FAQ
Q: What is the difference between Obagi C5, C10, C20, and C25?
A: One difference is the concentration of vitamin C (a skin-brightening ingredient). The concentrations of vitamin C in Obagi C5, C10, C20, and C25 increase in that order. You can choose which one to use based on the level of concern for your skin.
Q: I feel a slight stinging sensation. Is this normal?
A: It is common for people with dry or sensitive skin to feel a slight stinging sensation when Obagi C serum penetrates the skin, but if it quickly subsides, there is no problem. However, if the skin irritation persists, please discontinue use.
The cause of the stinging sensation can vary, but if it is particularly strong, there may be a skin problem and a weakened barrier function (the ability to withstand external stimuli).
Q: The liquid color is slightly yellow when I open it or after I start using it. Can I still use it?
A: The color of the formulation can range from colorless to yellow to brown, but there is no problem with the quality of the product.
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