Paula's Choice BOOST C15 Super Booster, 15% Vitamin C with Vitamin E & Ferulic Acid, Skin Brightening Serum, 0.67 Ounce

How do I know this product is authentic?
To ensure the authenticity, please make sure youÕre purchasing from PaulaÕs Choice Skincare. The authenticity of any product cannot be guaranteed when purchased from sellers other than PaulaÕs Choice Skincare.
Why does my C15 Super Booster look & smell different from the last time I purchased?
We never use irritants, colorants, dyes or fragrances which can mean a variance in color & scent between batches. Color can vary from a light yellow to a pale amber and still be completely safe & effective.
How long does the C15 Super Booster last?
C15 is best used within 3 months after opening, or 6 months if unopened. If your C15 is past its expiration, it is best to replace the product.