What should you know about Obagi Professional-C L-Ascorbic Acid?

L-ascorbic acid is a form of vitamin C applied to the skin. It provides antioxidant activity and may support a more even-looking tone when used alongside sun protection. A higher-strength formula can feel more active, especially if your skin is dry, sensitive, or already using exfoliating or prescription products.

Stinging, redness, dryness, or flaking can occur with topical actives. The serum is cosmetic care, not a diagnosis or a substitute for evaluation of a new rash, persistent dark patch, or changing lesion. Vitamin C Serum is a broader guide to this ingredient and how it fits into a routine.

Follow the directions provided by your clinician or the product label. Apply to clean, dry skin as advised, then use moisturiser and daytime sunscreen. Start less often if instructed, and avoid applying it to broken or freshly irritated skin. Keep the container closed and stored as directed because light, air, and heat can affect active formulas.

Do not add several strong exfoliants, retinoids, or pigment treatments at the same time without professional guidance. If the serum causes ongoing burning or visible irritation, pause it and ask a clinician how to simplify your routine.

Stop using the serum and seek medical advice for facial swelling, hives, blistering, severe burning, or eye exposure that does not settle after rinsing. Arrange assessment for a persistent rash or a dark or pale patch that changes independently of product use.

Ask whether this strength suits your skin, which products should be separated from it, how often to begin, and what reaction is expected. Mention eczema, rosacea, allergies, pregnancy plans, and any prescription creams before starting a strong active.