Obagi Professional-C Serum 10% Vitamin C Serum 30ml/1oz costs only $55.99 at  beautyencounter. Concentrated formula with 10% L-ascorbic acid (Vitamin C), gentle enough for dry, irritated, or sensitive skin. Helps minimize the appearance of fine lines and wrinkles.

Obagi Professional-C Serum 15% Vitamin C Serum provides superior antiixodiant protection with deep penetration. Obagi Professional-C Serum 15% is suitable for all skin types. Precaution: This is a topical solution - for external use only. Avoid direct contact with mucous membranes. Store in a dark, cool place. Keep away from children. Keep cap on tightly when not in use. Keep away from direct sunlight.