MUA Lip & Cheek Oil – Plump It Up for Juicy Glow & pH Magic: Purple Tint with Plumping Action & Mint Flavor. The viral MUA Lip & Cheek Oil returns in a new plumping formula with a refreshing mint flavor. The Shade Plump It Up is a subtle purple tint that adapts to your skin’s pH, transforming into a rosy-purple hue upon application. Nourishment, Shine & Volume with Jojoba & Vitamin E. Its oil-like texture contains Jojoba Oil & Vitamin E, while the plumping technology stimulates circulation for fuller lips and radiant cheeks. 100% VEGAN & CRUELTY FREE.