Obagi Professional-C Serum comes in 10%, 15% and 20% L-ascorbic acid options. The percentage refers to the vitamin C concentration. A higher number is not automatically the best choice for every skin type, and it does not replace checking tolerance, texture and the rest of your routine.
Professional-C 10%: the lower concentration
Professional-C Serum 10% is the lowest of these three strengths. It is a useful option to compare when you are new to this range or prefer to start with a lower concentration, particularly if your skin leans dry.
Lower concentration does not mean reaction-free. Read the ingredient list, follow the directions and pay attention to how your skin responds before deciding whether any change is needed.
Professional-C 15%: the middle option
Professional-C Serum 15% sits between the other two concentrations and is marketed for a broad range of skin types. It may be a practical comparison point if you already use vitamin C comfortably.
Do not choose it solely because the middle number feels like a guaranteed compromise. Existing treatments, dryness and known sensitivities are more useful considerations than a mathematical midpoint.
Professional-C 20%: the highest of the three
Professional-C Serum 20% is the highest concentration in this comparison. Consider it only with a clear reason and an understanding of your tolerance; increasing strength is not a compulsory next step.
A product you can use comfortably and consistently is more useful than one you repeatedly stop because it irritates your skin. Avoid changing concentration at the same time as adding several other active products.
Where does vitamin C go in the routine?
Follow the directions on your bottle for application to clean skin, then use moisturiser and sunscreen as appropriate. The range’s directions describe a small number of drops rather than a full pipette. Keep the product away from the eyes and do not mix it into your sunscreen.
Vitamin C serum does not provide the labelled sun protection of an SPF product. Keep sunscreen as a separate morning step even if your serum is described as an antioxidant.
What to check before changing strength
- Are you comfortable with the product you already use?
- Have you checked the ingredient list and current application instructions?
- Are acids, retinoids or prescription products already part of your routine?
- Are you seeking a cosmetic benefit that this product is intended to address?
Persistent burning, redness or irritation is a reason to stop and review the routine. It is not evidence that a higher-strength product is “working harder”. Follow professional advice where you have a skin condition or prescribed treatment.
Is Professional-C the same as an Obagi retinol?
No. This is a vitamin C serum range. Retinol products have different ingredients, directions and cautions. Our Obagi range guide helps distinguish the wider choices.
Explore Obagi at Flawless Body and check the current product page for sizes, ingredients and availability.
Product guidance: manufacturer’s information. Follow the directions on your own packaging, which may change with product updates.