What do the caffeine, grapefruit extract and vitamin E actually do on the skin?

The formula combines three types of active components, each with a different cosmetic role:

• Caffeine is a common ingredient in toning body products. Applied in a lotion, it helps the skin feel firmer and more awake at the surface level, which is why caffeine lotions are often used on thighs, arms and other areas where people want a smoother look. The effect is cosmetic and temporary — caffeine in a body milk does not change body shape or replace exercise.
• Grapefruit peel extract contributes flavonoids and vitamin C. These are antioxidant compounds that help protect the skin surface from everyday external stress and can make the skin look more refreshed and bright. The bitter orange peel extract (the "Curacao" note) adds further citrus bioflavonoids along with the fresh scent that defines this product.
• Vitamin E (tocopherol) is a classic antioxidant in skin care. Its practical role here is to help reduce moisture loss from the outer layer of the skin and give the formula a more nourishing feel while keeping the texture lightweight.

Realistic expectation: with regular use you get hydrated, softer skin with a fresher, more toned surface feel. This is a daily-care product, not a corrective treatment — noticeable effects on skin comfort and appearance come from consistent use rather than a single application.