Effects of Topical Mandelic Acid…kin Viscoelasticity.

After 4 weeks of twice-daily mandelic acid, users saw their lower eyelid skin elasticity jump 25.4% and firmness increase 23.8%—measurable improvements that matched what they saw in the mirror. Mandelic acid is an alpha-hydroxy acid that works on acne and dark spots, and this study shows it actually does firm and bounce back aged skin, at least around the delicate eye area.