Obagi Professional-C® Serum 10% Review

Obagi Professional-C® Serum 10% is the entry-strength serum in Obagi's three-strength vitamin C range, built around 10% L-Ascorbic Acid at a level Obagi formulates specifically for dry, sensitive and reactive skin. It's the starting point Obagi's own product guidance points first-time vitamin C users toward, rather than a diluted version of something you'll quickly outgrow.

What is Obagi Professional-C Serum 10%?

This is a 30ml fluid-texture serum from Obagi's Professional-C line, formulated around L-Ascorbic Acid — widely regarded as the most researched and most bioavailable form of vitamin C used in skincare — at a 10% concentration. Obagi's own product description positions it as a dermatologist-recommended option formulated at pH levels intended to support the stability, skin permeability and efficacy of the L-Ascorbic Acid, aimed at delivering antioxidant protection without the irritation that higher vitamin C strengths can bring for reactive skin.

It sits at the gentle end of Obagi's Professional-C strength ladder, alongside Professional-C Serum 15% and Professional-C Serum 20% — all three share the same headline active, just at different concentrations.

Key ingredients

• L-Ascorbic Acid (10%) — the serum's sole headline active, an antioxidant vitamin C form that helps defend against free radical damage from UV and environmental exposure, and helps improve the appearance of dullness, uneven tone and fine lines with consistent use
• Propylene Glycol — a humectant and solvent included to help support the serum's texture and skin permeability
• Propylene Carbonate — a supporting solvent ingredient that helps stabilise the L-Ascorbic Acid formulation
• Parfum (fragrance) — the formula lists a fragrance ingredient; worth checking if you're fragrance-sensitive or fragrance-avoidant

Who it's for

• Anyone who hasn't used a leave-on vitamin C serum before
• Dry, sensitive or reactive skin that hasn't tolerated higher-strength vitamin C elsewhere
• Skin dealing with dullness, uneven tone or early signs of environmental damage
• Anyone wanting a gentler way to build tolerance before stepping up in strength

It's a less obvious fit for skin that's already comfortable with a daily vitamin C routine and wants more visible brightening — Professional-C 15% or 20% are the strengths built for that instead.

How to use it

Vitamin C serums are conventionally used as a morning step, applied to cleansed, dry skin before moisturiser and daily SPF — vitamin C works alongside sunscreen rather than replacing it. A slight tingling sensation on first use is common with L-Ascorbic Acid formulas and typically settles with continued use; if irritation is significant or doesn't ease off, pause use and seek advice. DATA GAP: Obagi's exact published directions and build-up guidance specific to the 10% strength weren't independently re-confirmed against a live metafield pull in this session, so we're deliberately not stating a precise application frequency here — check the product packaging or ask our team before starting.

Professional-C 10% vs 15% vs 20%: which to choose

All three Professional-C strengths use the same L-Ascorbic Acid active — the difference is concentration, not formula. Professional-C 10% is the one to start with if you're new to vitamin C or lean sensitive; 15% is a reasonable step up once your skin has adjusted; 20% is Obagi's maximum-strength option, best reserved for vitamin-C-experienced skin. Our full Professional-C 10% vs 15% vs 20% comparison goes through exactly what changes between the three and how to judge when to move up.

Other Obagi vitamin C options

If pigmentation and uneven tone specifically are your main concern rather than antioxidant strength alone, Obagi also makes Obagi-C® Fx C-Clarifying Serum, which pairs L-Ascorbic Acid with Arbutin as a second brightening active. For a fuller comparison of everything in Obagi's vitamin C range — including where the plain Professional-C strengths fit against the dual-active option — see our best Obagi vitamin C serum guide. If you're comparing vitamin C serums across every brand Skintique stocks rather than staying inside the Obagi range, our wider guide to the best vitamin C serums in the UK covers that ground instead. For the wider Obagi range, see our Obagi brand overview.

Safety, sensitivity and pregnancy

A slight tingling on application is normal with L-Ascorbic Acid and usually fades with continued use; persistent irritation is a reason to pause and seek advice rather than push through. The formula lists Parfum among its ingredients, so it's worth checking if you react to fragrance. If you're pregnant or breastfeeding, please contact our team for advice before use.