Dr. Brenner Vitamin C Serum 20% L‑Ascorbic Acid for Face & Eyes 1 oz — Ferulic Acid + Hyaluronic for Brightening & Anti‑Aging

Dr. Brenner Vitamin C Serum is a 20% pure L-ascorbic acid skincare serum blended with ferulic acid, vitamin E and hyaluronic acid to brighten skin, support firmness and reduce signs of aging.

This potent facial serum combines a high concentration of pure vitamin C (L-ascorbic acid) with supportive antioxidants and a hydrating hyaluronic base. It is produced frequently to preserve activity, and the clear-to-slightly-yellow color reflects natural variation in the vitamin C and vitamin E ingredients. The formula is offered in a 1 oz bottle and is intended for topical use on face and eye areas to target dullness, uneven tone, and the appearance of fine lines.

How quickly will I notice brighter, more even skin?

Many users observe subtle improvements in skin brightness and tone within a few weeks, while more pronounced changes in texture and discoloration typically take 6–12 weeks with consistent use. Results depend on baseline skin condition, how often you apply it, and sun exposure.

• Apply once daily in the morning or evening after cleansing.
• Use daily sunscreen when using vitamin C topically for best results.
• Consistency is key—daily application increases visible benefits.

Will this serum irritate sensitive or reactive skin?

Because this product contains 20% pure L-ascorbic acid, it is a high-strength vitamin C formulation and may cause mild tingling or temporary redness for sensitive skin types. Start with every-other-day use and perform a patch test before applying to the whole face to gauge tolerance.

• Patch test on inner forearm for 24–48 hours before full use.
• Begin with lower frequency (every other day), then increase if tolerated.
• Layer with gentle moisturizers or apply over hyaluronic products to reduce irritation.

How should I incorporate this serum into my skincare routine?

Use after cleansing and toning but before heavier creams and oils so the active ingredients penetrate effectively. In the morning, follow with a broad-spectrum sunscreen; in the evening, you can layer moisturizing products after the serum absorbs.

• Cleanse, apply toner (optional), then 3–5 drops of the vitamin C serum.
• Allow 1–2 minutes to absorb before applying moisturizer and sunscreen.
• Avoid concurrent use with high-strength retinoids immediately—space applications if combining actives.

How is this product kept fresh and why does color vary?

Dr. Brenner manufactures this serum every two weeks to preserve potency; despite precautions, vitamin C and vitamin E can oxidize over time, producing a natural color shift from clear to slightly yellow. Check the expiration date on the label to ensure freshness and best activity.

• Produced biweekly to deliver active ingredients at peak potency.
• Natural color variation does not necessarily indicate spoilage—verify the expiration date.
• Store in a cool, dark place and keep the cap tightly closed to limit oxidation.

Who is this for: This Dr. Brenner Vitamin C Serum is suited for adults seeking a high-strength, antioxidant-rich topical to help brighten skin, improve visible firmness, and target fine lines. It is appropriate for those comfortable introducing a concentrated L-ascorbic acid product into a routine and willing to patch test if they have sensitive or reactive skin. If you want a fresh, science-backed vitamin C formulation combined with ferulic acid, vitamin E and hyaluronic acid, this serum offers a targeted option in a compact 1 oz format.

Ingredients

Ingredients: Water, Ethoxydiglycol, L-Ascorbic Acid (Vitamin C), Propylene Glycol, Glycerin, Laureth-23, Tocopherol (Vitamin E), Sodium Hyaluronate (Hyaluronic Acid ), Ferulic Acid, Panthenol, Triethanolamine, Phenoxyethanol.