Acids (e.g., Glycolic Acid, Lactic Acid, Citric Acid, Salicylic Acid): Using them together at a very low pH can cause flushing and irritation for some. It is safer to separate their use (AM/PM).

Pure Vitamin C (L-Ascorbic Acid) + Pure Niacinamide: This is an outdated concern. Modern formulations have shown they can be stable and effective together, as proven by this very product. The key is the specific formulation and pH level.

Vitamin C + Retinol: They are most effective at different pH levels and can be irritating when applied simultaneously. Use Vitamin C in the morning and retinol at night.

13% Pure L-Ascorbic Acid (Vitamin C)

Formulated with Niacinamide (Vitamin B3)

Infused with Centella Asiatica for calming

Lightweight, fast-absorbing serum texture

Packaged in an opaque airless bottle to prevent oxidation

Free of parabens, sulfates, and phthalates