The active ingredient in the Dior Capture Youth Glow Booster Age-Delay Illuminating Serum ($95) actually comes from murunga plum, a fruit 100 times more concentrated in vitamin C than an orange. Of course, it works to brighten a complexion, but it's also fighting skin stressors like fatigue, jet lag, and (actual) stress with add-ins like antioxidant-boosting iris extract.