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How To Minimize Oxidation of Professional-C® Serums

The Obagi Professional-C® serum contains L-ascorbic acid which is the most powerful antioxidant that works to brighten skin tone and reduce signs of skin damage. It is stored in an amber bottle and is colorless when newly opened.  After several weeks or months it gradually changes from colorless to slightly yellow, yellow, brown, and black.


Here are tips on how to minimize the oxidation of Obagi Professional-C® Serums:

1.    Keep the serum in the amber bottle. Do not decant. The amber bottle protects the serum from light that can hasten the oxidation process.




2.    Always screw the cap of the bottle air-tight.  Oxidation is faster when the serum is exposed to oxygen in the air.


3.    Store the serum in a cool dark place. It is advisable to place the serum in the refrigerator because lower temperatures keep the serum from browning easily.

Serum inside bathroom cabinet

Supercharge your glow. Consult our board-certified dermatologist about incorporating a Vitamin C Serum into your skincare routine. To book an appointment, contact our HOO Dermatology hotline at 0917 576-2326.