Vitamin C is a staple ingredient in my skincare routine, so whenever I can get my hands on a high-end version for a fraction of the price, I pounce. Which is exactly why I'm running to shop the cult-favorite Obagi Vitamin C 20% serum ( $150; $105) while it's available for a rare markdown. That's right, you can grab the coveted formula, along with the rest of Obagi's professional-grade serums, for 30 percent off at DermStreet when you use the code TREAT30 at checkout as part of the brand's fall sale. You're welcome.

The serum is made for all skin types and claims to offer antioxidant, anti-inflammatory and anti-aging benefits that leave complexions bright and glowy. Indeed, Vitamin C in its active state (aka L-ascorbic acid) has shown promise for hyperpigmentation. C

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