50 ML / 1.7 FL OZ Our results-driven serum is formulated with a unique, sustained-release retinaldehyde; a potent next-gen retinol that directly converts to retinoic acid, to address the look of fine lines and wrinkles, uneven tone and texture. Added biofermented oligopeptide actively refines the appearance of skin texture and radiance for optimal results. Looking for something stronger? Shop Retinaldehyde Cream Serum 0.10%.