The key ingredients of Serum Expert's 6% Caffiene Under Eye Serum (Series Z) are Salicylic Acid, Caffeine, Vitamin C, Aloe vera, Green tea and Retinol. The properties of which have been shared below. 

Reduces Puffiness and Dark Circles: The combination of caffeine and green tea extract works to diminish puffiness and minimize the appearance of dark circles, giving your eyes a refreshed appearance.

Firms and Smoothens: Vitamin C and retinol promote collagen production, helping to improve skin texture, reduce fine lines, and promote a more youthful look.

Hydrates and Nourishes: The serum is formulated to provide essential hydration and nourishment to the delicate skin around your eyes, leaving it soft and supple.