Recently polled my readers for the best vitamin C serums and the most popular responses were Biossance, Obagi, and Skinceuticals. Linked all three! You can get all three at a discount via links below.

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Squalane + Vitamin C Rose Oil | Biossance (US)
C E Ferulic® with 15% L-ascorbic acid | Vitamin C Serum | SkinCeuticals | SkinCeuticals
Obagi Medical Professional-C Serum 20% (1 fl. oz.) | Dermstore