Obagi Professional-C Serum 20% – 30ml | High-Strength L-Ascorbic Acid Vitamin C Serum lemon round-cut pads designed for full

round-cut pads designed for full facial coverage

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Obagi Professional-C Serum 20% – 30ml | High-Strength L-Ascorbic Acid Vitamin C Serum lemon round-cut pads designed for fullThe strongest of Obagi's three Professional C serums 20% L ascorbic acid, for skin already comfortable with vitamin C. 30ml. What it does L ascorbic acid is the form of vitamin C with the most research behind it and the most difficult to formulate: it is unstable, acidic, and loses potency once exposed to air and light. Obagi's Professional C line exists to hold it at high concentration in a stable, low pH base where it stays active. At 20% this is