Obagi Medical Professional-C Serum 20% Vitamin C Facial Serum, 1 fl oz — Lightweight, Fast-Absorbing for Normal to Oily Skin

Obagi Professional-C Serum 20% is a high-strength L-ascorbic acid facial serum formulated to support smoother-looking skin texture and a more even tone.

This concentrated 20% vitamin C formula from Obagi Medical is designed for people with normal to oily skin who want a potent antioxidant topical treatment. The serum uses a superior delivery system to help the active ingredient penetrate the skin and supports resilience and hydration without heavy oils. Its lightweight, fast-absorbing finish makes it easy to layer under sunscreen or makeup in morning routines, while targeted nightly use can complement existing regimens.

How does this 20% vitamin C serum fit into my daily routine?

Apply a few drops after cleansing and toning, before moisturizer and sunscreen in the morning, or at night in place of or before your moisturizer depending on tolerance. Start gradually if you’re new to high-concentration vitamin C to minimize irritation. Pairing with a broad-spectrum sunscreen is recommended when using antioxidant serums during daytime.

• Use 2–3 drops per application to cover face and neck.
• Start every other day, then increase to daily as tolerated.
• Layer under moisturizer and SPF for daytime protection.

What skin concerns can this serum help address?

The formulation aims to improve the look of uneven tone and texture while supporting skin’s natural defenses against daily environmental stressors. Because it’s L-ascorbic acid at a high concentration, it targets surface irregularities and provides a brightening effect over time. Results depend on consistent use and complementary skincare habits.

• Helps reduce the appearance of skin discoloration and uneven tone.
• Supports smoother-looking texture and hydrated-feeling skin.
• Designed to enhance collagen-supporting pathways for firmer appearance.

Is Obagi Professional-C Serum 20% suitable for sensitive or oily skin?

This serum is formulated to be suitable for a range of skin types, including normal to oily, and the product information indicates compatibility with sensitive or reactive skin when used appropriately. People with high sensitivity should patch-test first and introduce the product slowly. If irritation occurs, reduce frequency or consult a skincare professional.

• Lightweight, non-greasy texture works well for oilier skin types.
• Patch-test on inner wrist or jawline before full-face use.
• Reduce use frequency if redness or stinging appears.

How should I store and handle a concentrated vitamin C serum?

Vitamin C serums are best kept in cool, dark places to preserve potency; many come in opaque or amber bottles to reduce light exposure. Close the bottle tightly after each use and avoid leaving it in direct sunlight or high heat. If the serum changes color significantly or develops a strong odor, replace it to ensure effectiveness.

• Keep bottle tightly sealed and store away from heat and light.
• Use within the recommended period after opening to maintain strength.
• Discard if color or scent changes markedly.

Who is this for: Obagi Professional-C Serum 20% suits adults seeking a potent topical antioxidant to support more even skin tone and improved texture, especially those with normal to oily skin who can tolerate a concentrated L-ascorbic acid formulation. It is a fit for users who want a fast-absorbing serum to layer under sunscreen and moisturizer, and for anyone building a targeted daytime antioxidant step into their skincare routine. If you have very reactive skin, consult a dermatologist or introduce the product slowly with patch testing.

Ingredients

Propylene glycol, water, L-ascorbic acid, alcohol, ascorbyl glucoside, ethoxydiglycol, phenoxyethanol, sorbitol, sodium hyaluronate, zinc chloride, calcium hydroxide, fragrance